function for editing a file

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Joseph Stalin
Joseph Stalin 2013-3-5
Dear Techies, I want to read and write a file with some changes. I am able to read a particular line using fgetl().After reading the line I want to edit the line and save it in the same file. What function I need to use for this purpose?
reg, joseph

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Jan
Jan 2013-3-5
This possible by using fwrite or fprintf when the number of characters do not change. If it does or could change, there is no other way than reading the complete file, modifying the data and re-write it:
Str = fileread(FileName);
Str = strrep(Str, char([13, 10]), char(10)); % Care for linebreaks
CStr = regexp(Str, char(10), 'split');
CStr{23} = strrep(CStr{23}, 'short string', 'much longer string');
FID = fopen(FileName, 'w'); % or wt
if FID == -1, error('Cannot open file for writing: %s', FileName); end
fprintf(FID, '%s\n', CStr{:});
fclose(FID);
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Joseph Stalin
Joseph Stalin 2013-3-8
Thanks Jan.I have one more question. In scripting we are using these braces for accessing matrices.{},() I just want to know which braces to use when?

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