IIR highpass filter for Hamming window

if this is used for calculating low-pass

lp=(wc/pi)*sinc((wc/pi)*M);

how can I calculate the highpass?

Answer 1

[Star Strider]

Use the Signal Processing Toolbox lp2hp function.

For an IIR filter, you have to have numerator and denominator polynomials, so what you posted may not define an IIR filter. I am not certain what you are doing.