Matlab Can't Access Bandpass Filter

Hi, every time I try and use certain portions of the signal toolbox, I am unable to call some functions, like 'bandpass', or any other filters. I am met with an error that reads:

Undefined function 'bandpass' for input arguments of type 'double'.

When I run:

which bandpass

It returns:

'bandpass' not found.

I have the signals toolbox installed, the bandpass file is stored in the directory '/MATLAB_R2017b.app/toolbox/signal/signal/private', I'm sure my license is still up to date, and another classmate is experiencing the same issue. I have also tried reinstalling the signals toolbox, and it was unsuccessful.

Any help is greatly appreciated, thank you!

Answer 1

[Star Strider]

The bandpass (link) and similar functions were introduced in R2018a. It uses an elliptic filter design, so you can duplicate its design with the ellipord (link) and related functions. Remember to use the filtfilt function to do the actual filtering.

The path you found is likely to the Filter Designer App. The bandpass function is: C:\Program Files\MATLAB\R2018a\toolbox\signal\signal\bandpass.m.

[Isaiah Egan]

Thank you, I was using R2017b. I'll update and see if that works.

[Star Strider]

My pleasure.

It will work! I’ve used some of those filters.