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-rw-r--r--libm/double/k1.c335
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diff --git a/libm/double/k1.c b/libm/double/k1.c
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-/* k1.c
- *
- * Modified Bessel function, third kind, order one
- *
- *
- *
- * SYNOPSIS:
- *
- * double x, y, k1();
- *
- * y = k1( x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Computes the modified Bessel function of the third kind
- * of order one of the argument.
- *
- * The range is partitioned into the two intervals [0,2] and
- * (2, infinity). Chebyshev polynomial expansions are employed
- * in each interval.
- *
- *
- *
- * ACCURACY:
- *
- * Relative error:
- * arithmetic domain # trials peak rms
- * DEC 0, 30 3300 8.9e-17 2.2e-17
- * IEEE 0, 30 30000 1.2e-15 1.6e-16
- *
- * ERROR MESSAGES:
- *
- * message condition value returned
- * k1 domain x <= 0 MAXNUM
- *
- */
- /* k1e.c
- *
- * Modified Bessel function, third kind, order one,
- * exponentially scaled
- *
- *
- *
- * SYNOPSIS:
- *
- * double x, y, k1e();
- *
- * y = k1e( x );
- *
- *
- *
- * DESCRIPTION:
- *
- * Returns exponentially scaled modified Bessel function
- * of the third kind of order one of the argument:
- *
- * k1e(x) = exp(x) * k1(x).
- *
- *
- *
- * ACCURACY:
- *
- * Relative error:
- * arithmetic domain # trials peak rms
- * IEEE 0, 30 30000 7.8e-16 1.2e-16
- * See k1().
- *
- */
-
-/*
-Cephes Math Library Release 2.8: June, 2000
-Copyright 1984, 1987, 2000 by Stephen L. Moshier
-*/
-
-#include <math.h>
-
-/* Chebyshev coefficients for x(K1(x) - log(x/2) I1(x))
- * in the interval [0,2].
- *
- * lim(x->0){ x(K1(x) - log(x/2) I1(x)) } = 1.
- */
-
-#ifdef UNK
-static double A[] =
-{
--7.02386347938628759343E-18,
--2.42744985051936593393E-15,
--6.66690169419932900609E-13,
--1.41148839263352776110E-10,
--2.21338763073472585583E-8,
--2.43340614156596823496E-6,
--1.73028895751305206302E-4,
--6.97572385963986435018E-3,
--1.22611180822657148235E-1,
--3.53155960776544875667E-1,
- 1.52530022733894777053E0
-};
-#endif
-
-#ifdef DEC
-static unsigned short A[] = {
-0122001,0110501,0164746,0151255,
-0124056,0165213,0150034,0147377,
-0126073,0124026,0167207,0001044,
-0130033,0030735,0141061,0033116,
-0131676,0020350,0121341,0107175,
-0133443,0046631,0062031,0070716,
-0135065,0067427,0026435,0164022,
-0136344,0112234,0165752,0006222,
-0137373,0015622,0017016,0155636,
-0137664,0150333,0125730,0067240,
-0040303,0036411,0130200,0043120
-};
-#endif
-
-#ifdef IBMPC
-static unsigned short A[] = {
-0xda56,0x3d3c,0x3228,0xbc60,
-0x99e0,0x7a03,0xdd51,0xbce5,
-0xe045,0xddd0,0x7502,0xbd67,
-0x26ca,0xb846,0x663b,0xbde3,
-0x31d0,0x145c,0xc41d,0xbe57,
-0x2e3a,0x2c83,0x69b3,0xbec4,
-0xbd02,0xe5a3,0xade2,0xbf26,
-0x4192,0x9d7d,0x9293,0xbf7c,
-0xdb74,0x43c1,0x6372,0xbfbf,
-0x0dd4,0x757b,0x9a1b,0xbfd6,
-0x08ca,0x3610,0x67a1,0x3ff8
-};
-#endif
-
-#ifdef MIEEE
-static unsigned short A[] = {
-0xbc60,0x3228,0x3d3c,0xda56,
-0xbce5,0xdd51,0x7a03,0x99e0,
-0xbd67,0x7502,0xddd0,0xe045,
-0xbde3,0x663b,0xb846,0x26ca,
-0xbe57,0xc41d,0x145c,0x31d0,
-0xbec4,0x69b3,0x2c83,0x2e3a,
-0xbf26,0xade2,0xe5a3,0xbd02,
-0xbf7c,0x9293,0x9d7d,0x4192,
-0xbfbf,0x6372,0x43c1,0xdb74,
-0xbfd6,0x9a1b,0x757b,0x0dd4,
-0x3ff8,0x67a1,0x3610,0x08ca
-};
-#endif
-
-
-
-/* Chebyshev coefficients for exp(x) sqrt(x) K1(x)
- * in the interval [2,infinity].
