bie.f
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function bie (x)
c july 1977 edition. w. fullerton, c3, los alamos scientific lab.
c
c evaluate bi(x) for x .le. 0 and bi(x)*exp(-zeta) where
c zeta = 2/3 * x**(3/2) for x .ge. 0.0
c
dimension bifcs(9), bigcs(8), bif2cs(10), big2cs(10), bipcs(24),
1 bip2cs(29)
external csevl, inits, r1mach
c
c series for bif on the interval -1.00000d+00 to 1.00000d+00
c with weighted error 1.88e-19
c log weighted error 18.72
c significant figures required 17.74
c decimal places required 19.20
c
data bif cs( 1) / -.0167302164 7198664948e0 /
data bif cs( 2) / .1025233583 424944561e0 /
data bif cs( 3) / .0017083092 5073815165e0 /
data bif cs( 4) / .0000118625 4546774468e0 /
data bif cs( 5) / .0000000449 3290701779e0 /
data bif cs( 6) / .0000000001 0698207143e0 /
data bif cs( 7) / .0000000000 0017480643e0 /
data bif cs( 8) / .0000000000 0000020810e0 /
data bif cs( 9) / .0000000000 0000000018e0 /
c
c series for big on the interval -1.00000d+00 to 1.00000d+00
c with weighted error 2.61e-17
c log weighted error 16.58
c significant figures required 15.17
c decimal places required 17.03
c
data big cs( 1) / .0224662232 4857452e0 /
data big cs( 2) / .0373647754 5301955e0 /
data big cs( 3) / .0004447621 8957212e0 /
data big cs( 4) / .0000024708 0756363e0 /
data big cs( 5) / .0000000079 1913533e0 /
data big cs( 6) / .0000000000 1649807e0 /
data big cs( 7) / .0000000000 0002411e0 /
data big cs( 8) / .0000000000 0000002e0 /
c
c series for bif2 on the interval 1.00000d+00 to 8.00000d+00
c with weighted error 1.11e-17
c log weighted error 16.95
c approx significant figures required 16.5
c decimal places required 17.45
c
data bif2cs( 1) / 0.0998457269 3816041e0 /
data bif2cs( 2) / .4786249778 63005538e0 /
data bif2cs( 3) / .0251552119 604330118e0 /
data bif2cs( 4) / .0005820693 885232645e0 /
data bif2cs( 5) / .0000074997 659644377e0 /
data bif2cs( 6) / .0000000613 460287034e0 /
data bif2cs( 7) / .0000000003 462753885e0 /
data bif2cs( 8) / .0000000000 014288910e0 /
data bif2cs( 9) / .0000000000 000044962e0 /
data bif2cs(10) / .0000000000 000000111e0 /
c
c series for big2 on the interval 1.00000d+00 to 8.00000d+00
c with weighted error 1.19e-18
c log weighted error 17.92
c approx significant figures required 17.2
c decimal places required 18.42
c
data big2cs( 1) / .0333056621 45514340e0 /
data big2cs( 2) / .1613092151 23197068e0 /
data big2cs( 3) / .0063190073 096134286e0 /
data big2cs( 4) / .0001187904 568162517e0 /
data big2cs( 5) / .0000013045 345886200e0 /
data big2cs( 6) / .0000000093 741259955e0 /
data big2cs( 7) / .0000000000 474580188e0 /
data big2cs( 8) / .0000000000 001783107e0 /
data big2cs( 9) / .0000000000 000005167e0 /
data big2cs(10) / .0000000000 000000011e0 /
c
c series for bip on the interval 1.25000d-01 to 3.53553d-01
c with weighted error 1.91e-17
c log weighted error 16.72
c significant figures required 15.35
c decimal places required 17.41
c
data bip cs( 1) / -.0832204747 7943447e0 /
data bip cs( 2) / .0114611892 7371174e0 /
data bip cs( 3) / .0004289644 0718911e0 /
data bip cs( 4) / -.0001490663 9379950e0 /
data bip cs( 5) / -.0000130765 9726787e0 /
data bip cs( 6) / .0000063275 9839610e0 /
data bip cs( 7) / -.0000004222 6696982e0 /
data bip cs( 8) / -.0000001914 7186298e0 /
data bip cs( 9) / .0000000645 3106284e0 /
