How to replace all the ones in a matrix with the string 'hey'?

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oshawcole
oshawcole 2017-12-4
评论： Walter Roberson 2017-12-6
matrix= [1 0 0.1 0.001 4; 5.9 2.1 3.15 8.95 1.11]
All the ones should be replaced with 'hey'
This is my code
matrix= [1 0 0.1 0.001 4; 5.9 2.1 3.15 8.95 1.11];
matrix= num2str(matrix);
matrix(matrix=='1') = 'h'
when I replace 'h' with 'hey' it gives me this error
matrix(matrix=='1') = 'hey'
I have just started to learn MATLAB. please help

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采纳的回答

Walter Roberson
Walter Roberson 2017-12-5
newmatrix = num2cell(matrix);
newmatrix(matrix == 1) = {'hey'};
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oshawcole
oshawcole 2017-12-6
is there a way to get it displayed as a matrix?
matrix= [1 0 -1 0.001 4; 5.9 -1 3.15 1 1.11 ];
cell_conv = (num2cell(matrix));
find_one = abs( matrix ) == 1 ;
cell_conv(find_one)={'hey'}
this is what I found? i just want to put this together in one line.
Walter Roberson
Walter Roberson 2017-12-6
It is possible to do in one line, but it gets so messy that it is not recommended.
Here is a way to do it with the assistance of a helper function.
IDXAT = @(M,IDX) M(IDX);
disp(IDXAT(cat(3,num2cell(matrix),repmat({'hey'},size(matrix))), reshape(1:numel(matrix), size(matrix))+numel(matrix)*(abs(matrix)==1)))
The output would look like
'hey' [ 0] 'hey' [0.001] [ 4]
[5.9] 'hey' [3.15] 'hey' [1.11]
I am not sure that is acceptable to you.

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更多回答（1 个）

John D'Errico
John D'Errico 2017-12-4
You can't. A matrix is composed of numbers. You cannot insert a string for some elements, replacing an arbitrary numeric element.

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