I prepare an array as input for ``pca ()`` with ``m``*n columns (``m``< 32768; its a subset of all the observed bits, as the original data might be too big for pca) and 4 rows (one row for each device). Conditions are expressed in terms of a comparison of two quantities by applying one or more of the following relational operators: > greater than Affordable solution to train a team and make them project ready. Reset the random number generator to the default state for reproducibility. Example 2: Matlab. MATLAB returns an array that matches the elements of the array X, element-by-element holding 1s where the matching values in X are the desired values, and 0s otherwise. I will take that job if they give me a raise over my current salary OR they give me a bigger office. By default, MATLAB creates integer arrays as double precision arrays. Matlab operates on whole arrays and matrices hence, Matlab functions work on non-scalar and scalar data. Learn more, Data Preprocessing for Machine Learning using MATLAB. This enables the reduction of many logical values into a single logical condition. Maybe PCA is not the right approach for this problem? is an m-by-n-by-p-by- array of logical ones. Next, use the mod function along with the logical NOT operator, ~, to determine which elements in A are even. Logical exclusive-OR; performs an exclusive OR operation on the corresponding elements of arrays A and B. I would like to obtain vec3 such that it contains 1 in a specific row if either vec1 or vec2 contain 1. Since the relational operator has a higher precedence than the boolean operator, no parentheses are needed. In other cases, it may be based on one of several conditions being true. Output v contains the non-zero elements of the logical array obtained by evaluating the expression X. MATLAB offers two types of logical operators and functions . That is. It display "Array indices must be positive integers or logical values". If X contains no nonzero elements or is an empty array, then an empty array is returned. Use L as a logical index to pick out the odd elements of A. We make use of First and third party cookies to improve our user experience. If vectors are all the same length, working with logical arrays will be easier & faster. The array logInd is not an array of double numbers, but have the class logical. Determine if all elements in A are odd. Most arithmetic operations involving logical arrays Sum two arrays using logical indices. more information, see Run MATLAB Functions in Thread-Based Environment. < less than Decision-making in computer programs is typically driven by logical comparisons: one action is performed if a condition is true, while another is performed if it is false. Based on The any function ignores entries that are NaN (Not a Number). array. The matlab equality operators compares array element-wise and returns true/false (logical 1/0) for each element. Use the logical NOT operator, ~, on L to find the even elements of A. I presume, this for loop is present inside another loop, thats why result flag is being set to false again. The size of this dimension reduces to 1 while the sizes of all other dimensions remain the same. This technique, logical indexing, is typically used in conjunction with a relational operator to choose the elements of an array that meet a certain condition. is an array of logical zeros that is the same size as array A. is an array of logical zeros of the same data type and sparsity as the logical array p. Find indices and values of nonzero elements; locates all nonzero elements of array X, and returns the linear indices of those elements in a vector. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. The output is a logical output. I seems its reading the arrays as if they are empty as they are only defined within the function. Sorry if that wasn't clear. and functions like any, all, isnan, isinf, The symbols |, & and ~ are the . Matlab stores matrices using column major layout. % x is an array, I believe of dimension (R, 2) % I understand that the following line creates a logical array y of the same % dimensions as x in which every position that has a number (i.e. So when you have A = [1 1 0 0], B = [1 0 1 0] and you check for A == B, you don't get 'false' but instead you get [1 0 0 1]. == is equal Element-wise these operators operate on corresponding elements of logical arrays. Logical arrays also are created by the relational operators ( ==, <, >, ~ , etc.) It sounds like time_0 is a cell. yes you're correct,but i 'am still facing a problem to put this into code. Is there a reason why you are using cell arrays in the first place? . combing two arrays into a table (app. Hey guys, does anyone know whats wrong. In many cases, it is useful to evaluate two or more conditions simultaneously; boolean operators (and, or and not) are used in conjunction with relationals to evaluate more complex conditions. If vectors are all the same length, working with logical arrays will be easier & faster. If A is an empty 0-by-0 matrix, all(A) returns logical 1 (true). Determine if all elements in A are odd. The last 3 elements are logical 1 (true), since the corresponding elements of A are greater than 4. Start Hunting! what my intension is, I want to subtract two matrices which are not of the same order though. This data type represents true and false states using the numbers 1 and 0, respectively. One option is to continue using cellfun for this, as follows: fun_stf = cellfun (@ (x,y) ~x & ~y,fun_stf_p,fun_stf_s) Another option is to convert to a double and then back again. Arithmetic Operators Returns a column or row vector v of the nonzero entries in X, as well as row and column indices. 