comp3.f
1.61 KB
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subroutine comp3 (fn, dfn, xstart, xend, xincr, ystart, yend,
1 yincr, zstart, zend, zincr, fname)
c august 1979 edition. w. fullerton, c3, los alamos scientific lab.
double precision dfn, xstart, xend, xincr, ystart, yend, yincr,
1 zstart, zend, zincr, dx, dy, dz, df
integer fname(1), fmt(23)
external fn, dfn, i1mach
c
call s9comp (48, fmt, nwd)
iwunit = i1mach(2)
write (iwunit, 5)
5 format (1h1)
write (iwunit, fmt) (fname(i), i=1,nwd), (fname(i), i=1,nwd)
write (iwunit, 10)
10 format (1h+, 8x, 1hx, 12x, 1hy, 12x, 1hz, 69x, 4haerr, 7x, 4hrerr)
c
aerrmx = 0.0
rerrmx = 0.0
do 50 i=1,11
dx = xstart + dble(float(i-1))*xincr
if (dx.gt.xend) go to 60
c
do 40 j=1,11
dy = ystart + dble(float(j-1))*yincr
if (dy.gt.yend) go to 50
c
write (iwunit, 20)
do 30 k=1,11
dz = zstart + dble(float(k-1))*zincr
if (dz.gt.zend) go to 40
c
x = dx
y = dy
z = dz
f = fn (x, y, z)
df = dfn (dble(x), dble(y), dble(z))
aerr = df - dble(f)
rerr = 0.0
if (df.ne.0.0d0) rerr = abs (aerr/sngl(df))
c
aerrmx = amax1 (abs(aerr), aerrmx)
rerrmx = amax1 (rerr, rerrmx)
df = dfn (dx, dy, dz)
c
write (iwunit, 20) x, y, z, f, df, aerr, rerr
20 format (1x, 3e13.5, e22.14, d36.28, 2x, 2e11.3)
30 continue
40 continue
50 continue
c
60 write (iwunit, 70) aerrmx, rerrmx
70 format (/100x, 2e11.3)
c
return
end