How to append data from multiple runs of script without overwriting previous data.

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Jaslyn Tan
Jaslyn Tan 2019-5-15
评论： Zainab Saka 2021-11-2
Hi,
My code follows. Everything is correct except that only the value from the last run of the script is saved in the output file. Please can someone help?
The commands commented out also have been tried and do not work. Please help me...
numfilesx = 2
numfilesy = 2
OutputFilePath = 'C:\1Feb19 output';
OutputFilePhase = 'PhaseDiff.csv';
for x = 0:numfilesx
for y = 0:numfilesy
myfilename = sprintf("C:\\1Feb19_final\\row%d_%d.csv", y, x);
PhaseDiff = atan (Y1(1)/Z1(1));
csvwrite(filenamePhase,PhaseDiff,x,y)
%dlmwrite(filenamePhase,PhaseDiff,'delimiter',' ','roffset',1)
%filenamePhase = fullfile(OutputFilePath, OutputFilePhase);
%[fid1, msg] = fopen(filenamePhase, 'wt');
%if fid1 < 0
% error('Could not open file "%s" because "%s"', fid1, msg);
%end
%fprintf(fid1, '%s\n', PhaseDiff);
fclose('all');
end
end

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采纳的回答

Rik
Rik 2019-5-15
Use one of the append options from fopen:
'r' Open file for reading.
'w' Open or create new file for writing. Discard existing contents, if any.
'a' Open or create new file for writing. Append data to the end of the file.
'r+' Open file for reading and writing.
'w+' Open or create new file for reading and writing. Discard existing contents, if any.
'a+' Open or create new file for reading and writing. Append data to the end of the file.
'A' Open file for appending without automatic flushing of the current output buffer.
'W' Open file for writing without automatic flushing of the current output buffer.

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