Initial commit

2016-02-03 18:52:05 +00:00
commit d40505e161
507 changed files with 91383 additions and 0 deletions
@@ -0,0 +1,22 @@
+      SUBROUTINE trapzd(func,a,b,s,n)
+      INTEGER n
+      REAL a,b,s,func
+      EXTERNAL func
+      INTEGER it,j
+      REAL del,sum,tnm,x
+      if (n.eq.1) then
+        s=0.5*(b-a)*(func(a)+func(b))
+      else
+        it=2**(n-2)
+        tnm=it
+        del=(b-a)/tnm
+        x=a+0.5*del
+        sum=0.
+        do 11 j=1,it
+          sum=sum+func(x)
+          x=x+del
+11      continue
+        s=0.5*(s+(b-a)*sum/tnm)
+      endif
+      return
+      END