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Frequency spacing for frequency response.
Syntax
f = freqspace(n) f = freqspace(n,'whole') [f1,f2] = freqspace(n) [f1,f2] = freqspace([m n]) [x1,y1] = freqspace(n,'meshgrid') [x1,y1] = freqspace([m n],'meshgrid')
Description
freqspace returns the implied frequency range for equally spaced frequency responses. This is useful when creating frequency vectors for use with freqz.
f = freqspace(n)
returns the frequency vector f assuming n evenly spaced points around the unit circle. For n even or odd, f is (0:2/n:1). For n even, freqspace returns (n + 2)/2 points. For N odd, it returns (n + 1)/2 points.
f = freqspace(n,'whole')
returns n evenly spaced points around the whole unit circle. In this case, f is 0:2/n:2*(n-1)/n.
[f1,f2] = freqspace(n)
returns the two-dimensional frequency vectors f1 and f2 for an n-by-n matrix. For n odd, both f1 and f2 are [-1 + 1/n:2/n:1-1/n]. For n even, both f1 and f2 are [-1:2/n:1-2/n].
[f1,f2] = freqspace([m n])
returns the two-dimensional frequency vectors f1 and f2 for an m-by-n matrix.
[x1,y1] = freqspace(n,'meshgrid')
and
[x1,y1] = freqspace([m n],'meshgrid')
are equivalent to
[f1,f2] = freqspace(...); [x1,y1] = meshgrid(f1,f2);See the online MATLAB Function Reference for details on the
meshgrid function.
See Also
freqz |
Frequency response of digital filters. |
invfreqz |
Discrete-time filter identification from frequency data. |