Problem with missing firchck

Hi

while running 'bandstop' function I am getting the error message:

Error using designfilt>parseAndDesignFilter (line 516)

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

and I can't find 'firchk' function. I do have Signal processing and Filter Design HDL Coder 3.1.6. toolbeoxes installed.

While installing these toolboxes no other dependecny toolbox was required.

I run R2019b.

I found the firchk.m code on the internet, when added as an exteranal code all runs fine.

Any idea in which toolbox 'firchk' is distributed or if this is just a bug and the function in not included

in the installed toolboxes?

Thanks !

Roman

[Kavya Vuriti]

Can you provide code snippet which uses 'bandstop' function.