Using eval for such trivial code like this is a really really bad idea, because you remove all of MATLAB's inbuilt code checking and code hinting tools. Do yourself a favor and learn how to program without eval. Doing so makes your code more faster, more robust and less obfuscated. Read this to know why eval is a really bad programming tool, even though beginners seem to think that it is the greatest tool ever:
In your case your code probably does not do what you think it does, and this is being exacerbated by using eval. If you look at the value of FN2 it is a very unusual filename:
>> FN2
FN2 = JDA09 10 11 12 13012.ohh
I suspect that you really wanted to do something in a loop like this:
FN1 = 'JDA0';
z = '0';
mn = 12;
yr = 9:13;
ext = '.ohh';
for k = 1:numel(yr)
tmp = sprintf('%s%02d%d%02d%s',FN1,yr(k),z,mn,ext)
fid = fopen(tmp,'rt');
... other code here
end
Summary Do NOT use eval for such trivial code. And use sprintf to generate the filename from the numbers. Read its documentation to know what formatting options it has.
