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206 lines
9 KiB
Fortran
206 lines
9 KiB
Fortran
*DECK BIE
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FUNCTION BIE (X)
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C***BEGIN PROLOGUE BIE
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C***PURPOSE Calculate the Bairy function for a negative argument and an
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C exponentially scaled Bairy function for a non-negative
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C argument.
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C***LIBRARY SLATEC (FNLIB)
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C***CATEGORY C10D
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C***TYPE SINGLE PRECISION (BIE-S, DBIE-D)
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C***KEYWORDS BAIRY FUNCTION, EXPONENTIALLY SCALED, FNLIB,
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C SPECIAL FUNCTIONS
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C***AUTHOR Fullerton, W., (LANL)
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C***DESCRIPTION
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C
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C Evaluate BI(X) for X .LE. 0 and BI(X)*EXP(ZETA) where
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C ZETA = 2/3 * X**(3/2) for X .GE. 0.0
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C
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C Series for BIF on the interval -1.00000D+00 to 1.00000D+00
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C with weighted error 1.88E-19
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C log weighted error 18.72
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C significant figures required 17.74
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C decimal places required 19.20
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C
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C Series for BIG on the interval -1.00000D+00 to 1.00000D+00
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C with weighted error 2.61E-17
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C log weighted error 16.58
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C significant figures required 15.17
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C decimal places required 17.03
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C
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C Series for BIF2 on the interval 1.00000D+00 to 8.00000D+00
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C with weighted error 1.11E-17
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C log weighted error 16.95
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C approx significant figures required 16.5
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C decimal places required 17.45
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C
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C Series for BIG2 on the interval 1.00000D+00 to 8.00000D+00
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C with weighted error 1.19E-18
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C log weighted error 17.92
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C approx significant figures required 17.2
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C decimal places required 18.42
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C
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C Series for BIP on the interval 1.25000D-01 to 3.53553D-01
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C with weighted error 1.91E-17
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C log weighted error 16.72
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C significant figures required 15.35
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C decimal places required 17.41
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C
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C Series for BIP2 on the interval 0. to 1.25000D-01
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C with weighted error 1.05E-18
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C log weighted error 17.98
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C significant figures required 16.74
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C decimal places required 18.71
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C
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C***REFERENCES (NONE)
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C***ROUTINES CALLED CSEVL, INITS, R1MACH, R9AIMP
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C***REVISION HISTORY (YYMMDD)
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C 770701 DATE WRITTEN
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C 890206 REVISION DATE from Version 3.2
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C***END PROLOGUE BIE
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LOGICAL FIRST
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DIMENSION BIFCS(9), BIGCS(8), BIF2CS(10), BIG2CS(10), BIPCS(24),
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1 BIP2CS(29)
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SAVE BIFCS, BIGCS, BIF2CS, BIG2CS, BIPCS, BIP2CS, ATR, BTR,
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1 NBIF, NBIG, NBIF2, NBIG2, NBIP, NBIP2, X3SML, X32SML, XBIG, FIRST
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DATA BIFCS( 1) / -.0167302164 7198664948E0 /
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DATA BIFCS( 2) / .1025233583 424944561E0 /
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DATA BIFCS( 3) / .0017083092 5073815165E0 /
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DATA BIFCS( 4) / .0000118625 4546774468E0 /
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DATA BIFCS( 5) / .0000000449 3290701779E0 /
