How can I get the sprintf function to work for a cell array and a matrix?

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S 2015-2-6

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评论： Star Strider 2015-2-9

I am writing a code in which I need to use the sprintf function to display the output values. The output values include 2 cell arrays and 5 matrices. For whatever reason I keep getting this error:

Error using sprintf
Function is not defined for 'cell' inputs.

This is the code I am currently using:

output(2)= {sprintf('%s \t %s \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f', probe_label, gene_label, [dtAm], [dtAstd]', [dtBm], [dtBstd]', [dtAB], [dt_pval_sig])};

probe_label and gene_label are the cell arrays and the rest are matrices.

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Answer 1

Star Strider 2015-2-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/175972-how-can-i-get-the-sprintf-function-to-work-for-a-cell-array-and-a-matrix#answer_167189

在 MATLAB Online 中打开

You have to convert them with char to use sprintf and its friends:

probe_label = {'abc' 'def' 'ghi' 'jkl'};
gene_label = {'mno' 'pqr' 'stu' 'vwx'};
[dtAm, dtAstd, dtBm, dtBstd, dtAB, dt_pval_sig] = deal(rand(4,1), rand(1,4), rand(4,1), rand(1,4), rand(1,4), rand(1,4));
for k1 = 1:size(probe_label,2)
    output{k1,:} = sprintf('%s \t %s \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f', char(probe_label(k1)), char(gene_label(k1)), dtAm(k1), dtAstd(k1), dtBm(k1), dtBstd(k1), dtAB(k1), dt_pval_sig(k1)); 
end

I created the data, but this code should work with your data without modification (I hope).

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S 2015-2-9

在 MATLAB Online 中打开

The for loop seems to b working for me now. However I keep getting this error now:

Cell contents reference from a non-cell array object.

I modified the for loop to be similar to what Jan Simon suggested.

for k1 = 1:size(probe_label,2)
    output{k1,:} = sprintf('%s \t %s \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f', probe_label{k1}, gene_label{k1}, dtAm{k1}, dtAstd{k1}, dtBm{k1}, dtBstd{k1}, dtAB{k1}, dt_pval_sig{k1}); 
end

What does this error mean and how can I fix it?

Star Strider 2015-2-9

在 MATLAB Online 中打开

Your numeric data aren’t cells. Change the ‘output’ assignment to:

output{k1,:} = sprintf('%s \t %s \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f \t %.3f', probe_label{k1}, gene_label{k1}, dtAm(k1), dtAstd(k1), dtBm(k1), dtBstd(k1), dtAB(k1), dt_pval_sig(k1));

and it should work

I didn’t test this change specifically, but it is only a minor variation on my original code. Note that only ‘probe_label{k1}’ and ‘gene_label{k1}’ have the curly-braces ‘{}’ cell reference, while your numeric arrays have standard parentheses ‘()’ array references. The referencing conventions can be a bit difficult to understand until you work with them.

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