Home/ Questions/Q 7923131
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-03T17:12:22+00:00

I might have misunderstood something.. but I expected the running of a code in

  • 0

I might have misunderstood something.. but I expected the running of a code in the editor and in the command window to be the same..

I have the following code in the editor

display('  ');
display('script');
fac = @(n) prod(1:n);

n=20;
display(['- use of anonymous function: fac = @(n) prod(1:n); with n = ' num2str(n)]);
tic; fac(n); toc;

display(['- use of build in MatLab function: factorial(); with n = ' num2str(n)]);
tic; factorial(n); toc;

before I run (is that called compiled or execute?) I quickly type in the same command in the command window. Which gives me this:

strange performance time

So all of a sudden the factorial function in the editor got a boost when it comes to performance.. What just happened?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    First, the calculation you are trying to measure is too quick to get anything like an accurate reading. It is way below the measurement noise you get when using tic/toc because of other processes and activity on the system. To get more accurate measures repeat the calculation many times… (I would repeat the calculation so it takes 10-20 seconds).

    Second, there is indeed a difference between code typed interactively and in a script. I think the JIT only runs for code run from a script or function m-file, where and not for stuff running in the interpreter (but I am struggling to find a reference for this now – I will add if I find it).

    • 0