change only some cell values to a value of 1

Question

Conner Carriere 2022-11-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1849373-change-only-some-cell-values-to-a-value-of-1

回答： Voss 2022-11-12

I want to change all the zeros in my cell to a value of 1. I know this could be done with a for and if statement, but is there anything that is faster?

Here is my data

[0,241,638,168]
[204,181,382,287;56,0,185,244]
[0,59,574,506]
[8,58,231,546]
[28,68,375,247]
[115,82,524,510]

Want it to look like this

[1,241,638,168]
[204,181,382,287;56,1,185,244]
[1,59,574,506]
[8,58,231,546]
[28,68,375,247]
[115,82,524,510]

Would it be some sort of cellfun() function?

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Conner Carriere 2022-11-12

A(A == 0) = 1 works for arrays, but not for cells.

Conner Carriere 2022-11-12

{cat(1, a{1,1:4})} works alright once i convert it to a matrix, but then I would have to do a big for loop afterwards for each row. In the end I need a 4x1 cell with [x x x x]

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Answer 1

Voss 2022-11-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1849373-change-only-some-cell-values-to-a-value-of-1#answer_1098013

在 MATLAB Online 中打开

Yes, you can use cellfun with a helper function:

C = {
    [0,241,638,168]
    [204,181,382,287;56,0,185,244]
    [0,59,574,506]
    [8,58,231,546]
    [28,68,375,247]
    [115,82,524,510]
    };
C_new = cellfun(@zeros2ones,C,'UniformOutput',false)
C_new = 6×1 cell array
    {[ 1 241 638 168]}
    {2×4 double      }
    {[  1 59 574 506]}
    {[  8 58 231 546]}
    {[ 28 68 375 247]}
    {[115 82 524 510]}
function A = zeros2ones(A)
A(A == 0) = 1;
end