How to get FFT coefficient plot

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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?
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% 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);

Accepted Answer

Satoshi Kobayashi
Satoshi Kobayashi on 13 Feb 2019
figure
p = fft(P);
plot(T,abs(p)/length(p)); % two-sided spectrum
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