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function []=bode(sl,fmin,fmax,pas,comments)
//!
// Copyright INRIA
[lhs,rhs]=argn(0);
dom='c';
//---------------------
nyq_frq=[];l10=log(10);
pas_def='auto' // default
ilf=0
typ=type(sl)
//-compat next line added for list/tlist compatibility
if typ==15 then typ=16,end
select typ
case 16 then // sl,fmin,fmax [,pas] [,comments]
typ=sl(1);typ=typ(1);
if typ<>'lss'&typ<>'r' then
error(97,1)
end
if typ=='lss' then
if sl(7)==[] then error('Undefined time domain (sl(7))');end
end
if typ=='r' then
if sl(4)==[] then error('Undefined time domain (sl(4))');end
end
dom=sl('dt')
if dom==[]|dom==0 then error(96,1),end
if dom=='d' then dom=1;end
select rhs
case 1 then //sl
comments=' '
fmin_default=1.d-3;
fmax_default=1.d3;
if dom=='c' then fmax_default=1.d3; else fmax_default=1/(2*dom),end
[frq,repf]=repfreq(sl,fmin_default,fmax_default);
[d,phi]=dbphi(repf);
sl=[]
case 2 then // sl,frq
comments=' '
if min(fmin)<=0 then
error('bode: requires strictly positive frequency vector')
end
[frq,repf]=repfreq(sl,fmin);
[d,phi]=dbphi(repf);
fmin=[];sl=[]
case 3 , //sl,frq,comments ou sl,fmin,fmax
if type(fmax)==1 then
comments=' '
if fmin<=0 then
error('bode: requires strictly positive frequency range')
end
[frq,repf]=repfreq(sl,fmin,fmax,pas_def),sl=[]
[d,phi]=dbphi(repf);
else
comments=fmax
if min(fmin)<=0 then
error('bode: requires strictly positive frequency vector')
end
if type(dom)==1 then nyq_frq=1/2/dom;end
if find(fmin>nyq_frq)~=[] then
warning('There are frequencies beyond Nyquist f!');
end
[frq,repf]=repfreq(sl,fmin);fmin=[];sl=[]
[d,phi]=dbphi(repf);
end
case 4 ,
if type(pas)==1 then
comments=' ',
else
comments=pas;pas=pas_def;
end,
if min(fmin)<=0 then
error('bode: requires strictly positive frequency vector')
end
[frq,repf]=repfreq(sl,fmin,fmax,pas)
[d,phi]=dbphi(repf);
case 5 then,
if min(fmin)<=0 then
error('bode: requires strictly positive frequency vector')
end
[frq,repf]=repfreq(sl,fmin,fmax,pas)
[d,phi]=dbphi(repf);
else
error('Invalid call: sys,fmin,fmax [,pas] [,com]')
end;
case 1 then //frq,db,phi [,comments] ou frq, repf [,comments]
select rhs
case 2 , //frq,repf
comments=' '
[phi,d]=phasemag(fmin);fmin=[]
case 3 then
if type(fmax)==1 then
comments=' '//frq db phi
d=fmin,fmin=[]
phi=fmax,fmax=[]
else
[phi,d]=phasemag(fmin);fmin=[]
comments=fmax
end;
case 4 then
comments=pas;d=fmin;fmin=[];phi=fmax;fmax=[]
else
error('Invalid call: frq,db,phi,[com] or frq,repf,[com]')
end;
frq=sl;sl=[];[mn,n]=size(frq);
if min(frq)<=0 then
error('bode: requires strictly positive frequencies')
end
if mn<>1 then
ilf=1;//un vecteur de frequences par reponse
else
ilf=0;//un seul vecteur de frequence
end;
else
error('Bode: invalid call')
end;
[mn,n]=size(phi)
//
//Captions
if comments==' ' then
comments(mn)=' ';
mnc=0
hx=0.48
else
mnc=mn
hx=0.43
end;
[ffr,bds]=xgetech();
//magnitude
xsetech([0,0,1.0,hx*0.95]);
rect=[mini(frq),mini(d),maxi(frq),maxi(d)]
// just to fix the scales for xgrid
plot2d1("oln",mini(frq),mini(d),0,"051"," ",rect);
// xgrid first
xgrid(4);
// now the curves
plot2d1("oln",frq',d',[1:mn],"000"," ",rect);
if type(dom)==1 then
[xx1,xx2]=xgetech();
val= xx2([2;4])';
plot2d1("oln",max(frq)*[1;1],val,5,"000"," ",rect);
end
xtitle('Magnitude ',' Hz','db');
//phase
xsetech([0,hx,1.0,hx*0.95]);
rect=[mini(frq),mini(phi),maxi(frq),maxi(phi)]
// just to fix the scales for xgrid
plot2d1("oln",mini(frq),mini(phi),0,"051"," ",rect);
xgrid(4);
// now the curves
plot2d1("oln",frq',phi',[1:mn],"000");
if type(dom)==1 then
[xx1,xx2]=xgetech();
val= xx2([2;4])';
plot2d1("oln",max(frq)*[1;1],val,5,"000");
end
xtitle('Phase ',' Hz','degrees');
if mnc>0 then
xsetech([0,2*hx,1.0,0.1],[0 0 1 1]);
dash=xget('dashes')
y0=0.7;dy=-1/2
x0=0;dx=1/2
count=0
for k=1:mnc
xset('dashes',k)
xsegs([x0;x0+0.08],[y0;y0])
rect=xstringl(x0+0.1,y0,comments(k))
xset('dashes',dash(1));
xstring(x0+0.1,y0-rect(4)/3,comments(k))
count=count+1
y0=y0+dy
if count==3 then x0=x0+dx;y0=0.7,end
end
xset('dashes',dash(1))
end
xsetech(ffr,bds);
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