seach string in arraycell and find idx

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piero
piero 2023-9-18
回答： David Hill 2023-9-18
Ran in:
C = {'A',31;
'B',5;
'C',3}
C = 3×2 cell array
{'A'} {[31]} {'B'} {[ 5]} {'C'} {[ 3]}
idx = find(ismember(C,{'A'}))
Error using cell/ismember
Input A of class cell and input B of class cell must be cell arrays of character vectors, unless one is a character vector.

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采纳的回答

David Hill
David Hill 2023-9-18
Ran in:
C = {'A',31;
'B',5;
'C',3};
idx = find(ismember(C(:,1),{'A'}))
idx = 1

更多回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-9-18
Ran in:
When using ismember, if any of the input is a Cell array, it is expected that it will be a cell array of character vectors.
> which is what the error states
> which is mentioned in the documentation as well - Input Arguments for ismember()
But C is not a homogenueous cell array of character vectors, it has numeric data as well. So the above code does not work.
Use (the more robust) strcmp instead -
C = {'A',31;
'B',5;
'C',3}
C = 3×2 cell array
{'A'} {[31]} {'B'} {[ 5]} {'C'} {[ 3]}
%Comparing with cell array of character vector
idx = find(strcmp(C,{'A'}))
idx = 1
%Comparing with character
idx = find(strcmp(C,'A'))
idx = 1
%Comparing with string
idx = find(strcmp(C,"A"))
idx = 1

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