1. If A is a nonempty matrix, all(A) treats the columns of A as vectors, returning a row vector of logical 1's and 0's. Learn more about app designer, initialisng, app., matlab, fft MATLAB So in this array you have you two dimensional Matlab code and vectorize Matlab. The array RATN is a 6X10 array that is used in the calculation of C1-4. fun_stf = cellfun (@ (x,y) ~x & ~y,fun_stf_p,fun_stf_s) Another option is to convert to a double and then back again. Multiple relational operators can be combined with boolean operators to determine which elements of an array meet a complex condition. Generate C and C++ code using MATLAB Coder. Combining two logical vectors - MATLAB Answers - MATLAB Central Combining two logical vectors Follow 227 views (last 30 days) Show older comments Stephen on 5 Apr 2016 Vote 2 Link Edited: Azzi Abdelmalek on 5 Apr 2016 Accepted Answer: Kuifeng Dear All, I have 2 logical vectors: Theme Copy vec1 = false (5,1); vec1 (1,1)=1; %vec1 = [1 0 0 0 0]'; returns at most the last k indices corresponding to the nonzero entries of X. I would like to compare two logical cell arrays, creating a third logical cell array returning true for when index values of both logical cell arrays are true. result in a conversion error. information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox). On this array ``A`` I calculate the pca: `` [coeff score latent] = pca (zscore (A))```. Based on The number 1 can be replaced by any positive integer, n, to determine the first or last n occurrences. 4. <= less than or equal to Instead, I created a vector, which holds the indices where there is a '1' in the original measurement array. Choose a web site to get translated content where available and see local events and The array has logical 1 ( true) values where A is odd. MATLAB offers two types of logical operators and functions Element-wise these operators operate on corresponding elements of logical arrays. It is common to make decisions this way in everyday life, as in these examples: In the first example, both conditions have to be true for the decision to be taken. Find the treasures in MATLAB Central and discover how the community can help you! For example: Although these two expressions are mathematically equal, their digital representations are slightly different. offers. Because of the finite precision with which numbers are stored in a computer, roundoff error will often cause values that should be equal to be unequal. I will go to see Top Gun: Maverick tomorrow if it is showing in the IMAX theater AND there are tickets available for the 7:00 show. If X is a row vector, then the returned vector is a row vector; otherwise, it returns a column vector. Extended Capabilities Tall Arrays You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Otherwise, the array element is set to 0. fun_stf_s = cellfun(@(x) x >= stf_s_lb & x <= stf_s_ub, PSAL, % Create a third logical cell array for which both cell arrays return true, Why do you have logical cell arrays in the first place? MathWorks is the leading developer of mathematical computing software for engineers and scientists. % numbers given by the user. Examples your location, we recommend that you select: . Suppose there are two arrays containing daily high temperatures and precipitation levels. The size of this dimension reduces to 1 while the sizes of all other dimensions remain the same. If A is a multidimensional array, any(A) acts along the first non-singleton dimension and returns an array of logical values. I would like to exit a loop if the result is set to true in the for loop. This function fully supports tall arrays. It also returns true if A is an instance of a class that is derived from the logical class. Logical arrays also are created by the relational Find an error? Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char. Notice the output of whos (there was no Workspace Browser yet). Logical arrays can be 3D just like any other Matlab array (except tables and 2D sparse matrices). So the element at row 1 column 2 is, in fact, the fifth element stored. and returns an array containing elements set to either logical 1 (true) or logical 0 (false). sites are not optimized for visits from your location. >> abs(lhs - rhs) < tolerance. Logical indexing is used to extract the values of an array that meet a certain condition. Fundamentally, find() returns the indices of all non-zero elements in an array. sites are not optimized for visits from your location. Do you want to open this example with your edits? Can you g. The find() function is useful for this type of analysis. But