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tfplot.m
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tfplot.m
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function TFPLOT(F,Xfer,Fmin,Fmax,FLAG)
%TFPLOT Plots various transfer functions.
% TFPLOT(F,Xfer,Fmin,Fmax) plots the transfer function
% between Fmin and Fmax. F is the frequency vector (in Hz),
% Xfer is the transfer function. Fmin and Fmax are the
% minimum and maximum frequencies to be shown on the plot.
%
% TFPLOT(F,Xfer) plots the transfer function over the
% entire frequency range of F.
%
% TFPLOT(F,Xfer,Fmin,Fmax,FLAG) plots the transfer
% function in different forms depending on the value
% of FLAG. Click in the region of interest
% to zoom in. Each click will double the size of the plot.
% Double click to return to full scale.
%
% FLAG(1) Plot Type
% ------- ---------
% 1 (def) Magnitude and Phase versus F
% 2 Magnitude and Phase versus log10(F)
% 3 Bodelog (Magnitude and Phase versus log10(w))
% 4 Real and Imaginary
% 5 Nyquist (Real versus Imaginary)
% 6 Magnitude versus F
% 7 Phase versus F
% 8 Real versus F
% 9 Imaginary versus F
% 10 Magnitude versus log10(F)
% 11 Phase versus log10(F)
% 12 Real versus log10(F)
% 13 Imaginary versus log10(F)
% 14 Magnitude versus log10(w)
% 15 Phase versus log10(w)
%
%
% TFPLOT(F,Xfer,FLAG) plots the transfer function
% over the entire frequency range of F in the
% form defined by FLAG.
%
% Example (copy and paste into Matlab command line):
% f=(0:.01:100)';
% w=f*2*pi;
% k=1e5;m=1;c=1;
% tf=1./(m*(w*j).^2+c*j*w+k);
% figure(1);tfplot(f,tf)
% figure(2);tfplot(f,tf,5)
%
% See also TFEST, ASD, and CRSD.
% Copyright J. Slater, Dec 17, 1994
% Updated April 27, 1995
%Copy protection, expires Jan 1, 2001
lenF=length(F);
if lenF==1;
F=(0:length(Xfer)-1)'*F;
end
if nargin==2
Fmin=min(F);
Fmax=max(F);
FLAG=1;
elseif nargin==3
FLAG=Fmin;
if FLAG~=2
Fmin=min(F);
Fmax=max(F);
else
Wmin=min(F)*2*pi;
Wmax=max(F)*2*pi;
end
elseif nargin==4
Fmax=min([max(F) Fmax]);
Fmin=max([min(F) Fmin]);
FLAG=1;
else
if (FLAG~=3 & FLAG~=14 & FLAG~=15)
Fmax=min([max(F) Fmax]);
Fmin=max([min(F) Fmin]);
else
Wmax=min([max(F)*2*pi Fmax*2*pi]);
Wmin=max([min(F)*2*pi Fmin*2*pi]);
end
end
if Fmin>Fmax
disp('Fmin must be less than Fmax.')
return
end
inlow=floor(length(F)*(Fmin-min(F))/(max(F)-min(F)))+1;
inhigh=ceil(length(F)*(Fmax-min(F))/(max(F)-min(F)))+1;
if inlow<1,inlow=1;end
if inhigh>lenF,inhigh=lenF;end
Xfer=Xfer(inlow:inhigh,:);
F=F(inlow:inhigh,:);
mag=20*log10(abs(Xfer));
mag;
minmag=min(min(mag));
maxmag=max(max(mag));
phase=unwrap(angle(Xfer))*180/pi;
phmin_max=[floor(min(min(phase))/45)*45 ceil(max(max(phase))/45)*45];
minreal=min(min(real(Xfer)));
maxreal=max(max(real(Xfer)));
minimag=min(min(imag(Xfer)));
maximag=max(max(imag(Xfer)));
if FLAG==1
subplot(2,1,1)
plot(F,mag)
xlabel('Frequency (Hz)')
ylabel('Mag (dB)')
grid on
% Fmin,Fmax,min(mag),max(mag)
axis([Fmin Fmax minmag maxmag])
zoom on
subplot(2,1,2)
plot(F,phase)
xlabel('Frequency (Hz)')
ylabel('Phase (deg)')
grid on
axis([Fmin Fmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
elseif FLAG==2
subplot(2,1,1)
semilogx(F,mag)
xlabel('Frequency (Hz)')
ylabel('Mag (dB)')
