FFT of 100 data points

Question

happy 2011-11-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/22119-fft-of-100-data-points

回答： Ryan T 2016-3-18

Hi..

my problem is this:

I have 100 data taken from 0 to 346.5 microseconds. the time interval for each data is 3.5 microseconds. I need to plot the FFT of this data. Please help me..

Thank you very much.

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Answer 1

Amith Kamath 2011-11-24

4
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/22119-fft-of-100-data-points#answer_29144

在 MATLAB Online 中打开

if x is your data,

L=length(x);
dt=3.5*10^(-6); %time.
fs=1/dt;
t=(0:1:L-1)*dt; %If you'd like to plot the time signal: plot(t,x)
out=fft(x,L)/L;
figure, plot(fs/2*linspace(0,1,(length(out)/2)+1),abs(out(1:(length(out)/2)+1))),title('One sided Spectrum')
xlabel('Normalized frequency')
ylabel('Magnitude')