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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
function x=%sp_l_s(a,b)
// a\b , a sparse b full
[ma,na]=size(a)
[mb,nb]=size(b)
if mb*nb==1 then x=a\(b*speye(na,na)),return;end
if ma<>mb then error(12),end
if ma<>na then b=a'*b;a=a'*a;end
if isreal(a)&isreal(b) then
[h,rk]=lufact(a)
if rk<min(ma,na) then warning("deficient rank: rank = "+string(rk)),end
x=[]
for k=1:nb
x=[x,lusolve(h,b(:,k))]
end
ludel(h)
else
[h,rk]=lufact([real(a) -imag(a);imag(a) real(a)])
if rk<2*min(ma,na) then warning("deficient rank: rank = "+string(rk/2)),end
x=[]
for k=1:nb
x=[x,lusolve(h,[real(b(:,k));imag(b(:,k))])]
end
x=x(1:$/2,:)+%i*x($/2+1:$,:)
ludel(h)
end
endfunction
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