- *
- * lim(x->inf){ exp(x) sqrt(x) K1(x) } = sqrt(pi/2).
- */
-
-#ifdef UNK
-static double B[] =
-{
--5.75674448366501715755E-18,
- 1.79405087314755922667E-17,
--5.68946255844285935196E-17,
- 1.83809354436663880070E-16,
--6.05704724837331885336E-16,
- 2.03870316562433424052E-15,
--7.01983709041831346144E-15,
- 2.47715442448130437068E-14,
--8.97670518232499435011E-14,
- 3.34841966607842919884E-13,
--1.28917396095102890680E-12,
- 5.13963967348173025100E-12,
--2.12996783842756842877E-11,
- 9.21831518760500529508E-11,
--4.19035475934189648750E-10,
- 2.01504975519703286596E-9,
--1.03457624656780970260E-8,
- 5.74108412545004946722E-8,
--3.50196060308781257119E-7,
- 2.40648494783721712015E-6,
--1.93619797416608296024E-5,
- 1.95215518471351631108E-4,
--2.85781685962277938680E-3,
- 1.03923736576817238437E-1,
- 2.72062619048444266945E0
-};
-#endif
-
-#ifdef DEC
-static unsigned short B[] = {
-0121724,0061352,0013041,0150076,
-0022245,0074324,0016172,0173232,
-0122603,0030250,0135670,0165221,
-0023123,0165362,0023561,0060124,
-0123456,0112436,0141654,0073623,
-0024022,0163557,0077564,0006753,
-0124374,0165221,0131014,0026524,
-0024737,0017512,0144250,0175451,
-0125312,0021456,0123136,0076633,
-0025674,0077720,0020125,0102607,
-0126265,0067543,0007744,0043701,
-0026664,0152702,0033002,0074202,
-0127273,0055234,0120016,0071733,
-0027712,0133200,0042441,0075515,
-0130346,0057000,0015456,0074470,
-0031012,0074441,0051636,0111155,
-0131461,0136444,0177417,0002101,
-0032166,0111743,0032176,0021410,
-0132674,0001224,0076555,0027060,
-0033441,0077430,0135226,0106663,
-0134242,0065610,0167155,0113447,
-0035114,0131304,0043664,0102163,
-0136073,0045065,0171465,0122123,
-0037324,0152767,0147401,0017732,
-0040456,0017275,0050061,0062120,
-};
-#endif
-
-#ifdef IBMPC
-static unsigned short B[] = {
-0x3a08,0x42c4,0x8c5d,0xbc5a,
-0x5ed3,0x838f,0xaf1a,0x3c74,
-0x1d52,0x1777,0x6615,0xbc90,
-0x2c0b,0x44ee,0x7d5e,0x3caa,
-0x8ef2,0xd875,0xd2a3,0xbcc5,
-0x81bd,0xefee,0x5ced,0x3ce2,
-0x85ab,0x3641,0x9d52,0xbcff,
-0x1f65,0x5915,0xe3e9,0x3d1b,
-0xcfb3,0xd4cb,0x4465,0xbd39,
-0xb0b1,0x040a,0x8ffa,0x3d57,
-0x88f8,0x61fc,0xadec,0xbd76,
