subroutine fpbisp(tx,nx,ty,ny,c,kx,ky,x,mx,y,my,z,wx,wy,lx,ly)
c ..scalar arguments..
integer nx,ny,kx,ky,mx,my
c ..array arguments..
integer lx(mx),ly(my)
real tx(nx),ty(ny),c((nx-kx-1)*(ny-ky-1)),x(mx),y(my),z(mx*my),
* wx(mx,kx+1),wy(my,ky+1)
c ..local scalars..
integer kx1,ky1,l,l1,l2,m,nkx1,nky1
real arg,sp,tb,te
c ..local arrays..
real h(6)
c ..subroutine references..
c fpbspl
c ..
kx1 = kx+1
nkx1 = nx-kx1
tb = tx(kx1)
te = tx(nkx1+1)
l = kx1
l1 = l+1
do 40 i=1,mx
arg = x(i)
if(arg.lt.tb) arg = tb
if(arg.gt.te) arg = te
10 if(arg.lt.tx(l1) .or. l.eq.nkx1) go to 20
l = l1
l1 = l+1
go to 10
20 call fpbspl(tx,nx,kx,arg,l,h)
lx(i) = l-kx1
do 30 j=1,kx1
wx(i,j) = h(j)
30 continue
40 continue
ky1 = ky+1
nky1 = ny-ky1
tb = ty(ky1)
te = ty(nky1+1)
l = ky1
l1 = l+1
do 80 i=1,my
arg = y(i)
if(arg.lt.tb) arg = tb
if(arg.gt.te) arg = te
50 if(arg.lt.ty(l1) .or. l.eq.nky1) go to 60
l = l1
l1 = l+1
go to 50
60 call fpbspl(ty,ny,ky,arg,l,h)
ly(i) = l-ky1
do 70 j=1,ky1
wy(i,j) = h(j)
70 continue
80 continue
m = 0
do 130 i=1,mx
l = lx(i)*nky1
do 90 i1=1,kx1
h(i1) = wx(i,i1)
90 continue
do 120 j=1,my
l1 = l+ly(j)
sp = 0.
do 110 i1=1,kx1
l2 = l1
do 100 j1=1,ky1
l2 = l2+1
sp = sp+c(l2)*h(i1)*wy(j,j1)
100 continue
l1 = l1+nky1
110 continue
m = m+1
z(m) = sp
120 continue
130 continue
return
end