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DATA BIFCS( 6) / .0000000001 0698207143E0 /
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DATA BIFCS( 7) / .0000000000 0017480643E0 /
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DATA BIFCS( 8) / .0000000000 0000020810E0 /
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DATA BIFCS( 9) / .0000000000 0000000018E0 /
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DATA BIGCS( 1) / .0224662232 4857452E0 /
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DATA BIGCS( 2) / .0373647754 5301955E0 /
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DATA BIGCS( 3) / .0004447621 8957212E0 /
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DATA BIGCS( 4) / .0000024708 0756363E0 /
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DATA BIGCS( 5) / .0000000079 1913533E0 /
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DATA BIGCS( 6) / .0000000000 1649807E0 /
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DATA BIGCS( 7) / .0000000000 0002411E0 /
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DATA BIGCS( 8) / .0000000000 0000002E0 /
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DATA BIF2CS( 1) / 0.0998457269 3816041E0 /
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DATA BIF2CS( 2) / .4786249778 63005538E0 /
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DATA BIF2CS( 3) / .0251552119 604330118E0 /
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DATA BIF2CS( 4) / .0005820693 885232645E0 /
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DATA BIF2CS( 5) / .0000074997 659644377E0 /
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DATA BIF2CS( 6) / .0000000613 460287034E0 /
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DATA BIF2CS( 7) / .0000000003 462753885E0 /
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DATA BIF2CS( 8) / .0000000000 014288910E0 /
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DATA BIF2CS( 9) / .0000000000 000044962E0 /
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DATA BIF2CS(10) / .0000000000 000000111E0 /
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DATA BIG2CS( 1) / .0333056621 45514340E0 /
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DATA BIG2CS( 2) / .1613092151 23197068E0 /
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DATA BIG2CS( 3) / .0063190073 096134286E0 /
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DATA BIG2CS( 4) / .0001187904 568162517E0 /
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DATA BIG2CS( 5) / .0000013045 345886200E0 /
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DATA BIG2CS( 6) / .0000000093 741259955E0 /
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DATA BIG2CS( 7) / .0000000000 474580188E0 /
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DATA BIG2CS( 8) / .0000000000 001783107E0 /
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DATA BIG2CS( 9) / .0000000000 000005167E0 /
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DATA BIG2CS(10) / .0000000000 000000011E0 /
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DATA BIPCS( 1) / -.0832204747 7943447E0 /
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DATA BIPCS( 2) / .0114611892 7371174E0 /
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DATA BIPCS( 3) / .0004289644 0718911E0 /
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DATA BIPCS( 4) / -.0001490663 9379950E0 /
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DATA BIPCS( 5) / -.0000130765 9726787E0 /
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DATA BIPCS( 6) / .0000063275 9839610E0 /
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DATA BIPCS( 7) / -.0000004222 6696982E0 /
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DATA BIPCS( 8) / -.0000001914 7186298E0 /
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DATA BIPCS( 9) / .0000000645 3106284E0 /
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DATA BIPCS(10) / -.0000000078 4485467E0 /
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DATA BIPCS(11) / -.0000000009 6077216E0 /
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DATA BIPCS(12) / .0000000007 0004713E0 /
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DATA BIPCS(13) / -.0000000001 7731789E0 /
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DATA BIPCS(14) / .0000000000 2272089E0 /
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DATA BIPCS(15) / .0000000000 0165404E0 /
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DATA BIPCS(16) / -.0000000000 0185171E0 /
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DATA BIPCS(17) / .0000000000 0059576E0 /
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DATA BIPCS(18) / -.0000000000 0012194E0 /
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DATA BIPCS(19) / .0000000000 0001334E0 /
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DATA BIPCS(20) / .0000000000 0000172E0 /
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DATA BIPCS(21) / -.0000000000 0000145E0 /
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DATA BIPCS(22) / .0000000000 0000049E0 /
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DATA BIPCS(23) / -.0000000000 0000011E0 /
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DATA BIPCS(24) / .0000000000 0000001E0 /
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DATA BIP2CS( 1) / -.1135967375 85988679E0 /
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DATA BIP2CS( 2) / .0041381473 947881595E0 /
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DATA BIP2CS( 3) / .0001353470 622119332E0 /
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DATA BIP2CS( 4) / .0000104273 166530153E0 /
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DATA BIP2CS( 5) / .0000013474 954767849E0 /
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DATA BIP2CS( 6) / .0000001696 537405438E0 /
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DATA BIP2CS( 7) / -.0000000100 965008656E0 /
