Reshape non-even length columns into text output

Question

Sam Zipper 2013-4-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71672-reshape-non-even-length-columns-into-text-output

Hi All-

I'm trying to convert some data from one form to another, and have run into trouble. I have a large matrix of data (257 x 257). For each row, I need to write space-separated output so that the first 10 values are on one line, the next 10 on another, etc. This would be fairly easy to do using reshape, except when I get to the last line there are only 7 values remaining, so matlab returns an error.

For example, if I had:

data = [1:13; 14:26];

I would want my output from dlmwrite to be:

1 2 3 4 5 6 7 8 9 10

11 12 13

14 15 16 17 18 19 20 21 22 23

24 25 26

Any advice? I'm using R2011a. Thanks in advance! -sam

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Answer 1

Image Analyst 2013-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/71672-reshape-non-even-length-columns-into-text-output#answer_81912

You can do custom stuff like that easily with fprintf().

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Sam Zipper 2013-4-12

在 MATLAB Online 中打开

Thanks, in case any else wonders, here's what I ended up with:

[m,n] = size(data);
for row = 1:m;
    for col = 1:10:n;
        if (col+9 <= n)  % if there are more than 10 data points left
            fprintf(fileID, '  %9.4e', data(row,col:col+9));   
            fprintf(fileID, '\n');
        else    % if there are less than 10
            fprintf(fileID, '  %9.4e', data(row,col:n));     
            fprintf(fileID, '\n');
        end
    end
end