"It worked well at R2012b version but it dowsnt work at R2018a version"
That code actually never worked "well". It is slow, complex, hard to debug, badly designed code. Introspective commands like exist are slow. Commands like eval that magically access variable names are slow, pointlessly complex, inefficient, and make debugging hard.
Read this to know why:
The best thing to do would be to rewrite that code using simpler, more efficient methods. For example, using eval to assign fields of a structure is not required at all, because you can do this much simpler and more efficiently using dynamic fieldnames:
In my opinion, putting all of those commands into cellfun calls was not a way to write clear, neat code anyway. Loops are perfectly neat and efficient, so why not use them?
