using feval or not?

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Bruno Luong
Bruno Luong on 29 Jul 2023
Edited: Bruno Luong on 31 Jul 2023
I have function handle myfun I need to evalute
y = feval(myfun, x1, x2)
instead of direct call
y = myfun(x1, x2)
because when reading code in the first syntax I know then myfun is a function handle, and in the second syntax there might be a confusion of what myfun is. So for readability and maintainability I prefer using feval.
Note that myfun is NOT a string or char.
I test the speed and it seems to me there is no speed penalty one way or another.
I even think the presence of feval in the code will help the parser-compiler to have specific code of evaluation this function at the compiation time and not at a decision at the runtime, so in theory feval could be faster.
Is there any argument againts using feval?
  9 Comments
Rik
Rik on 31 Jul 2023

I was just saying I'm using feval instead of the direct call method. I don't have my installs handy, so I can't look it up for you when the direct call became possible.

At any rate, feval predates anonymous functions (which were introduced in v7). I can't check right now if v6 already had it, but v6.5 definitely does. (I don't extend the compatibility range of my functions to v6, since it doesn't support && and , which would require a lot of extra work in coding, for just a handful of people globally who would benefit)

Bruno Luong
Bruno Luong on 31 Jul 2023
Edited: Bruno Luong on 31 Jul 2023
@Rik "so I can't look it up for you when the direct call became possible."
When function handle is introduced. never mind this is not relevant to my question

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Accepted Answer

Jan
Jan on 30 Jul 2023
I do not see problems with using feval.
There have been a speed penalty in old versions, as far as I remember R2009a. But now the JIT-acceleration seems to remove the overhead automatically.

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