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.
