Initial commit

2016-02-03 18:52:05 +00:00
commit d40505e161
507 changed files with 91383 additions and 0 deletions
@@ -0,0 +1,34 @@
+      SUBROUTINE spline(x,y,n,yp1,ypn,y2)
+      INTEGER n,NMAX
+      REAL yp1,ypn,x(n),y(n),y2(n)
+      PARAMETER (NMAX=500)
+      INTEGER i,k
+      REAL p,qn,sig,un,u(NMAX)
+      if (yp1.gt..99e30) then
+        y2(1)=0.
+        u(1)=0.
+      else
+        y2(1)=-0.5
+        u(1)=(3./(x(2)-x(1)))*((y(2)-y(1))/(x(2)-x(1))-yp1)
+      endif
+      do 11 i=2,n-1
+        sig=(x(i)-x(i-1))/(x(i+1)-x(i-1))
+        p=sig*y2(i-1)+2.
+        y2(i)=(sig-1.)/p
+        u(i)=(6.*((y(i+1)-y(i))/(x(i+
+     *1)-x(i))-(y(i)-y(i-1))/(x(i)-x(i-1)))/(x(i+1)-x(i-1))-sig*
+     *u(i-1))/p
+11    continue
+      if (ypn.gt..99e30) then
+        qn=0.
+        un=0.
+      else
+        qn=0.5
+        un=(3./(x(n)-x(n-1)))*(ypn-(y(n)-y(n-1))/(x(n)-x(n-1)))
+      endif
+      y2(n)=(un-qn*u(n-1))/(qn*y2(n-1)+1.)
+      do 12 k=n-1,1,-1
+        y2(k)=y2(k)*y2(k+1)+u(k)
+12    continue
+      return
+      END