It seems that "files" is an array of structures, and isdir is a variable under the structure (read MATLAB documentation for further informations about structures) at position i, so you can't replace the instruction with the function-like one.
Matlab equivalent code for file
Question
Can I replace ~files(i).isdir
for ~isdir('files(i)')
?
What does the .
do in the code? Is it like an abbreviation of code?
Solution
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