find a vector in a cell array

Question

Elysi Cochin 2019-4-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458909-find-a-vector-in-a-cell-array

评论： Walter Roberson 2019-4-27

AP = {[1,2,14];[1,5,14]}
P = {[1,5,14]};

i wanted to check if P is in AP

i did as

IsInAp = find(cellfun(@(x) ismember(path,x,'rows'),allpaths));

but showing error as

Warning: The 'rows' input is not supported for cell array inputs. 
> In cellismemberlegacy (line 47)
  In cell/ismember (line 91)
  In Untitled>@(x)ismember(path,x,'rows')
  In Untitled (line 40) 
Error using cell/ismember (line 34)
Input A of class cell and input B of class double must be cell arrays of character vectors,
unless one is a character vector.
Error in cellismemberlegacy (line 53)
        [lia,locb] = ismember(a,b);
Error in cell/ismember (line 91)
        lia = cellismemberlegacy(a,b,flag1);
Error in Untitled>@(x)ismember(path,x,'rows')
Error in Untitled (line 40)
    IsInAp = find(cellfun(@(x) ismember(P,x,'rows'),AP));

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Answer 1

Walter Roberson 2019-4-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458909-find-a-vector-in-a-cell-array#answer_372581

在 MATLAB Online 中打开

any(cellfun(@isequal,AP(:),repmat(P,length(AP),1)))

This does not require that the elements of AP be the same length or that P and AP contain row vectors (but does require they be the same orientation.)

You could also use

ismember(P{1}, cell2mat(AP(:)), 'rows')

which does assume that elements of AP are the same length and that P and AP contain row vectors.