Hello, I have a program that evaluates mode shapes using the null space of an 8X8 matrix, "K". How do I detect empty cells in a cell array? @BenVoigt: I understand that, I was just providing what I thought were relevant documentation links :) If you want more bizarre behavior, try: A(:,min(1,end)) vs. f = @min; A(:,f(1,end)).The parser interprets end statement incorrectly here, thinking that f is an array to be indexed, even though it is a function handle.. That being said, you can effectively typecast a double array as a logical array very easily, where all nonzero values become logic 1 and all zeros logic 0: This function is useful for creating empty arrays of data types that do not have a special syntax for creating empty arrays, such as [] for double arrays. MATLAB: How to use an empty matrix in a logical if statement [] empty matrix if isempty logical operator MATLAB. Vote. The second expression involves an elementwise logical operator ( | ). Replace empty cells with logical 0's before cell2mat in MATLAB. What is the best way to replace an empty element in matrix with -1? Then, of course, you can reconvert it to a cell array with the following command: a = mat2cell(cleanedA, [1 1], [1 1]) However, for some values of "K" there is no null space, so for that "u" I get "Empty matrix: 8-by-0" and need to use a different method. While many MATLAB users will be familiar with the use of [ ] as a way of removing a row or column of a matrix (e.g., A(:,1) = []), or omitting an argument in a function call (e.g., max(A,[],2)), fewer will be aware that [ ] is just one in a whole family of empty matrices.Indeed [ ] is the 0-by-0 empty matrix 0. Commented: Image Analyst on 15 Oct 2019 I need to create an empty matrix, and I have 100 images . Note that I cannot use any and all functions to reduce Logical Arrays to Single Value, beacuse I faced with other problems when "A" array is not yet empty! Test if array is empty. It works great when the null space exists, and I get an 8X1 vector for "u". Syntax. An empty array has at least one dimension of size zero, for example, 0-by-0 or 0-by-5. tf = isempty(A) returns logical true (1) if A is an empty array and logical false (0) otherwise. To determine whether a string array has empty strings (string elements with zero characters), use the == operator. In this case, the first part of the expression, 1, is true, so the second part, after the elementwise or, is never evaluated. 2. Use ClassName.empty to create a 0-by-0 array of the ClassName class. I know the command to remove the empty cell is a(1) = [], but I can't seem to get MATLAB to automatically detect which cells are empty. Follow 1.275 views (last 30 days) ahmad Al sarairah on 14 Oct 2019. MATLAB Function Reference : isempty. let's take line 1 and line 2 in which at 2 points column 2 and column 3 the logical matrix has both 1's in row 1 and row 2 this information should be stored in 1D cell array. Empty Arrays with Logical Operators. 0. I have a program that evaluates mode shapes using the null space of an 8X8 matrix, "K". 0 ⋮ Vote. I want to create a 1D cell array based upon above matrix which should tell in which two sentences same words appear with value = 1 i.e. It works great when the null space exists, and I get an 8X1 vector for "u". So the fact that an empty result returns false never comes into play here. A simpler solution very specific to your problem is to convert the cell directly into a matrix: cleanedA = cell2mat(a); It converts to a normal matrix, and while doing this it removes the empty cells. 0 × 0 empty logical array However I need a Single Value and not logical array. Why? For example, if str is a string containing zero characters, then str == "" returns logical 1 (true).For more information on testing empty strings, see Test for Empty Strings and Missing Values.For information on string comparison, see Compare Text. 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