How do you add a file extension when creating a file based on function input?

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Domenick Avanzi
Domenick Avanzi 2015-4-12
评论： Image Analyst 2015-4-12
I want to be able to use an input for a function and create a text file based on the fid. The strjoin() function always inputs a space in between the fid and the '.txt'. This is what I have now, but I need a more optimal method.
function[...] = name(fid)
textfile = strjoin({fid,'.txt'})
end
The output would then look like 'fid .txt'. I need to have the space removed. Is there any better function than using strjoin()?

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Star Strider
Star Strider 2015-4-12
I’m not certain what you want (because I don’t know what ‘fid’ is), but see if:
textfile = [fid,'.txt'];
does what you want.
Example:
fid = 'FileNamePrefix';
textfile = [fid,'.txt']
produces:
textfile =
FileNamePrefix.txt
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Image Analyst
Image Analyst 2015-4-12
An alternate way, useful for when the filenames are really complicated
textfile = sprintf('%s.txt', fid);
Note that fid is the variable name commonly given to the output of fopen() and not to the base file name string, so I recommend you choose a different name for the fid variable, like, how about baseFileName?

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