Replace number with text

Question

stelios loizidis 2021-9-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1459194-replace-number-with-text

回答： Walter Roberson 2021-9-23

Hello, I have the following problem. I have a matrix A which has dimensions of 300x350. In this matrix I want to replace the value 5 with the phrase "NO". I wrote a small code but it does not replace. I attach the code.

% finding positions of number 5 from table A. 
[i1,k1]=find(A==5);
% Replace value 5 with text "NO"
for i=1:length(i1)
    for j=1:length(k1)
        if A==5
A(i1(i),k1(j))=disp('NO');
    end
    end
end

Your help is invaluable.

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Chunru 2021-9-23

编辑：Chunru 2021-9-23

Matrix or array in matlab must have the same data type. You can not mix the double data with a string 'NO' in same matrix.

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Answer 1

KSSV 2021-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/1459194-replace-number-with-text#answer_793519

编辑：KSSV 2021-9-23

在 MATLAB Online 中打开

Instead of a string, you can try replacing it with NaN.

% finding positions of number 5 from table A. 
[i1,k1]=find(A==5);
% Replace value 5 with text "NO"
for i=1:length(i1)
    for j=1:length(k1)
        if A==5
            A(i1(i),k1(j))=NaN ; 
    end
    end
end

Also you need not tuse a loop.

idx = A == 5 ; 
A(idx) = NaN ;

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stelios loizidis 2021-9-23

It works!!!!

Thanks for the valuable help.

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Answer 2

Walter Roberson 2021-9-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1459194-replace-number-with-text#answer_793529

在 MATLAB Online 中打开

Adjust to suit

A = magic(7);
newA = num2cell(A);
mask = mod(A,5) == 0;
newA(mask) = {'NO'};
newA
newA = 7×7 cell array
    {'NO'}    {[39]}    {[48]}    {[ 1]}    {'NO'}    {[19]}    {[28]}
    {[38]}    {[47]}    {[ 7]}    {[ 9]}    {[18]}    {[27]}    {[29]}
    {[46]}    {[ 6]}    {[ 8]}    {[17]}    {[26]}    {'NO'}    {[37]}
    {'NO'}    {[14]}    {[16]}    {'NO'}    {[34]}    {[36]}    {'NO'}
    {[13]}    {'NO'}    {[24]}    {[33]}    {[42]}    {[44]}    {[ 4]}
    {[21]}    {[23]}    {[32]}    {[41]}    {[43]}    {[ 3]}    {[12]}
    {[22]}    {[31]}    {'NO'}    {[49]}    {[ 2]}    {[11]}    {'NO'}