How do i check for empty cells within a list
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Andy
el 21 de Sept. de 2011
How do i check for empty cells within list? I have a list of cells, namelist, and it has 12 values, i need to check if some of the cells are empty. Thanks
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the cyclist
el 21 de Sept. de 2011
It is not clear what you mean by a "list of cells". Can you provide some code that illustrates what types of variables you are using? For example, by "cells", do you mean cell arrays?
Without more details, it is hard to answer your question, but there are functions isempty() and cellfun() that might be useful to you.
Edited in response to your comments:
>> cellfun(@isempty,namelist)
does what I think you want. For example:
namelist = cell(2,6)
namelist{1} = 'abc'
namelist{12} = 3
cellfun(@isempty,namelist)
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Jan
el 24 de Nov. de 2017
[EDITED, moved from flag to comment] LULU XUE wrote:
It's very useful!! inspiring! Thanks
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topdawgnate
el 21 de Sept. de 2011
%Build Cell array (note the curly brackets)
A{1,1} = [1 4 3; 0 5 8; 7 2 9];
A{1,2} = 'Anne Smith';
A{2,1} = 3+7i;
A{2,2} = [];
Use the isempty function
isempty(A{2,2}) %Note the difference "{" and "(" brackets
This function will return 1.
Hope this helps. Nate
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the cyclist
el 21 de Sept. de 2011
Be aware that this solution checks a single element within a cell array. My solution checks every element in the cell array individually, and reports whether each cell is empty or not. That might be more efficient, depending on your application.
Korosh Agha Mohammad Ghasemi
el 25 de Jun. de 2024
Movida: Voss
el 25 de Jun. de 2024
To check for empty cells within a cell array in MATLAB, you can use the cellfun function combined with isempty. This approach is efficient and straightforward. Here’s how you can do it:
% Example cell array
namelist = {'John', [], 'Alice', 'Bob', [], 'Eve', 'Charlie', [], 'Dave', [], 'Frank', 'Grace'};
% Use cellfun with isempty to find empty cells
emptyCells = cellfun(@isempty, namelist);
% Display the indices of empty cells
emptyIndices = find(emptyCells);
disp('Empty cell indices:');
disp(emptyIndices);
This code will create a logical array emptyCells where each element is true if the corresponding cell in namelist is empty and false otherwise. The find function then returns the indices of the empty cells.
If you prefer a faster implementation, especially for large cell arrays, you can use the string form of cellfun:
emptyCells = cellfun('isempty', namelist);
emptyIndices = find(emptyCells);
disp('Empty cell indices:');
disp(emptyIndices);
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