grid on
% Fmin,Fmax,min(mag),max(mag)
axis([Fmin Fmax minmag maxmag])
zoom on
subplot(2,1,2)
semilogx(F,phase)
xlabel('Frequency (Hz)')
ylabel('Phase (deg)')
grid on
axis([Fmin Fmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
elseif FLAG==3
subplot(2,1,1)
mag=20*log10(abs(Xfer));
semilogx(F*2*pi,mag)
xlabel('Frequency (Rad/s)')
ylabel('Mag (dB)')
grid on
axis([Wmin Wmax minmag maxmag])
zoom on
subplot(2,1,2)
semilogx(F*2*pi,phase)
xlabel('Frequency (Rad/s)')
ylabel('Phase (deg)')
grid on
axis([Wmin Wmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
elseif FLAG==4
subplot(2,1,1)
plot(F,real(Xfer))
xlabel('Frequency (Hz)')
ylabel('Real')
grid on
axis([Fmin Fmax minreal maxreal])
zoom on
subplot(2,1,2)
plot(F,imag(Xfer))
xlabel('Frequency (Hz)')
ylabel('Imaginary')
grid on
axis([Fmin Fmax minimag maximag])
zoom on
elseif FLAG==5
subplot(1,1,1)
imax=round(length(F)*Fmax/max(F));
imin=round(length(F)*Fmin/max(F))+1;
plot(real(Xfer(imin:imax)),imag(Xfer(imin:imax)))
xlabel('Real')
ylabel('Imaginary')
grid on
zoom on
elseif FLAG==6
subplot(1,1,1)
mag=20*log10(abs(Xfer));
plot(F,mag)
xlabel('Frequency (Hz)')
ylabel('Mag (dB)')
grid on
axis([Fmin Fmax minmag maxmag])
zoom on
elseif FLAG==7
subplot(1,1,1)
plot(F,phase)
xlabel('Frequency (Hz)')
ylabel('Phase (deg)')
grid on
phmin_max=[floor(min(phase)/45)*45 ceil(max(phase)/45)*45];
axis([Fmin Fmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
elseif FLAG==8
subplot(1,1,1)
plot(F,real(Xfer))
xlabel('Frequency (Hz)')
ylabel('Real')
grid on
axis([Fmin Fmax minreal maxreal])
zoom on
elseif FLAG==9
subplot(1,1,1)
plot(F,imag(Xfer))
xlabel('Frequency (Hz)')
ylabel('Imaginary')
grid on
axis([Fmin Fmax minimag maximag])
zoom on
elseif FLAG==10
subplot(1,1,1)
mag=20*log10(abs(Xfer));
semilogx(F,mag)
xlabel('Frequency (Hz)')
ylabel('Mag (dB)')
grid on
axis([Fmin Fmax minmag maxmag])
zoom on
elseif FLAG==11
subplot(1,1,1)
semilogx(F,phase)
xlabel('Frequency (Hz)')
ylabel('Phase (deg)')
grid on
phmin_max=[floor(min(phase)/45)*45 ceil(max(phase)/45)*45];
axis([Fmin Fmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
elseif FLAG==12
subplot(1,1,1)
semilogx(F,real(Xfer))
xlabel('Frequency (Hz)')
ylabel('Real')
grid on
axis([Fmin Fmax minreal maxreal])
zoom on
elseif FLAG==13
subplot(1,1,1)
semilogx(F,imag(Xfer))
xlabel('Frequency (Hz)')
ylabel('Imaginary')
grid on
axis([Fmin Fmax minimag maximag])
zoom on
elseif FLAG==14
subplot(1,1,1)
mag=20*log10(abs(Xfer));
semilogx(F*2*pi,mag)
xlabel('Frequency (Rad/s)')
ylabel('Mag (dB)')
grid on
axis([Wmin Wmax minmag maxmag])
zoom on
elseif FLAG==15
subplot(1,1,1)
semilogx(F*2*pi,phase)
xlabel('Frequency (Rad/s)')
ylabel('Phase (deg)')
grid on
axis([Wmin Wmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
else
subplot(2,1,1)
mag=20*log10(abs(Xfer));
plot(F,mag)
xlabel('Frequency (Hz)')
ylabel('Mag (dB)')
grid on
axis([Fmin Fmax minmag maxmag])
zoom on
subplot(2,1,2)
plot(F,phase)
xlabel('Frequency (Hz)')
ylabel('Phase (deg)')
grid on
phmin_max=[floor(min(phase)/45)*45 ceil(max(phase)/45)*45];
axis([Fmin Fmax phmin_max(1) phmin_max(2)])
gridmin_max=round(phmin_max/90)*90;
set(gca,'YTick',gridmin_max(1):90:gridmin_max(2))
zoom on
end