Frequency response of digital filter

`freqz(___)`

with
no output arguments plots the frequency response of the filter.

**Note:** If the input to `freqz`

is
single precision, the frequency response is calculated using single-precision
arithmetic. The output, `h`

, is single precision.

[1] Oppenheim, Alan V., Ronald W. Schafer,
and John R. Buck. *Discrete-Time Signal Processing*.
2nd Ed. Upper Saddle River, NJ: Prentice Hall, 1999.

`abs`

| `angle`

| `designfilt`

| `digitalFilter`

| `fft`

| `filter`

| `freqs`

| `impz`

| `invfreqs`

| `logspace`

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