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using feval or not?

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Bruno Luong
Bruno Luong il 29 Lug 2023
Modificato: Bruno Luong il 31 Lug 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 Commenti
Rik il 31 Lug 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 il 31 Lug 2023
Modificato: Bruno Luong il 31 Lug 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

Accedi per commentare.

Risposta accettata

Jan il 30 Lug 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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