File: invsyslin.sci

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function it=invsyslin(t)

// Copyright INRIA

if type(t)<>16 then error(91,1),end
flag=t(1);
if flag(1) <> 'lss' then error(91,1),end;
[p,m]=size(t(5));
if p <> m then  warning('non square D matrix'),end
//
d=pinv(t(5));
a=t(2)-t(3)*d*t(4);
b=t(3)*d;
c=-d*t(4);
it=syslin(t(7),a,b,c,d,t(6));