MATLAB: How to test the times cost of each part in a program

running time

Dear Fellows,

I am trying to improve a program which runs very slowly. As there are a lot of nested functions, I need to find out which function costs the most time. Do you know how to realize that? For example, the main funciton call function1 and function1 calls function2 and so on…How could I indentify which function costs the enormous time?

Best Answer

Hi!

Use the profiler, located under "Tools" in the menu bar.

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MATLAB: Fmincon test the same parameters multiple times

fmincon has to build up the Jacobian matrix dC/dpi (C: costfunction, pi: parameter i).

For this end, fmincon calls the costfunction (number of parameters + 1) times with

p1,p2,p3,...,p6
p1+deltap1,p2,p3,...,p6
p1,p2+deltap2,p3,...,p6
...
p1,p2,p3,...,p6+deltap6

If you enhance precision of your output, you will see that the parameters are not the same, but that in each call one parameter differs slightly from the parameter values of the "main" call with p1,p2,...,p6.

Best wishes

Torsten.

MATLAB: Irreducibility test

syms x
evalin(symengine, 'irreducible', x^2 - 2)

Best Answer

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MATLAB: Fmincon test the same parameters multiple times

MATLAB: Irreducibility test

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