plotfft.m

是“MATLAB混合编程与工程应用”一书的源码

function PlotFFT(fftData, freq, powerSpect)
%PLOTFFT Plots the FFT and power spectral density data
%   PLOTFFT(FFTDATA, FREQ, POWERSPECT)
%   Plots the FFT and power spectral density from the specified data.
%   This file is used as an example for the .NET Builder
%   Language product.

%   Copyright 2001-2005 The MathWorks, Inc.
%   $Revision: 1.1.10.1 $  $Date: 2005/12/22 17:57:56 $

    len = length(fftData);
    if (len <= 0)
        return;
    end
    plot(freq(1:floor(len/2)), powerSpect(1:floor(len/2)))
    xlabel('Frequency (Hz)'), grid on
    title('Power spectral density')