it always returns false if I use 'continue'. Create a script file and type the following code , When you run the file, it produces following result , Apart from the above-mentioned logical operators, MATLAB provides the following commands or functions used for the same purpose . For % the two different logical arrays produced by cellfun: fun_stf_p = cellfun (@ (x) x >= stf_p_lb & x <= stf_p_ub, PRES, 'UniformOutput', false); fun_stf_s = cellfun (@ (x) x >= stf_s_lb & x <= stf_s_ub, PSAL, 'UniformOutput', false); % Create a third logical cell array for which both cell arrays return true The first 3 elements of the resulting logical array are logical 0 (false), since the first 3 elements of A are not greater than 4. I only want it to return logical true when they both satisfy the conditions and return logical true. Convert numeric values to logical; returns an array that can be used for logical indexing or logical tests. For example, let's create a two-dimensional array a. . If you want to check if the whole vectors A and B are equal you need to check if the condition all (A==B . Different Types of Operators There are different types of Matlab operators. If A is a vector, all(A) returns logical 1 (true) if all the elements are nonzero and returns logical 0 (false) if one or more elements are zero. Suppose there are two arrays containing daily high temperatures and precipitation levels. ans = logical 1 You can perform logical and relational comparisons within the function call to any or all. I'm guessing this would be x==1 & y==1 instead of ~x & ~y, which seems to be working, You may receive emails, depending on your. This makes it easy to quickly test an array for a variety of properties. I would like to create a 6x10 array for each C1 , C2 , C3 , and C4 based on the index value in which if RATN is greater than 0.1 but less than 2.0 a value is calculated from one equation, but if the value is greater than 2 the value is calculated from a different equation. Edited: Imraan Ibrahim about 8 hours ago. The way computers do that is by making comparisons, such as Is this variable greater than that one? or Is this variable equal to a certain value? The operators that perform these comparisons are called relational operators. MATLAB Programming for Engineering Applications Copyright by James Toney and jayakumar5. Other MathWorks country sites are not optimized for visits from your location. Otherwise, that element is set to 0. The resulting element C(i,j,) is logical true (1) if A(i,j,) or B(i,j,), but not both, is nonzero. Multidimensional arrays in MATLAB are an extension of the normal two-dimensional matrix. It enables operator overloading for classes. more information, see Tall Arrays. num1 = input ('Enter the first number:- '); num2 = input ('Enter the second number:- '); Use the logical NOT operator, ~, on L to find the even elements of A. If A is a vector, any(A) returns logical 1 (true) if any of the elements of A is a nonzero number or is logical 1 (true), and returns logical 0 (false) if all the elements are zero. This means the 2d matrix: A = 1 2 3 4 5 6 7 8 9 is stored in memory as one dimensional array going down the columns of A: A = { array = [1 4 7 2 5 8 3 6 9] n_rows = 3 n_cols = 3 } The matrix B: B = 0 1 0 1 0 1 is stored in memory as: B = { array = [0 1 1 0 0 1] n_rows = 2 n_cols = 3 } If they have to be the same length (which they do for you to compare them element by element) and they are both logical then why not just put them in a logical array and use. converted to logical 1 (true) You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Now we are going to use the logical operators in conditional statements. Start Hunting . I am trying to apply a function to an big array. Learn more about how Pressbooks supports open publishing practices. Show Hide 1 older comment. time_0 should to be positive integers or logical values. A (~L) ans = 31 -8 4 2 Input Arguments collapse all A Input array A = [2 4; 5 -2; 4 8] Explanation: Suppose we need to create a 2D array that is size 2 by 2. By using this website, you agree with our Cookies Policy. Logical indexing can also be used between two arrays, provided that they have the same dimensions. Have a suggestion for improvement? Follow 5 views (last 30 days) Show older comments. In some cases, it is useful to know the indices of the elements that meet the condition. To pick out the high temperatures on the days when it rained or snowed: >> temperature = [41, 37, 28, 23, 36, 44, 50]; If you use outside the if condition the result state may not be saved to true if this for loop is nested inside another loop which means it will restore the result state back to false. https://www.mathworks.com/matlabcentral/answers/277297-combining-two-logical-vectors, https://www.mathworks.com/matlabcentral/answers/277297-combining-two-logical-vectors#answer_216550. all (~A (:)) ans = logical 0 Determine whether any main or super diagonal elements in A are even. >= greater than or equal to Most arithmetic operations involving logical arrays return double values. returns a double array. I'm assuming that time_0 is a cell containing an array of indices. An array having more than two dimensions is called a multidimensional array in MATLAB. For a computer program to have intelligence, it must be able to make decisions. Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder. Based on your location, we recommend that you select: . An element of the output array is set to 1 if any input arrays contain a nonzero element at that same array location. % the two different logical arrays produced by cellfun: fun_stf_p = cellfun(@(x) x >= stf_p_lb & x <= stf_p_ub, PRES. your location, we recommend that you select: . 7. Logical operators and many appropriate functions produced outputs that were marked as logical, and only index arrays that had this logical attribute would cause logical indexing to be used. not Nan) % contains True. Element-wise logical operators operate by taking single element at a time of logical arrays. For example, to determine the last day when the temperature was below freezing: >>last_freeze = find (temperature < 32, 1, 'last'). offers. Learn more about for loop MATLAB. Web browsers do not support MATLAB commands. The result is a vector containing all odd elements of A. Otherwise, that element is set to 0. Returns at most the first k indices corresponding to the nonzero entries of X. k must be a positive integer, but it can be of any numeric data type. For example, to determine which elements of A are between 5 and 9, inclusive: >> first6_presidents = ["Washington", "Adams", "Jefferson", "Madison", "Monroe", "Adams"]; >> is_Adams = first6_presidents == "Adams". Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox. A (L) ans = 61 1 5 -3 1 7 3 The result is a vector containing all odd elements of A. This code returns logical true for when both cells are 0 or 1. A powerful technique for analyzing data arrays is to use a logical array as an index; this picks out the values of the data array for which the logical array is true. How do I exit a for loop after logical index is found true in an array? I'm guessing this would be x==1 & y==1 instead of ~x & ~y, which seems . In MATLAB and other programming languages, these kinds of compound conditions are implemented using boolean operators: When a relational operator is applied to an array, the result is a logical array an array of true/false values (also called logical 1 / logical 0). Finds logical NOT of array or scalar input; performs a logical NOT of input array A and returns an array containing elements set to either logical 1 (true) or logical 0 (false). Unable to complete the action because of changes made to the page. MathWorks is the leading developer of mathematical computing software for engineers and scientists. In the second, if either or both conditions are true, the decision is taken. If vectors are all the same length, working with logical arrays will be easier & faster. The next chapter discusses use of relational and boolean expressions with the if statement to make decisions (branching) in a program. Accelerating the pace of engineering and science. Branching & Looping II - Complex Programs. Tests along the dimension of A specified by scalar dim. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox). Learn more about sum, logical, array MATLAB Find the treasures in MATLAB Central and discover how the community can help you! ans = logical 1 You can perform logical and relational comparisons within the function call to any or all. Reload the page to see its updated state. Unable to complete the action because of changes made to the page. The symbols &, |, and ~ are the logical array operators AND, OR, and NOT. return double values. ~= is not equal. Logical indexing can also be used between two arrays, provided that they have the same dimensions. is an array of logical ones that is the same size as array A. is an array of logical ones of the same data type and sparsity as the logical array p. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. L = logical(A) converts A into MathWorks is the leading developer of mathematical computing software for engineers and scientists. For example, in the previous example, we may want to determine the days when the high temperature was below freezing. But once I run it on appdesigner. For example, if these commands are executed: >> A_gt_4 = A > 4 %Are the elements of A greater than 4? Thanks for your answer! Short-circuit these operators operate on scalar, logical expressions. Let's see the very basic example of a 2D array as follows. This is possible because MATLAB arrays are stored column wise in memory. Learn more about sum, logical, array MATLAB and zeros are converted to logical 0 (false). I checked that this arrayfunction is working for me. Determine if input is logical array; returns true if A is a logical array and false otherwise. But since my matrix is binary, I am hoping that there is a way to create an array of bits instead of doubles and consume far less memory. hi guys, How can i create a logical array [1 0 1 0 1 1 ..] 