It will make your code more maintainable and understandable.
Mat lab says error when no error.
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Also try not to turn your code into an alphabet soup of variables use descriptive variable names not just single letters or cryptic shorthand for everything.
See doc sprintf for control characters valid in the format string.
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This may be the reason matlab can see the files in some circumstances and not others depends on how it tries to access the files.
Do not use image as the name of a variable or else you will destroy a built in function also called image.
Control character u is not valid.
So as said put your code and excel file in my documents as to reading the excel file use the full path of the file instead of just the file name.
In sample gui save callback at 225 in gui mainfcn at 95 in sample gui at 42 in hobject eventdata sample gui save callback hobject eventdata guidata hobject.
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If you have downloaded the installation files make sure there is a corresponding zip file for each product ex.
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If you are missing the zip files for any product or if the zip files have been extracted the installer will not list those products to install.