writing vector element to file in .m files (via fprintf) produces no value while same command in terminal window does.

I have a .m file that uses fprintf to write text and a value to a file. Here are the statements (numOutputs = 1):

fprintf(fidResults,'\n\t\t%15s\t','ABS VAL OF DIFF');

for j = 1: numOutputs

fprintf(fidResults,'%10s: %16.2e',fieldval.outputName{j},diff(j));

end

fprintf(fidResults,'\n\t\t%15s\t','PCNT DIFF');

for j = 1: numOutputs

fprintf(fidResults,'%10s: %16.2e',fieldval.outputName{j},Pcntdiff(j));

end

Looking at the file that is written to I see:

ABS VAL OF DIFF BESSJ:

PCNT DIFF BESSJ: -6.37e-03

The first value, diff(j) is not being printed. If I pause at this line, I see that diff(j) does exist. If at this breakpoint, I manually hightlight thes same command, rightclick and select "Evaluate Selection" (ie if I execute the very same command at the prompt) the value is written. How is it that the exact same command executed at the exact same place in the program, one by terminal prompt and the other via the script, do not work??

[Stephen23]

What do you expect FPRINTF to print for an empty array?:

diff(1)

ans =

     []

Answer 1

[Carl Loeffel]

I figured it out. Really stupid of me to use "diff" as a variable name. "diff" is already taken as a matlab functions. Upon renaming to "delta" it worked fine.

Answer 2

[Carl Loeffel]

That's the thing. It is not empty when I stop at that line using a breatk point. And executing that line manually, fprintf(fidResults,'%10s: %16.2e',fieldval.outputName{j},diff(j)); at the prompt in the command window does write it out correctly. Only when I execute that line via running the .m file that it resides in does it become empty..