Mercurial > hg > octave-terminal
changeset 3412:0848897e30c8
[project @ 2000-01-07 16:54:59 by hodelas]
sysmin now handles systems with both continuous and discrete states.
author | hodelas |
---|---|
date | Fri, 07 Jan 2000 16:54:59 +0000 |
parents | 7c203c3033f6 |
children | 604ede10160f |
files | scripts/control/sysmin.m |
diffstat | 1 files changed, 123 insertions(+), 47 deletions(-) [+] |
line wrap: on
line diff
--- a/scripts/control/sysmin.m +++ b/scripts/control/sysmin.m @@ -42,60 +42,136 @@ otherwise, usage("[retsys,nc,no] = sysmin(sys{,flg})"); endswitch - dflg = is_digital(sys,flg); - Ts = sysgettsam(sys); - switch(flg) - case(0), - ## reduce to a minimal system - [aa,bb,cc,dd] = sys2ss(sys); - [cflg,Uc] = is_controllable(aa,bb); - if(!cflg) - ## reduce to controllable states - if(!isempty(Uc)) - aa = Uc'*aa*Uc; - bb = Uc'*bb; - cc = cc*Uc; + dflg = is_digital(sys,2); + [n,nz,m,p] = sysdimensions(sys); + if(n*nz > 0) + # both continuous and discrete states + [aa,bb,cc,dd,tsam,n,nz,stnam,innam,outnam,yd] = sys2ss(sys); + crng = 1:n; + drng = n+(1:nz); + + # get minimal realization of continuous part + Ac = aa(crng,crng); + Acd = aa(crng,drng); + Adc = aa(drng,crng); + Ad = aa(drng,drng); + Bc = bb(crng,:); + Bd = bb(drng,:); + Cc = cc(:,crng); + Cd = cc(:,drng); + + cstnam = stnam(crng); + dstnam = stnam(drng); + cinnam = append(innam,stnam(drng)); + coutnam = append(outnam,stnam(drng)); + csys = ss2sys(Ac,[Bc,Acd],[Cc;Adc]); + csys = syssetsignals(csys,"st",cstnam); + csys = syssetsignals(csys,"in",cinnam); + csys = syssetsignals(csys,"out",coutnam); + + # reduce continuous system, recombine with discrete part + csys = sysmin(csys,flg); + cn = sysdimensions(csys); + + if(cn == 0) + # continuous states are removed; just reduce the discrete part + sys = sysprune(sys,1:p,1:m,drng); + retsys = sysmin(sys,flg); + else + # extract updated parameters from reduced continuous system + [caa,cbb,ccc,cdd,ctsam,cn,cnz,cstnam,cinnam,coutnam] = sys2ss(csys); + crng = 1:cn; + Ac = caa; + Bc = cbb(:,1:m); + Acd = cbb(:,m+(1:nz)); + Cc = ccc(1:p,:); + Adc = ccc(p + (1:nz),:); + + # recombine to reduce discrete part of the system + dinnam = append(innam,cstnam); + doutnam = append(outnam,cstnam); + dsys = ss2sys(Ad,[Bd,Adc],[Cd;Acd],[],tsam); + dsys = syssetsignals(dsys,"st",dstnam); + dsys = syssetsignals(dsys,"in",dinnam); + dsys = syssetsignals(dsys,"out",doutnam); + + # reduce discrete subsystem + dsys = sysmin(dsys); + [n1,nz] = sysdimensions(dsys); + if(nz == 0) + # discrete subsystem is not needed + retsys = sysprune(csys,1:p,1:m); else - aa = bb = cc = []; - endif + # combine discrete, continuous subsystems + [Ad,dbb,dcc] = sys2ss(dsys); + dstnam = sysgetsignals(dsys,"st"); + Bd = dbb(:,1:m); + Adc = dbb(:,m+(1:cn)); + Cd = dcc(1:p,:); + Acd = dcc(p+(1:cn),:); + stnam = append(cstnam,dstnam); + aa = [Ac, Acd; Adc, Ad]; + bb = [Bc; Bd]; + cc = [Cc, Cd]; + retsys = ss2sys([Ac, Acd; Adc, Ad], [Bc ; Bd], [Cc, Cd], dd, tsam, ... + cn, nz, stnam, innam, outnam, find(yd == 1)); + end endif - if(!isempty(aa)) - [oflg,Uo] = is_observable(aa,cc); - if(!oflg) - if(!isempty(Uo)) - aa = Uo'*aa*Uo; - bb = Uo'*bb; - cc = cc*Uo; + else + Ts = sysgettsam(sys); + switch(flg) + case(0), + ## reduce to a minimal system + [aa,bb,cc,dd] = sys2ss(sys); + [cflg,Uc] = is_controllable(aa,bb); + if(!cflg) + ## reduce to controllable states + if(!isempty(Uc)) + aa = Uc'*aa*Uc; + bb = Uc'*bb; + cc = cc*Uc; else aa = bb = cc = []; endif endif - endif - switch(dflg) - case(0), - nc = no = nn = columns(aa); - nz = 0; + if(!isempty(aa)) + [oflg,Uo] = is_observable(aa,cc); + if(!oflg) + if(!isempty(Uo)) + aa = Uo'*aa*Uo; + bb = Uo'*bb; + cc = cc*Uo; + else + aa = bb = cc = []; + endif + endif + endif + switch(dflg) + case(0), + nc = no = nn = columns(aa); + nz = 0; + case(1), + nc = no = nz = columns(aa); + nn = 0; + endswitch + innam = sysgetsignals(sys,"in"); + outnam= sysgetsignals(sys,"out"); + retsys = ss2sys(aa,bb,cc,dd,Ts,nn,nz,[],innam,outnam); case(1), - nc = no = nz = columns(aa); - nn = 0; + ## reduced model with physical states + [cflg,Uc] = is_controllable(sys); xc = find(max(abs(Uc')) != 0); + [oflg,Uo] = is_observable(sys); xo = find(max(abs(Uo')) != 0); + xx = intersection(xc,xo); + if(isempty(xx)) xx = 0; endif # signal no states in reduced model + retsys = sysprune(sys,[],[],xx); + otherwise, + error("illegal value of flg=%d",flg); endswitch - inname = sysgetsignals(sys,"in"); - outname= sysgetsignals(sys,"out"); - retsys = ss2sys(aa,bb,cc,dd,Ts,nn,nz,[],inname,outname); - case(1), - ## reduced model with physical states - [cflg,Uc] = is_controllable(sys); xc = find(max(abs(Uc')) != 0); - [oflg,Uo] = is_observable(sys); xo = find(max(abs(Uo')) != 0); - xx = intersection(xc,xo); - if(isempty(xx)) xx = 0; endif # signal no states in reduced model - retsys = sysprune(sys,[],[],xx); - otherwise, - error("illegal value of flg=%d",flg); - endswitch - if(sysdimensions(retsys,"st") > 0) - [cflg,Uc] = is_controllable(retsys); nc = columns(Uc); - [oflg,Uo] = is_observable(retsys); no = columns(Uo); - else - nc = no = 0; + if(sysdimensions(retsys,"st") > 0) + [cflg,Uc] = is_controllable(retsys); nc = columns(Uc); + [oflg,Uo] = is_observable(retsys); no = columns(Uo); + else + nc = no = 0; + endif endif endfunction