data bip cs(10) / -.0000000078 4485467e0 /
data bip cs(11) / -.0000000009 6077216e0 /
data bip cs(12) / .0000000007 0004713e0 /
data bip cs(13) / -.0000000001 7731789e0 /
data bip cs(14) / .0000000000 2272089e0 /
data bip cs(15) / .0000000000 0165404e0 /
data bip cs(16) / -.0000000000 0185171e0 /
data bip cs(17) / .0000000000 0059576e0 /
data bip cs(18) / -.0000000000 0012194e0 /
data bip cs(19) / .0000000000 0001334e0 /
data bip cs(20) / .0000000000 0000172e0 /
data bip cs(21) / -.0000000000 0000145e0 /
data bip cs(22) / .0000000000 0000049e0 /
data bip cs(23) / -.0000000000 0000011e0 /
data bip cs(24) / .0000000000 0000001e0 /
c
c series for bip2 on the interval 0. to 1.25000d-01
c with weighted error 1.05e-18
c log weighted error 17.98
c significant figures required 16.74
c decimal places required 18.71
c
data bip2cs( 1) / -.1135967375 85988679e0 /
data bip2cs( 2) / .0041381473 947881595e0 /
data bip2cs( 3) / .0001353470 622119332e0 /
data bip2cs( 4) / .0000104273 166530153e0 /
data bip2cs( 5) / .0000013474 954767849e0 /
data bip2cs( 6) / .0000001696 537405438e0 /
data bip2cs( 7) / -.0000000100 965008656e0 /
data bip2cs( 8) / -.0000000167 291194937e0 /
data bip2cs( 9) / -.0000000045 815364485e0 /
data bip2cs(10) / .0000000003 736681366e0 /
data bip2cs(11) / .0000000005 766930320e0 /
data bip2cs(12) / .0000000000 621812650e0 /
data bip2cs(13) / -.0000000000 632941202e0 /
data bip2cs(14) / -.0000000000 149150479e0 /
data bip2cs(15) / .0000000000 078896213e0 /
data bip2cs(16) / .0000000000 024960513e0 /
data bip2cs(17) / -.0000000000 012130075e0 /
data bip2cs(18) / -.0000000000 003740493e0 /
data bip2cs(19) / .0000000000 002237727e0 /
data bip2cs(20) / .0000000000 000474902e0 /
data bip2cs(21) / -.0000000000 000452616e0 /
data bip2cs(22) / -.0000000000 000030172e0 /
data bip2cs(23) / .0000000000 000091058e0 /
data bip2cs(24) / -.0000000000 000009814e0 /
data bip2cs(25) / -.0000000000 000016429e0 /
data bip2cs(26) / .0000000000 000005533e0 /
data bip2cs(27) / .0000000000 000002175e0 /
data bip2cs(28) / -.0000000000 000001737e0 /
data bip2cs(29) / -.0000000000 000000010e0 /
c
data atr / 8.750690570 8484345 e0 /
c atr = 16.0/(sqrt(8.)-1.) and btr = -(sqrt(8.)+1.)/(sqrt(8.)-1.)
data btr / -2.093836321 356054 e0 /
c
data nbif, nbig, nbif2, nbig2, nbip, nbip2 / 6*0 /
data x3sml, x32sml, xbig / 3*0.0 /
c
if (nbif.ne.0) go to 10
eta = 0.1*r1mach(3)
nbif = inits (bifcs, 9, eta)
nbig = inits (bigcs, 8, eta)
nbif2 = inits (bif2cs, 10, eta)
nbig2 = inits (big2cs, 10, eta)
nbip = inits (bipcs , 24, eta)
nbip2 = inits (bip2cs, 29, eta)
c
x3sml = eta**0.3333
x32sml = 1.3104*x3sml**2
xbig = r1mach(2)**0.6666
c
10 if (x.ge.(-1.0)) go to 20
call r9aimp (x, xm, theta)
bie = xm * sin(theta)
return
c
20 if (x.gt.1.0) go to 30
z = 0.0
if (abs(x).gt.x3sml) z = x**3
bie = 0.625 + csevl (z, bifcs, nbif) + x*(0.4375 +
1 csevl (z, bigcs, nbig))
if (x.gt.x32sml) bie = bie * exp(-2.0*x*sqrt(x)/3.0)
return
c
30 if (x.gt.2.0) go to 40
z = (2.0*x**3 - 9.0) / 7.0
bie = exp(-2.0*x*sqrt(x)/3.0) * (1.125 + csevl (z, bif2cs, nbif2)
1 + x*(0.625 + csevl (z, big2cs, nbig2)) )
return
c
40 if (x.gt.4.0) go to 50
sqrtx = sqrt(x)
z = atr/(x*sqrtx) + btr
bie = (0.625 + csevl (z, bipcs, nbip)) / sqrt(sqrtx)
return
c
50 sqrtx = sqrt(x)
z = -1.0
if (x.lt.xbig) z = 16.0/(x*sqrtx) - 1.0
bie = (0.625 + csevl (z, bip2cs, nbip2))/sqrt(sqrtx)
return
c
end