positivity.c

该文件为c++的数学函数库!是一个非常有用的编程工具.它含有各种数学函数,为科学计算、工程应用等程序编写提供方便！

/* Compare the integral of f(x) with the integral of |f(x)|
   to determine if f(x) covers both positive and negative values */

static inline int
test_positivity (double result, double resabs);

static inline int
test_positivity (double result, double resabs)
{
  int status = (fabs (result) >= (1 - 50 * GSL_DBL_EPSILON) * resabs);

  return status;
}