-0x4f10,0x46c0,0x9ab8,0x3d96,
-0xce7b,0x9401,0x6b53,0xbdb7,
-0x2f6a,0x08a4,0x56d0,0x3dd9,
-0xcf27,0x0365,0xcbc0,0xbdfc,
-0xd24e,0x2a73,0x4f24,0x3e21,
-0xe088,0x9fe1,0x37a4,0xbe46,
-0xc461,0x668f,0xd27c,0x3e6e,
-0xa5c6,0x8fad,0x8052,0xbe97,
-0xd1b6,0x1752,0x2fe3,0x3ec4,
-0xb2e5,0x1dcd,0x4d71,0xbef4,
-0x908e,0x88f6,0x9658,0x3f29,
-0xb48a,0xbe66,0x6946,0xbf67,
-0x23fb,0xf9e0,0x9abe,0x3fba,
-0x2c8a,0xaa06,0xc3d7,0x4005
-};
-#endif
-
-#ifdef MIEEE
-static unsigned short B[] = {
-0xbc5a,0x8c5d,0x42c4,0x3a08,
-0x3c74,0xaf1a,0x838f,0x5ed3,
-0xbc90,0x6615,0x1777,0x1d52,
-0x3caa,0x7d5e,0x44ee,0x2c0b,
-0xbcc5,0xd2a3,0xd875,0x8ef2,
-0x3ce2,0x5ced,0xefee,0x81bd,
-0xbcff,0x9d52,0x3641,0x85ab,
-0x3d1b,0xe3e9,0x5915,0x1f65,
-0xbd39,0x4465,0xd4cb,0xcfb3,
-0x3d57,0x8ffa,0x040a,0xb0b1,
-0xbd76,0xadec,0x61fc,0x88f8,
-0x3d96,0x9ab8,0x46c0,0x4f10,
-0xbdb7,0x6b53,0x9401,0xce7b,
-0x3dd9,0x56d0,0x08a4,0x2f6a,
-0xbdfc,0xcbc0,0x0365,0xcf27,
-0x3e21,0x4f24,0x2a73,0xd24e,
-0xbe46,0x37a4,0x9fe1,0xe088,
-0x3e6e,0xd27c,0x668f,0xc461,
-0xbe97,0x8052,0x8fad,0xa5c6,
-0x3ec4,0x2fe3,0x1752,0xd1b6,
-0xbef4,0x4d71,0x1dcd,0xb2e5,
-0x3f29,0x9658,0x88f6,0x908e,
-0xbf67,0x6946,0xbe66,0xb48a,
-0x3fba,0x9abe,0xf9e0,0x23fb,
-0x4005,0xc3d7,0xaa06,0x2c8a
-};
-#endif
-
-#ifdef ANSIPROT
-extern double chbevl ( double, void *, int );
-extern double exp ( double );
-extern double i1 ( double );
-extern double log ( double );
-extern double sqrt ( double );
-#else
-double chbevl(), exp(), i1(), log(), sqrt();
-#endif
-extern double PI;
-extern double MINLOG, MAXNUM;
-
-double k1(x)
-double x;
-{
-double y, z;
-
-z = 0.5 * x;
-if( z <= 0.0 )
- {
- mtherr( "k1", DOMAIN );
- return( MAXNUM );
- }
-
-if( x <= 2.0 )
- {
- y = x * x - 2.0;
- y = log(z) * i1(x) + chbevl( y, A, 11 ) / x;
- return( y );
- }
-
-return( exp(-x) * chbevl( 8.0/x - 2.0, B, 25 ) / sqrt(x) );
-}
-
-
-
-
-double k1e( x )
-double x;
-{
-double y;
-
-if( x <= 0.0 )
- {
- mtherr( "k1e", DOMAIN );
- return( MAXNUM );
- }
-
-if( x <= 2.0 )
- {
- y = x * x - 2.0;
- y = log( 0.5 * x ) * i1(x) + chbevl( y, A, 11 ) / x;
- return( y * exp(x) );
- }
-
-return( chbevl( 8.0/x - 2.0, B, 25 ) / sqrt(x) );
-}