Common errors which increases the computation time

Hi!I'm working on a Fluid dynamics problem.Have written the code for solving block tridiagonal matrix.Have used finite difference method in the calculation.It takes hours to execute.What are the common mistakes which increases the computation time ?

[OCDER]

Here's a good article for this.

https://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html

Answer 1

[Jan]

It would not be efficient to post a list of all possible problems. Better post the relevant part of your code.

Find the bottleneck of the code with the profile command. Sometimes is is a simple disp() command, which displays the progress. Or maybe a forgotten pre-allocation, or repeated calculations of the expensive functions like exp() or power() with the same inputs.