home *** CD-ROM | disk | FTP | other *** search
- function ffplot(G,sd,C,mode)
- %FFPLOT Plots frequency functions
- %
- % ffplot(G) or ffplot(G,SD)
- %
- % The syntax is identical to that of BODEPLOT
- % FFPLOT plots frequency functions with linear frequency scales
- % and uses Hz as the frequency unit.
- % BODEPLOT gives logarithmic frequency scales and uses rad/sec as the
- % frequency unit.
-
- % L. Ljung 10-4-90,2-10-92
- % Copyright (c) 1990-92 by the MathWorks, Inc.
- % All Rights Reserved.
-
- if nargin<4 , mode=[];end
- if nargin<3, C=[];end
- if nargin<2, sd=[];end
- if isempty(mode),mode='sep';end
- if isempty(C),C='B';end
- if isempty(sd),sd=0;end
-
- abp=['a';'A';'b';'B';'p';'P'];
- if sum(sd(1)==abp)>0, if length(C)>1,mode=C;end,C=sd;sd=0;end
- if length(sd)>1,mode=sd;sd=0;end
-
- mode=mode(1:3);
- if mode=='SEP', mode='sep';end
- if mode=='SAM', mode='sam';end
- if mode~='sam', mode='sep';end
-
- if C == 'a', C='A'; end
- if C == 'p', C='P'; end
- if C == 'b', C='B'; end
-
- [m,n]=size(G);
- inputs1=G(1,:);mo=fix(inputs1/1000);mmo=max(mo);
- kko=[]; % The output indices
- for k=[0:mmo],if length(find(mo==k))>0,kko=[kko k];end,end
- G=G(2:m,:);
- for ko=kko+1
-
- inputs=inputs1-(ko-1)*1000;
- mi=max(inputs(find(inputs<19)));
-
- kki=[]; % The input indices
- for k=[1:mi 0], if length(find(inputs==k))>0,kki=[kki k];end,end
- if sum(kki)==0 & C=='B', C='A';end
- if mode=='sep'
- for k=kki
- if k==0 & C=='B',C='A';end
- if C=='B',subplot(211),else subplot(111),end
- if C=='A'| C=='B'
-
- semilogy(G(:,find(inputs==100+k))/2/pi,G(:,find(inputs==k)))
- if sd>0,hold on,
- ind=find(k+50==inputs);
- semilogy(G(:,ind-2)/2/pi,G(:,ind-1)+sd*G(:,ind),'-.')
- semilogy(G(:,ind-2)/2/pi,G(:,ind-1)-sd*G(:,ind),'-.') %Change here 2.04
- hold off,end
- xlabel('frequency (Hz)')
-
- if k~=0,title(['AMPLITUDE PLOT, input # ',int2str(k),' output # ',int2str(ko)])
- else title(['SPECTRUM output # ',int2str(ko)]),end
- end
- if ((C=='B')|(C=='P'))&k~=0
- if (C=='B'), subplot(212), end
- if (C=='P'),subplot(111),end
-
- plot(G(:,find(inputs==100+k))/2/pi,G(:,find(inputs==20+k)))
- if sd>0,hold on,
- ind=find(k+70==inputs);
- plot(G(:,ind-4)/2/pi,G(:,ind-1)+G(:,ind)*sd,'-.')
- plot(G(:,ind-4)/2/pi,G(:,ind-1)-sd*G(:,ind),'-.') %Change here 2.04
- hold off,end
- title(['PHASE PLOT, input # ',int2str(k),' output # ',int2str(ko)])
- xlabel('frequency (Hz)')
- ylabel('phase')
- end
-
-
- if k~=kki(length(kki)),pause,end
- end
- end
- if mode=='sam'
-
- if C=='B',subplot(211),else subplot(111),end
- if C=='B' | C=='A'
- semilogy(G(:,find(inputs>99&inputs<120))/2/pi,G(:,find(inputs<20&inputs>-1)))
- if sd>0,hold on,
- ind=find(inputs<69 & inputs>49);
- semilogy(G(:,ind-2)/2/pi,G(:,ind-1)+G(:,ind)*sd,'-.')
- semilogy(G(:,ind-2)/2/pi,G(:,ind-1)-sd*G(:,ind),'-.'),hold off,end
- xlabel('frequency (Hz)')
- title(['AMPLITUDE PLOT output #',int2str(ko)])
- end
- if C=='B'| C=='P'
- if C=='B',subplot(212),else subplot(111),end
- plot(G(:,find(inputs>100&inputs<120))/2/pi,G(:,find(inputs<39 & inputs>19)))
- if sd>0,hold on
- ind=find(inputs<89 & inputs>69);
- plot(G(:,ind-4)/2/pi,G(:,ind-1)+G(:,ind)*sd,'-.')
- plot(G(:,ind-4)/2/pi,G(:,ind-1)-sd*G(:,ind),'-.'),hold off,end
- xlabel('frequency (Hz)')
- ylabel('phase')
- title(['PHASE PLOT output #',int2str(ko)])
- end
-
- end,if ko~=kko(length(kko))+1,pause,end
-
- end
-
- hold off
- set(gcf,'NextPlot','replace');
-
-