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DATA BIP2CS( 8) / -.0000000167 291194937E0 /
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DATA BIP2CS( 9) / -.0000000045 815364485E0 /
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DATA BIP2CS(10) / .0000000003 736681366E0 /
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DATA BIP2CS(11) / .0000000005 766930320E0 /
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DATA BIP2CS(12) / .0000000000 621812650E0 /
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DATA BIP2CS(13) / -.0000000000 632941202E0 /
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DATA BIP2CS(14) / -.0000000000 149150479E0 /
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DATA BIP2CS(15) / .0000000000 078896213E0 /
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DATA BIP2CS(16) / .0000000000 024960513E0 /
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DATA BIP2CS(17) / -.0000000000 012130075E0 /
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DATA BIP2CS(18) / -.0000000000 003740493E0 /
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DATA BIP2CS(19) / .0000000000 002237727E0 /
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DATA BIP2CS(20) / .0000000000 000474902E0 /
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DATA BIP2CS(21) / -.0000000000 000452616E0 /
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DATA BIP2CS(22) / -.0000000000 000030172E0 /
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DATA BIP2CS(23) / .0000000000 000091058E0 /
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DATA BIP2CS(24) / -.0000000000 000009814E0 /
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DATA BIP2CS(25) / -.0000000000 000016429E0 /
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DATA BIP2CS(26) / .0000000000 000005533E0 /
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DATA BIP2CS(27) / .0000000000 000002175E0 /
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DATA BIP2CS(28) / -.0000000000 000001737E0 /
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DATA BIP2CS(29) / -.0000000000 000000010E0 /
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DATA ATR / 8.750690570 8484345 E0 /
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DATA BTR / -2.093836321 356054 E0 /
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DATA FIRST /.TRUE./
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C***FIRST EXECUTABLE STATEMENT BIE
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IF (FIRST) THEN
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ETA = 0.1*R1MACH(3)
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NBIF = INITS (BIFCS, 9, ETA)
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NBIG = INITS (BIGCS, 8, ETA)
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NBIF2 = INITS (BIF2CS, 10, ETA)
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NBIG2 = INITS (BIG2CS, 10, ETA)
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NBIP = INITS (BIPCS , 24, ETA)
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NBIP2 = INITS (BIP2CS, 29, ETA)
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C
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X3SML = ETA**0.3333
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X32SML = 1.3104*X3SML**2
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XBIG = R1MACH(2)**0.6666
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ENDIF
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FIRST = .FALSE.
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C
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IF (X.GE.(-1.0)) GO TO 20
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CALL R9AIMP (X, XM, THETA)
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BIE = XM * SIN(THETA)
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RETURN
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C
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20 IF (X.GT.1.0) GO TO 30
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Z = 0.0
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IF (ABS(X).GT.X3SML) Z = X**3
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BIE = 0.625 + CSEVL (Z, BIFCS, NBIF) + X*(0.4375 +
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1 CSEVL (Z, BIGCS, NBIG))
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IF (X.GT.X32SML) BIE = BIE * EXP(-2.0*X*SQRT(X)/3.0)
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RETURN
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C
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30 IF (X.GT.2.0) GO TO 40
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Z = (2.0*X**3 - 9.0) / 7.0
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BIE = EXP(-2.0*X*SQRT(X)/3.0) * (1.125 + CSEVL (Z, BIF2CS, NBIF2)
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1 + X*(0.625 + CSEVL (Z, BIG2CS, NBIG2)) )
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RETURN
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C
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40 IF (X.GT.4.0) GO TO 50
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SQRTX = SQRT(X)
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Z = ATR/(X*SQRTX) + BTR
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BIE = (0.625 + CSEVL (Z, BIPCS, NBIP)) / SQRT(SQRTX)
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RETURN
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C
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50 SQRTX = SQRT(X)
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Z = -1.0
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IF (X.LT.XBIG) Z = 16.0/(X*SQRTX) - 1.0
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BIE = (0.625 + CSEVL (Z, BIP2CS, NBIP2))/SQRT(SQRTX)
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RETURN
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C
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END
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