Why i get error message when trying using lowpass?

Question

Azmi Mohammad 2025-2-13

回答： Star Strider 2025-2-13

Hi all,

when i try to use lowpass command, i got this message;

lowpass requires Signal Processing Toolbox.

The image as below;

I am using Academic version and i have installed Signal Processing toolbox during installation

Here is the image;

Manikanta Aditya 2025-2-13

Check Installation:

Ensure that the Signal Processing Toolbox is installed. You can check this by typing the following command in MATLAB command window:

ver

Answer 1

Star Strider 2025-2-13

Since it seems to be installed, you may be having path problems.

Run these from a script or your Command Window:

restoredefaultpath

rehash toolboxcache

then see if you have access to the Signal Processing Toolbox functions.

If you stiill have probleems after that, Contact Support.