Doxygen Source Code Documentation
cdf_61.c File Reference
#include "cdflib.h"Go to the source code of this file.
Functions | |
| double | gamln1 (double *a) |
Function Documentation
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Definition at line 2 of file cdf_61.c. References a, gamln1(), and s2. Referenced by bpser(), brcmp1(), brcomp(), dlngam(), gaminv(), gamln(), gamln1(), and gsumln().
00008 {
00009 static double p0 = .577215664901533e+00;
00010 static double p1 = .844203922187225e+00;
00011 static double p2 = -.168860593646662e+00;
00012 static double p3 = -.780427615533591e+00;
00013 static double p4 = -.402055799310489e+00;
00014 static double p5 = -.673562214325671e-01;
00015 static double p6 = -.271935708322958e-02;
00016 static double q1 = .288743195473681e+01;
00017 static double q2 = .312755088914843e+01;
00018 static double q3 = .156875193295039e+01;
00019 static double q4 = .361951990101499e+00;
00020 static double q5 = .325038868253937e-01;
00021 static double q6 = .667465618796164e-03;
00022 static double r0 = .422784335098467e+00;
00023 static double r1 = .848044614534529e+00;
00024 static double r2 = .565221050691933e+00;
00025 static double r3 = .156513060486551e+00;
00026 static double r4 = .170502484022650e-01;
00027 static double r5 = .497958207639485e-03;
00028 static double s1 = .124313399877507e+01;
00029 static double s2 = .548042109832463e+00;
00030 static double s3 = .101552187439830e+00;
00031 static double s4 = .713309612391000e-02;
00032 static double s5 = .116165475989616e-03;
00033 static double gamln1,w,x;
00034 /*
00035 ..
00036 .. Executable Statements ..
00037 */
00038 if(*a >= 0.6e0) goto S10;
00039 w = ((((((p6**a+p5)**a+p4)**a+p3)**a+p2)**a+p1)**a+p0)/((((((q6**a+q5)**a+
00040 q4)**a+q3)**a+q2)**a+q1)**a+1.0e0);
00041 gamln1 = -(*a*w);
00042 return gamln1;
00043 S10:
00044 x = *a-0.5e0-0.5e0;
00045 w = (((((r5*x+r4)*x+r3)*x+r2)*x+r1)*x+r0)/(((((s5*x+s4)*x+s3)*x+s2)*x+s1)*x
00046 +1.0e0);
00047 gamln1 = x*w;
00048 return gamln1;
00049 } /* END */
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