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- 29th March 2007, 16:18 #1

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## Calculate the gain in matlab

hi all,

Can anyone explain how to calculate the gain of a filter in matlab. I can simulate the filter using fdatool and it tells me the gain. However i cannot manually calculate the gain via the results viewer.

Its an iir filter and i have coefficients / transfer fucntion etc.

Thank you

Andy

- 29th March 2007, 16:18

- 30th March 2007, 09:36 #2
## Re: Calculate the gain in matlab

If u have coefficients a and b den use [H,W]=freqz(b,a,....) built in function of MATLAB. Plot abs(H) against W because you have to compute gain at each frequency W

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