1-by-15 it will go into gamultiobj with bitstring so the the arranging is not important. Pick out the odd-numbered elements of a numeric matrix. % apply function to 'input_data.id' array logicalOutput = arr. and isfinite. MATLAB represents Boolean data using the logical data type. This function fully supports distributed arrays. Finds logical OR of array or scalar inputs; performs a logical OR of all input arrays A, B, etc. Choose a web site to get translated content where available and see local events and Short-circuit these operators operate/work on scalar, logical expressions. 3. For example, adding zero to a logical array returns a double array. I have tried the if condition and catch method but the app just returns an empty table. At that time we can use the above statement to create the 2D array. I will go cycling this afternoon if it does NOT rain. whos logInd Name Size Bytes Class Attributes logInd 1x20 20 logical If X is an N-dimensional array with N > 2, col contains linear indices for the columns. Here's a screen shot from MATLAB 5.1 in 1997 showing this new form of logical indexing. I also modified the input data to do the PCA not on the logical bit array itself. etc.) Determine if all array elements of array A are nonzero or true. Both cell arrays are a series of double arrays which match in dimension between the cell arrays, but change size within the cell array. Certain MATLAB functions and operators return logical values to indicate fulfillment of a condition. For more Generate CUDA code for NVIDIA GPUs using GPU Coder. Reload the page to see its updated state. This makes it easy to quickly test an array for a variety of properties. I already have my line code working. For A & B performs a logical AND of arrays A and B and returns an array containing elements set to either logical 1 (true) or logical 0 (false).An element of the output array is set to logical 1 (true) if both A and B contain a nonzero element at that same array location.Otherwise, the array element is set to 0. I have been unsuccessfully trying to use union or setxor Thank you for your help, You may receive emails, depending on your. For bit-wise logical AND operations, see bitand. Learn more about logical array . Run MATLAB Functions in Thread-Based Environment, Run MATLAB Functions with Distributed Arrays, Find Array Elements That Meet a Condition. Sum two arrays using logical indices. type of logic? . and (A,B) is an alternate way to execute A & B, but is rarely used. This can be seen by calculating the difference: The usual practice with floating-point numbers is to set a tolerance and regard any value less than that tolerance as zero: >> tolerance = 1.0e-9; 2. Struggling in MATLAB 9 minutos ago. This function fully supports GPU arrays. Use L as a logical index to pick out the odd elements of A. % MATLAB script is used to determine. Accelerating the pace of engineering and science. 0. The result of applying one of these operators is either true (logical 1) or false (logical 0). Agree is an m-by-n-by-p-by- array of logical zeros. and functions like any, all, isnan, isinf , and isfinite. First, create a matrix A that contains random integers between 1 and 25. Choose a web site to get translated content where available and see local events and offers. Copy. To pick out the high temperatures on the days when it rained or snowed: >> temperature = [41, 37, 28, 23, 36, 44, 50]; >> precipitation = [0, 0, 1.2, 0.3, 0, 2.5, 0.3]; >> temp_wet_days = temperature (precipitation > 0). Element-wise logical operators operate element-by-element on logical arrays. Find the treasures in MATLAB Central and discover how the community can help you! Learn more about app designer, initialisng, app., matlab, fft MATLAB Otherwise, that element is set to 0. Accelerating the pace of engineering and science. Is there a reason why you are using cell arrays in the first place? an array of logical values. Now let's see the different examples of 2D arrays in Matlab for better understanding as follows. https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays, https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays#comment_712216, https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays#comment_712228, https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays#answer_378122, https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays#comment_712227, https://www.mathworks.com/matlabcentral/answers/465843-how-to-compare-two-logical-arrays#comment_712237. One option is to continue using cellfun for this, as follows: fun_stf = cellfun(@(x,y) ~x & ~y,fun_stf_p,fun_stf_s). Complex values and NaNs cannot be converted to logical values and In other words, each column in the array is stored one after another. Please submit this survey. Input array, specified as a scalar, vector, matrix, or multidimensional MATLAB provide two types of logical operators: Element-wise these operators operate/work on corresponding elements of logical arrays. If A is a multidimensional array, all(A) acts along the first non-singleton dimension and returns an array of logical values. Find the modulus, mod(A,2), and convert it to a logical array for indexing. If A is an empty 0-by-0 matrix, any(A) returns logical 0 (false). Other MathWorks country operators (==,<,>,~, Short-circuit these