PLOTFFT Plot the output from FFT
Usage: plotfft(coef);
plotfft(coef,fs);
PLOTFFT(coef) plots the output from the fft function. The
frequency axis will use normalized frequencies between 0 and 1 (the
Nyquist frequency).
PLOTFFT(coef,fs) does the same for the FFT of a signal sampled at
a sampling rate of fs Hz.
PLOTFFT(coef,fs,dynrange) additionally limits the dynamic range of the
plot. See the description of the 'dynrange' parameter below.
PLOTFFT accepts the following optional arguments:
'dynrange',r Limit the dynamical range to r by using a colormap in
the interval [chigh-r,chigh], where chigh is the highest
value in the plot. The default value of [] means to not
limit the dynamical range.
'db' Apply 20*log_{10} to the coefficients. This makes
it possible to see very weak phenomena, but it might show
too much noise. This is the default.
'dbsq' Apply 10*log_{10} to the coefficients. Same as the
'db' option, but assumes that the input is already squared.
'lin' Show the coefficients on a linear scale. This will
display the raw input without any modifications. Only works for
real-valued input.
'linsq' Show the square of the coefficients on a linear scale.
'linabs' Show the absolute value of the coefficients on a linear
scale.
'nf' Display negative frequencies, with the zero-frequency
centered in the middle. This is the default.
'posfreq' Display only the positive frequencies.
'dim',dim If coef is multidimensional, dim indicates the
dimension along which are the individual channels oriented.
Value 1 indicates columns, value 2 rows.
'flog' Use logarithmic scale for the frequency axis. This flag is
only valid in conjuction with the 'posfreq' flag.
In addition to these parameters, PLOTFFT accepts any of the flags
from NORMALIZE. The coefficients will be normalized as specified
before plotting.
Url: http://ltfat.github.io/doc/fourier/plotfft.html
See also: plotfftreal.
Package: ltfat