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subroutine wipowe(vr,vi,p,rr,ri,ierr)
c!purpose
c computes v^p with v complex and p integer
c!calling sequence
c subroutine wipowe(vr,vi,p,rr,ri,ierr)
c integer ierr
c double precision vr,vi,p,rr,ri
c vr : real part of v
c vi : imaginary part of v
c rr : result's real part
c ri : result's imaginary part
c ierr : error flag
c ierr=0 if ok
c ierr=1 if 0**0
c ierr=2 if 0**k with k<0
c!origin
c Serge Steer INRIA 1996
c!
c Copyright INRIA
integer p,ierr
double precision vr,vi,xr,xi,rr,ri
c
ierr=0
c
if(p.eq.0) then
rr=1.0d+0
ri=0.0d+0
elseif(p.lt.0) then
if(abs(vr)+abs(vi).ne.0.0d+0) then
call wdiv(1.0d+0,0.0d+0,vr,vi,rr,ri)
xr=rr
xi=ri
do 10 k=2,abs(p)
call wmul(xr,xi,rr,ri,rr,ri)
10 continue
else
ri=0.0d0
rr=1.0d0/ri
ierr=2
endif
else
rr=vr
ri=vi
xr=rr
xi=ri
do 20 k=2,abs(p)
call wmul(xr,xi,rr,ri,rr,ri)
20 continue
endif
return
end
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