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Use the C library version of log10() instead of the inaccurate formula

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log10(x) = log10e * log(x).  This fixes some small (one or two ULP)
inaccuracies.

Found by:	ucbtest
This commit is contained in:
Bruce Evans 1997-02-24 17:44:08 +00:00
parent 9e2d0733c5
commit 5d8d8dd3b6
1 changed files with 2 additions and 4 deletions
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6
lib/libF77/d_lg10.c
View file

@ -1,9 +1,7 @@
#include "f2c.h"
#define log10e 0.43429448190325182765
#ifdef KR_headers
double log();
double log10();
double d_lg10(x) doublereal *x;
#else
#undef abs
@ -11,5 +9,5 @@ double d_lg10(x) doublereal *x;
double d_lg10(doublereal *x)
#endif
{
return( log10e * log(*x) );
return( log10(*x) );
}