How to vectorize writing to a txt file
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Hi there,
I have to write a function in matlab to create a txt file with the following format:
(x(1),y(1)),(x(2),y(2)),...(x(end),y(end))
I have the following piece of code (whre L is the length of vectors x and y)
for r=1:L;fprintf(fileOutput,['(',num2str(time(r)),',',num2str(signal(r)),'), ']);end
which obviously does the trick but I was wondering if anybody knows how to vectorize the expresion so that it runs much faster.
Any help will be welcomed!!
Thank you!
采纳的回答
You could go for something like this:
buffer = sprintf('(%f,%f),', [time; signal]) ; % FormatSpec repeated.
buffer(end) = [] ; % Remove extra ','.
fid = fopen('output.txt', 'w') ;
fwrite(fid, buffer) ;
fclose(fid) ;
更多回答（1 个）
esbolico
2013-4-24
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1 个评论
Cedric
2013-4-24
Dear Esbolico,
The interesting "thing" with SPRINTF and FPRINTF, is that they will repeat the format (here '(%f,%f),') as many time as needed to print all elements of the array(s) that are given to them. It is certainly useful when you want to avoid writing loops. I'm glad it helped!
Regards
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