MATLAB: Is one variable not printing to the text correctly

fprintf

I use the following code, but when I open changing.txt, it shows:
 547.0 0.0000    547.0    360.0 iri_pd_lon280.txt
The second variable '0.0000' should be '0.3720'.
calc_alt=547.5000;
calc_W=0.3720;
alt_Bw=547.5000;
alt_nm=360;
filenames='iri_pd_lon280.txt';
fmt='%8.1f %.4f %8.1f %8.1f %s\r\n';%format for fprint
fileID=fopen('changing.txt','a');
fprintf(fileID,fmt, [calc_alt calc_W alt_Bw alt_nm filenames]);%write these values at the end of the file
fclose (fileID);

Best Answer

Bad syntax... [calc_alt calc_W alt_Bw alt_nm filenames] you're concatenating unlike variables and passing that to fprintf
Lose the braces, use a list of arguments instead--
fprintf(fileID,fmt, calc_alt, calc_W, alt_Bw, alt_nm, filenames)
and nirvana will ensue...
BTW, there's a repmat "trick" for writing format strings that's very handy to have seen--
fmt=[repmat(['%8.1f %.4f' repmat('%8.1f,1,2) '%s\n'];
not that bad here, but when numbers get to be much larger it can be a real boon...
BTW2: '\n' is enough on its own in virtually every case any more; adding both slows things down for no real benefit in general.
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