How can I save only one piece of data from the command window to a file?

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Mikael 2014-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/115720-how-can-i-save-only-one-piece-of-data-from-the-command-window-to-a-file

评论： Mikael 2014-2-11

I am running a script to reject artifacts and I want to collate the number of rejections over each block/subject (there are a lot) into a single document. Besides doing it manually, is there a way to pull just the one number I want from each iteration into a file? This is what the output of one block from the function looks like in the command window:

detected 36 zvalue artifacts rejected 33 trials completely rejected 0 trials partially resulting 47 trials

For some reason the number of rejected trials aren't in any .mat file output, so basically I want an output that for every subject/block gives me: Rejected X trials completely

Thank you!

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Answer 1

Iain 2014-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/115720-how-can-i-save-only-one-piece-of-data-from-the-command-window-to-a-file#answer_123996

Before your loop:

fid = fopen(filename,'w');

In the loop:

fwrite(fid,['Rejected ' num2str(rejected) ' trials, and some more random text and variable to illustrate ' num2str(5) 10 13],'uint8');

After the loop

fclose(fid)

Then, open the file in a text editor. fprintf can be used instead of fwrite.

Alternatively, just log the answer to a result vector: Before the loop:

results = [];

In the loop:

results(end+1) = rejected;

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Mikael 2014-2-11

First, thank you for your input. Also, I'm pretty new to matlab so if this doesn't really make sense I apologize. I think that part of the issue is that 'rejected' isn't actually recognized as a variable. When I try to run either of your suggestions I get "Undefined function or variable 'rejected'." I looked in the script of the function I was using and I found a couple of lines that look like they are generating the output I am seeing in the command window: count_complete_reject = 0; (then later) count_complete_reject = count_complete_reject + 1; (and even later) fprintf('rejected %3d trials completely\n', count_complete_reject)

I don't know how to properly integrate the code so I can get a separate output file (I tried and got an 'undefined function or variable rejected' error) any further help would be huge.

Apologies if I'm super dense!

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