[f1,f2] = freqspace(n)returns the two-dimensional frequency vectorsf1和f2for ann-by-nmatrix.

freqspacereturns the implied frequency range for equally spaced frequency responses.freqspaceis useful when creating desired frequency responses for various one- and two-dimensional applications.

[f1,f2] = freqspace([m n])returns the two-dimensional frequency vectorsf1和f2for anm-by-nmatrix.

[x,y] = freqspace(___,'meshgrid')is equivalent to

[f1,f2] = freqspace(...); [x,y] = meshgrid(f1,f2);

f= freqspace(N)returns the one-dimensional frequency vectorfassumingN在t均匀间隔的点he unit circle.

f= freqspace(N,'whole')returnsN在t均匀间隔的点he whole unit circle. In this case,fis0:2/N:2*(N-1)/N.