How to get FFT coefficient plot

2 次查看（过去 30 天）
Ramesh Bala
Ramesh Bala 2019-2-13
评论： Satoshi Kobayashi 2019-2-16
How to obtain FFT for the given amplitude (vs) time plot?
Kindly inform me is below code is right ?? as I don'see any FFT peaks in the figure 2?
clear all
close all
% 200 kHz frequency load and the length of time signal is till 10761 as shown
figure
% provides time(vs) amplitude values
E = load ('5200D1218');
%Fs = 200*10^3; %frequency load used 200kHz
T = E.data(1,1).vectorza(1,1:10761); % time
P = E.data(1,1).Amplitude(4,1:10761); % amplitude values obtained
plot(T,P);
%now to plot FFT for the amp(vs) time results
figure
p = fft(P);
plot(T,p);

请先登录，再回答此问题。

采纳的回答

Satoshi Kobayashi
Satoshi Kobayashi 2019-2-13
figure
p = fft(P);
plot(T,abs(p)/length(p)); % two-sided spectrum
  2 个评论
Ramesh Bala
Ramesh Bala 2019-2-14
Danke
I will give a try ,but what is the length ?? is that the last value of the amplitude of the signal

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Fourier Analysis and Filtering 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by