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c Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
c Copyright (C) 1985-2008 - INRIA - Carlos KLIMANN
c
c This file must be used under the terms of the CeCILL.
c This source file is licensed as described in the file COPYING, which
c you should have received as part of this distribution. The terms
c are also available at
c http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
C/MEMBR ADD NAME=DPMUL,SSI=0
c Copyright INRIA
subroutine dpmul(p1,d1,p2,d2,p3,d3)
c!purpose
c ce sous programme effectue le calcul:
c
c p3(x) = p3(x) + (p1(x) * p2(x))
c
c ou p1, p2 et p3 sont des polynomes de degres d1, d2 et d3,
c respectivement. Ils sont classes en ordre croissant.
c Tous les parametres sont d'entree, sauf p3 et d3 qui sont
c d'entree-sortie.
c!
c &&var
implicit double precision (a-h,o-z)
double precision dlamch,ddot
double precision p1(*),p2(*),p3(*)
integer d1,d2,d3
integer dmax,dmin,dsum
integer i, k, j, l
integer e1, e2
eps=dlamch('p')
c &&ker
dsum = d1 + d2
c fixation de dmax et dmin
dmax = d1
if (d2 .gt. d1) dmax = d2
dmin = dsum - dmax
c fixation de d3
if (d3 .ge. dsum) goto 1
e1 = d3+2
e2 = dsum +1
do 2 i = e1 , e2
p3(i) = 0.0d+0
2 continue
d3 = dsum
1 continue
c cas des degres egaux a zero
if (d1 .eq. 0 .or. d2 .eq. 0) goto 53
c produit et addition
e1 = 1
e2 = dmin + 1
do 10 i = e1, e2
w=ddot(i,p1(1),1,p2(1),-1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
10 continue
k = 1
if (d1 .eq. d2) goto 21
e1 = dmin + 2
e2 = dmax + 1
c si d1 > d2
if (d1 .lt. d2) goto 25
do 20 i = e1, e2
k = k + 1
w=ddot(dmin+1, p1(k), 1, p2(1), -1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
20 continue
21 e1 = dmax + 2
e2 = dsum + 1
l = 1
j = dmin + 1
do 40 i = e1, e2
j = j -1
k = k + 1
l =l + 1
w=ddot(j, p1(k), 1, p2(l), -1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
40 continue
return
c si d2 > d1
25 do 30 i = e1, e2
k = k + 1
w=ddot(dmin+1, p2(k), -1, p1(1), 1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
30 continue
e1 = dmax + 2
e2 = dsum + 1
l = 1
j = dmin + 1
do 50 i = e1, e2
j = j -1
k = k + 1
l =l + 1
w=ddot(j, p1(l), 1, p2(k), -1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
50 continue
return
c cas des degres egaux a zero
53 if (d1 .eq. 0 .and. d2 .eq. 0) goto 100
e1 = 1
if (d1 .eq.0) goto 60
e2 = d1 + 1
do 55 i = e1, e2
w=p1(i) * p2(1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
55 continue
return
60 e2 = d2 + 1
do 65 i = e1, e2
w=p2(i) * p1(1)
w1=p3(i)+w
if(abs(w1).gt.eps*max(abs(p3(i)),abs(w))) then
p3(i) = w1
else
p3(i)=0.0d+0
endif
65 continue
return
100 p3(1) = p3(1) + p1(1) * p2(1)
return
end
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