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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 f=%p_p_s(p,s)
// %p_p_s(p,s) computes p^s for p polynomial matrix in special cases
//!
if s==[] then f=[],return,end
if or(imag(s)<>0)|or(int(s)<>s) then error(msprintf(_("%s: Wrong type for input argument #%d: An integer matrix expected.\n"),"%p_p_s",2)),end
[m,n]=size(p)
[ms,ns]=size(s)
if ms==1&ns==1 then
if m==1|n==1 then //Element wise exponentiation p.^s with p vector
if s<0 then
if or(abs(coeff(p(:)))*ones(max(degree(p))+1,1)==0) then
error(27)
end
f = rlist(ones(p),p.^(-s),[])
else // this case is in fact hard coded
f=p.^s
end
elseif m==n then //square matrix exponentiation p^s
if s<0 then
f=invr(p),
s=-s;
f1=f;for k=2:s,f=f*f1;end
else
f=p
for k=2:s,f=f*p;end
end
else
error(20,1)
end
elseif ms==1|ns==1 then // Element wise exponentiation f.^s with f "scalar"
if m<>1|n<>1 then error(43),end
kp=find(s>=0)
kn=find(s<0)
num=ones(s)
den=ones(s)
num(kp)=p.^s(kp)
if abs(coeff(p))*ones(degree(p)+1,1)==0 then
error(27)
end
den(kn)=p.^(-s(kn))
f = rlist(num,den,[])
else
error(43)
end
endfunction
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