How to fprintf one large variable that is a table?

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HC 2018-7-12

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编辑： dpb 2021-8-16

I have a variable "fluence_rate" in my workspace that is a 24056x2000 table. How do I frpintf this and have it perfectly aligned column by column instead of one extremely long column? Also is it normal if it takes a really long time?

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dpb 2018-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/410063-how-to-fprintf-one-large-variable-that-is-a-table#answer_328626

编辑：dpb 2021-8-16

在 MATLAB Online 中打开

nCol=10;                                    % how many columns you want???
fmt=[repmat('%11.3E',1,nCol) '.\n'];        % format string for that many
fprintf(fid,fmt,X.');                       % print array, note transpose

Adjust the column and format to suit

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djk 2021-8-16

Thank you DB! I used your solution to print arrays with variable column numbers to a file. I found a typo, though -

fprintf(fid,X.')

should be

fprintf(fid,fmt,X.')

Thank you again.

dpb 2021-8-16

编辑：dpb 2021-8-16

Indeed, good catch...I'll fix the original to reflect.

BTW, NOTA BENE that normally the nCol would be size(x,2), the number of columns in the array itself -- but the Q? here with an array of 2000 seemed like might want to cut that down -- although if each column really were a variable, then it might still be the right thing to do, just that printing such a large array in human-readable text format is the questionable decision.

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