If statement for matrix

Question

Sewwandhi Chandrasekara 2022-4-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1688189-if-statement-for-matrix

编辑： DGM 2022-4-5

I have a matrix of 73 rows andd 12 columns having different values to each cell. I want to assign if cell value=0.5 display "0, else if cell value >=0.5 display "+1" else cell value<=0.5 display "-1". I tried following, but gives only one value.1,1 cell value is -0.5438.

if B==0.5;

disp='0';

elseif B>=0.5;

disp='+1';

else

disp='-1'

end

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Answer 1

DGM 2022-4-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1688189-if-statement-for-matrix#answer_934824

编辑：DGM 2022-4-5

在 MATLAB Online 中打开

If you want to change array values, why are you using disp()?

This will produce the output of the same size:

A = rand(4,3); % a test array
A(1) = 0.5 % make sure at least one is exactly 0.5
A = 4×3
    0.5000    0.4352    0.4317
    0.2511    0.4596    0.8072
    0.9170    0.0056    0.6738
    0.1956    0.2177    0.4465
B = sign(A-0.5) % simple numeric output
B = 4×3
     0    -1    -1
    -1    -1     1
     1    -1     1
    -1    -1    -1

If for some reason, you want a bunch of text output:

cmap = {'-1','0','+1'};
Btext = cmap(sign(A-0.5)+2) % cellchar output
Btext = 4×3 cell array
    {'0' }    {'-1'}    {'-1'}
    {'-1'}    {'-1'}    {'+1'}
    {'+1'}    {'-1'}    {'+1'}
    {'-1'}    {'-1'}    {'-1'}