about logical indexing

Today, M-Lint was telling me that "logical indexing is usually faster than FIND".

I didn't knew what logical indexing means. a short google search and i found this out:

if you want to perform the following operation:

KdP(find( (dP> 1000) & (dP <= 2000) )) = 2;

you can optimize it just by omitting the find command just like this:

KdP( (dP> 1000) & (dP <= 2000) ) = 2;

. Matlab is just capable to handle the "logical indexing" which means the indexes of the vector that match the conditions.

use profiler to improve code

there is a very cool application in matlab to help you improve the code. it is called "profiler".
let me give you an example. If you have a script named "name_of_script.m", you can enter the following commands to check it:

profile on, name_of_script, profreport('name_of_script')

at the end, you'll get a new windows, where you can find which section of the script is the bottleneck.

happy coding!