Using matrix operation on a function instead of for loop

Hi, My use case scenario is as follows:

for i=1:1:loop_count;
  out[i] = my_func(config_struct, i);
end

"config_struct" is a structure of function coefficients.

Is there any way to get rid of "for" loop as this is very slow?

Solution with an example would be very helpful.

Thanks, Atul

Answer 1

[James Tursa]

The only way to get rid of the for loop is to rewrite the function my_func to operate in a vectorized manner (assuming it doesn't already). This in and of itself will not necessarily give you much speed increase ... it will depend on what my_func does.

Have you pre-allocated out? I.e., have you put this line before the loop?

out = zeros(1,loop_count); % Assuming my_func returns a double scalar

You should also look into how my_func is doing its calculations ... maybe there is a way to speed it up.