constructing file identifier from string?

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Joseph Koval
Joseph Koval 2018-7-16
回答： KSSV 2018-7-16
I open several files, write text to the files upon opening them...for example...
fullfileKBDR = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KBDR_',forecastyears(k,:),'.csv')
fileID1 = fopen(fullfileKBDR, 'w')
fprintf(fileID1,formatSpec)
fullfileKMHT = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KMHT_',forecastyears(k,:),'.csv')
fileID2 = fopen(fullfileKMHT, 'w');
fprintf(fileID2,formatSpec)
fullfileKASH = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KASH_',forecastyears(k,:),'.csv')
fileID3 = fopen(fullfileKASH, 'w');
fprintf(fileID3,formatSpec)
fullfileKPWM = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KPWM_',forecastyears(k,:),'.csv')
fileID4 = fopen(fullfileKPWM, 'w');
fprintf(fileID4,formatSpec)
But the question is that later in the code, I have a loop where I'm processing data in the loop. I want to be able to construct the file identifier (e.g. fileID1, fileID2, fileID3, fileID4) and write to the file based on the loop counter. So something that would like this, but it doesn't work:
for n = 1:4
%Do stuff
nasstr = string(n)
fileident = strcat('fileID',nasstr)
fprintf(fileident, 'blah\n')
end
Can someone share the syntax that would make this work? Thanks.

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采纳的回答

KSSV
KSSV 2018-7-16
You can initialize file identifiers as an array, and use them in loop.
fullfileKBDR = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KBDR_','.csv')
fid(1) = fopen(fullfileKBDR, 'w')
fprintf(fileID1,formatSpec)
fullfileKMHT = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KMHT_','.csv')
fid(2) = fopen(fullfileKMHT, 'w');
fprintf(fileID2,formatSpec)
fullfileKASH = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KASH_','.csv')
fid(3) = fopen(fullfileKASH, 'w');
fprintf(fileID3,formatSpec)
fullfileKPWM = strcat('/Users/jkoval/Documents/MATLAB/archived_fod_forecasts/output/KPWM_','.csv')
fid(4) = fopen(fullfileKPWM, 'w');
fprintf(fileID4,formatSpec)
for n = 1:4
%Do stuff
nasstr = string(n)
fid(n) % this gives file identifier
end

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