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weather: use expf if --enable_math is given, otherwise use fast 3rd order approximation

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This commit is contained in:
Cesare Tirabassi 2009-07-18 07:57:04 +02:00
parent 0bc0f46101
commit cba36f279b
1 changed files with 9 additions and 2 deletions
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11
src/weather.c
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@ -27,6 +27,9 @@
#include "temphelper.h"
#include <time.h>
#include <ctype.h>
#ifdef MATH
#include <math.h>
#endif /* MATH */
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
@ -109,8 +112,12 @@ int rel_humidity(int dew_point, int air) {
const float a = 17.27f;
const float b = 237.7f;
float g = a*dew_point/(b+dew_point);
return (int)(100.f*expf(g-a*air/(b+air)));
float diff = a*(dew_point/(b+dew_point)-air/(b+air));
#ifdef MATH
return (int)(100.f*expf(diff));
#else
return (int)(16.666667163372f*(6.f+diff*(6.f+diff*(3.f+diff))));
#endif /* MATH */
}
/*