subroutine setdat(icount)
c from * a practical guide to splines * by c. de boor
c to be called in main program l 2 m a i n .
c this routine is set up to provide the specific data for example 2
c in chapter xiv. for a general purpose l2-approximation program, it
c would have to be replaced by a subroutine reading in
c ntau, tau(i), gtau(i), i=1,...,ntau
c and reading in or setting
c k, l, break(i),i=1,...,l+1, and weight(i),i=1,...,ntau,
c as well as totalw = sum( weight(i) , i=1,...,ntau).
c i c o u n t is equal to zero when setdat is called in l 2 m a i n
c for the first time. after that, it is up to setdat to use icount
c for keeping track of the passes through setdat . this is important
c since l2main relies on setdat for t e r m i n a t i o n .
integer icount, i,k,l,lp1,ntau,ntaum1
real break,coef,gtau,step,tau,totalw,weight
parameter lpkmax=100,ntmax=200,ltkmax=2000
common / data / ntau, tau(ntmax),gtau(ntmax),weight(ntmax),totalw
common /approx/ break(lpkmax),coef(ltkmax),l,k
C common / data / ntau, tau(200),gtau(200),weight(200),totalw
C common /approx/ break(100),coef(2000),l,k
if (icount .gt. 0) stop
icount = icount + 1
ntau = 10
ntaum1 = ntau-1
do 8 i=1,ntaum1
8 tau(i) = 1. - .5**(i-1)
tau(ntau) = 1.
do 9 i=1,ntau
9 gtau(i) = tau(i)**2 + 1.
do 10 i=1,ntau
10 weight(i) = 1.
totalw = ntau
l = 6
lp1 = l+1
step = 1./float(l)
k = 2
do 11 i=1,lp1
11 break(i) = (i-1)*step
return
end