How can i transform rad/s to hertz for graph?

clc

clear

hold on

fid = fopen('2.1.2.txt');

a=fscanf(fid,'%g %g %g %g',[4 inf]);

a = a';

fclose(fid)

%tm=a(:,1);

s1=a(:,2);

s2=a(:,3);

s3=a(:,4);

ts=0:(1/15000):(1/15000)*(length(s1)-1);

makts=3; %%%%%%%%%%%%%DEĞİŞTİR

s1=s1/max(s1);

s2=s2/max(s2);

s3=s3/max(s3);

subplot(3,2,1)

plot(ts,s1,'k')

axis([0 makts -1 1])

ylabel('Normalized Amplitude')

xlabel('Time (s)')

subplot(3,2,3)

plot(ts,s2,'k')

axis([0 makts -1 1])

ylabel('Normalized Amplitude')

xlabel('Time (s)')

subplot(3,2,5)

plot(ts,s3,'k')

axis([0 makts -1 1])

ylabel('Normalized Amplitude')

xlabel('Time (s)')

%%%%%%%%%DC%%%%%%

x=s1;

sp=fft(x);

nn=length(x);

sp(1:2)=zeros(size(1:2));

sp(nn-1:nn)=zeros(size(1:2));

x=real(ifft(sp));

%%%%%%%%%%%%%%%%%%

fss=15000;

T=1/fss;

upfreq=fss/2;

% ************ FFT ****************

p1=length(x);

z=(2/p1)*abs(fft(x));

z=z(1:p1/2-1);

z(1,1)=0.5*z(1,1);

nff=length(z);

nf1=round(2*nff*upfreq/fss);

z=z(1:nf1);

subplot(3,2,2)

s1z=abs(z)/max(abs(z));

plot((0:nf1-1).*(fss/p1),s1z,'k'),

axis([0 2000 0 max(s1z)])

hold on

ylabel('Normalized Amplitude')

xlabel('Frequence (Hz)')

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

x=s2;

sp=fft(x);

nn=length(x);

sp(1:2)=zeros(size(1:2));

sp(nn-1:nn)=zeros(size(1:2));

x=real(ifft(sp));

% ************ FFT ****************

p1=length(x);

z=(2/p1)*abs(fft(x));

z=z(1:p1/2-1);

z(1,1)=0.5*z(1,1);

nff=length(z);

nf1=round(2*nff*upfreq/fss);

z=z(1:nf1);

subplot(3,2,4)

s2z=abs(z)/max(abs(z));

plot((0:nf1-1).*(fss/p1),s2z,'k'),

axis([0 2000 0 max(s2z)])

ylabel('Normalized Amplitude')

xlabel('Frequence (Hz)')

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

x=s3;

sp=fft(x);

nn=length(x);

sp(1:2)=zeros(size(1:2));

sp(nn-1:nn)=zeros(size(1:2));

x=real(ifft(sp));

% ************ FFT ****************

p1=length(x);

z=(2/p1)*abs(fft(x));

z=z(1:p1/2-1);

z(1,1)=0.5*z(1,1);

nff=length(z);

nf1=round(2*nff*upfreq/fss);

z=z(1:nf1);

subplot(3,2,6)

s3z=abs(z)/max(abs(z));

plot((0:nf1-1).*(fss/p1),s3z,'k'),

axis([0 2000 0 max(s3z)])

ylabel('Normalized Amplitude')

xlabel('Frequence (Hz)')

[Torsten]

1 Hz equals 2*pi rad/s

and

1 rad/s equals 1/(2*pi) Hz.

Can you take it from here ?

Answer 1

[Bruno Luong]

omega = 2*pi*f

with unit

omega [rad/s]
f [1/s]