operators operate on scalar, logical expressions. It is often used in conjunction with a logical array to find the indices of the elements that satisfy a condition. combing two arrays into a table (app. An element of the output array is set to 1 if all input arrays contain a nonzero element at that same array location. The array has logical 1 (true) values where A is odd. Arithmetic operators Relational operators Logical operators Bitwise operators Set operators 1. Calculate with arrays that have more rows than fit in memory. Example of Matlab 2D Array. Is there a reason why you are using cell arrays in the first place? In the vectorized file you find a you can try these outand stringBd file and you have the stringFile object that is provided for this Bb file. y=~isnan (x) for k=1:R % I don't know if z has been previously defined. Both cell arrays are a series of double arrays which match in dimension between the cell arrays, but change size within the cell array. Can't find it anywhere % in the code I've been given. Element-wise logical operators operate element-by-element on logical arrays. and returns an array containing elements set to either logical 1 (true) or logical 0 (false). all (~A (:)) ans = logical 0 Determine whether any main or super diagonal elements in A are even. For bit-wise logical AND operations, see bitand. If that is the case, you can try something like: Theme. All Rights Reserved. Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox. Vote. Replace 'last' with 'first' to determine the first occurrence of the condition. The same technique can be applied to character or string arrays, as in these examples: MATLAB Programming for Engineering Applications, at least one of the conditions must be true. . Determine if any array elements are nonzero; tests whether any of the elements along various dimensions of an array is a nonzero number or is logical 1 (true). position_0 {tr} = pos ( [time_0 {:}]); Sign in to comment. The result of relational operations can be stored in a variable for later reference: It is a bad practice to apply the equality operator (==) to expressions involving floating-point numbers. We can use logical arrays such as this to perform logical indexing such as set the elements of A where A is less than 0.5 to . Any nonzero element of A is This chapter introduces the concepts of relational and boolean operations and shows how they are applied to arrays. If A is a nonempty matrix, any(A) treats the columns of A as vectors, returning a row vector of logical 1's and 0's. Undefined unary operator '~' for input arguments of type 'cell'. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. In some cases, a decision is based on multiple conditions being true simultaneously. An element of the output array is set to 1 if the input array contains a zero value element at that same array location. Short-circuit logical operators allow short-circuiting on logical operations. Surely you don't need the 'UniformOutput', 'false' if the two arrays fulfil those criteria. Generally to generate a multidimensional array, we first create a two-dimensional array and extend it. If X is a logical expression, then v is a logical array. Want to create or adapt books like this? You can use those logical values to index into an array or execute conditional code. Finds logical AND of array or scalar inputs; performs a logical AND of all input arrays A, B, etc. An element of the output array is set to logical 1 ( true) if both A and B contain a nonzero element at that same array location. This function fully supports thread-based environments. The symbols && and || are the logical short-circuit operators AND and OR. You can use volshow to get a 3D rendering, though you may be asked to set your opengl settings to hardware-based in order for it to work. Find the treasures in MATLAB Central and discover how the community can help you! The find() function can also return the index of the first or last occurrence(s) of a condition. You have two similar Matlab files and you make this array equal to 3 bytes vector by the calculation. >> freezing_days = find(temperature < 32). Returns the row and column indices of the nonzero entries in the matrix X. This tells us that the 3rd and 4th days had sub-freezing high temperatures. For example, suppose you want to take the average of only the positive numbers in an array: The expression X (X > 0) picks out only those elements of X that meet the condition, X > 0. This syntax is especially useful when working with sparse matrices. 2 Comments. Live Demo Other MathWorks country Thank you for your response! Another option is to convert to a double and then back again. You have a modified version of this example. I created a random binary matrix A and converted it to a logical array B: A = randi ( [0 1], 1000, 1000); B=logical (A); % the nature of the product (positive, % negative or zero) of the two. For example, adding zero to a logical array my first matrix T is of order 101 by 101 and the other one A is 1001 by 1001 and i want the resultant matrix E_epsilon to be of order 101 by 101. 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