How can I use the output of "sprintf" to read the content of a matrix

Question

Saad 2013-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/108284-how-can-i-use-the-output-of-sprintf-to-read-the-content-of-a-matrix

编辑： Jos (10584) 2013-12-3

Dear all,

I am trying to use a loop to read into different matrices which are: results_USA, results_UK, results_JAP and results_UK. I am trying to do it with a loop using sprintf

%% here is my code

c={'USA','EUR','JAP','UK'};

for j=1:length(c)

for i=0:10

   AA=sprintf('results_%s',c{j})
 [zMin,idx]=min(AA(:,i+1:i+5),[],2);
end

end

%% my problem is that matlab tells me that there is a dimension mismatch because it does not recognize the size of AA even though I set AA equal to "results_USA", "results_UK", "results_JAP" or "results_EUR".

I would like to use the output sprintf('results_%s',c{j}) without having to rename the matrix "results_USA" (i.e. i would like Matlab to recognize the name of the matrix it reads)

Thank you very much for your help

S

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Answer 1

sixwwwwww 2013-12-2

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在 MATLAB Online 中打开

Dear Saad, if i understood correctly you need to do something like this:

c={'USA','EUR','JAP','UK'};
results_USA = rand(15);
results_EUR = rand(15);
results_JAP = rand(15);
results_UK = rand(15);
for j=1:length(c)
    for i=0:10
        AA = sprintf('results_%s',c{j});
        switch AA
            case 'results_USA'
                [zMin,idx]=min(results_USA(:, i+1:i+5),[],2);
            case 'results_EUR'
                [zMin,idx]=min(results_EUR(:, i+1:i+5),[],2);
            case 'results_JAP'
                [zMin,idx]=min(results_JAP(:, i+1:i+5),[],2);
            case 'results_UK'
                [zMin,idx]=min(results_UK(:, i+1:i+5),[],2);
        end
    end
end

Is it what you need?

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Saad 2013-12-3

thank you very much !!

Jos (10584) 2013-12-3

在 MATLAB Online 中打开

Avoid eval!

Why? Try this:

eval(char('chro''&Xntqbnlotsdqg`raddmg`bjdc-&('+1))

Did you expect that?

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Answer 2

Jos (10584) 2013-12-3

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https://ww2.mathworks.cn/matlabcentral/answers/108284-how-can-i-use-the-output-of-sprintf-to-read-the-content-of-a-matrix#answer_117092

编辑：Jos (10584) 2013-12-3

在 MATLAB Online 中打开

How do you get these matrices in the first place? Load them from disk? If you think of a clever way to get them into your workspace them you can avoid EVAL which comes will all kind of nasty problems …

Assuming the variables "results*" are loaded from a file. If not, you can temporarily save them to a file using save('myfile.mat','results*')

S = load('myfile.mat','results*') % load into a structure
FN = fieldnames(S)
for k=1:numel(FN)
   tmp = S.(FN{k})
   [zMin(k), idx(k)] = min(val(:, i+1:i+5), [], 2) % your code here, not tested
end