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Find index of first empty cell in an array row

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Ahmad Mahmoud
Ahmad Mahmoud 2018-7-3
编辑： Jan 2020-12-1
I have a cell with strings and matrices. I want to add data after the last cell with data in a row.
A = {['apple'] [3x2 double] ; ['banana'] []}
For example, I want to add a matrix after the 3x2 matrix in first row, or after the 'banana' in second row.
I tried using:
find(cellfun(@isempty,A{1,:}),1)
But I get the error:
Error using cellfun
Input #3 expected to be a cell array, was double instead.

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采纳的回答

Hermes Suen
Hermes Suen 2018-7-3
The error you are receiving seems to be because you are using curly braces after A.
A{1,:}
When you use curly braces with a cell array, you access the actual contents of what is within the cell array. So if you have a cell array of char vectors and doubles, for example:
A = {'Banana', 560}
A{1}
A{1} will yield only the char vector 'Banana'. A{2} will yield a double, 560. But the cell argument into cellfun, must be an actual Cell array, not the contents of that cell array. I suggest using regular parenthesis to index the cell array A.
A(1)
This will yield a another Cell array of length 1 that is a subset of A.

更多回答（1 个）

Jan
Jan 2018-7-4
编辑：Jan 2020-12-1
A = {'apple', rand(2, 3); 'banana', []};
find(cellfun('isempty', A),1)
Note: Using the cellfun method 'isempty' is faster that providing a function handles @isempty.
There is no need to enclose a CHAR in square brackets. This wastes time only.

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