Calling octave functions from oct-files

[Evan]

I am converting some part of my program from octave scripts to
oct-files in order to improve performance. I find that I have to call
octave functions in a for loop. And if I use "feval" to do this, it
consumes a lot of time. The result is that the oct-file is even slower
than the octave script. So I wonder if there is an another way to call
octave functions. For example, can I get the pointer to the function,
then just use (*p)(args) to call the function?