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subroutine wdpowe(vr,vi,p,rr,ri,ierr)
c!purpose
c computes v^p with v complex and p real
c!calling sequence
c subroutine wdpowe(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 ierr
double precision vr,vi,p,sr,si,rr,ri
c
ierr=0
c
if(dble(int(p)).eq.p) then
call wipowe(vr,vi,int(p),rr,ri,ierr)
else
if(abs(vr)+abs(vi).ne.0.0d+0) then
call wlog(vr,vi,sr,si)
sr=exp(sr*p)
si=si*p
rr=sr*cos(si)
ri=sr*sin(si)
else
if(p.gt.0.0d+0) then
rr=0.0d+0
ri=0.0d+0
elseif(p.lt.0.0d+0) then
ri=0.0d+0
rr=1.0d0/ri
ierr=2
else
rr=1.0d+0
ri=0.0d+0
endif
endif
endif
c
return
end
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