| @cindex elementary operations |
| @cindex multiplication |
| |
| The following functions allow for the propagation of errors when |
| combining quantities by multiplication. The functions are declared in |
| the header file @file{gsl_sf_elementary.h}. |
| |
| @comment @deftypefun double gsl_sf_multiply (double @var{x}, double @var{y}) |
| @deftypefun int gsl_sf_multiply_e (double @var{x}, double @var{y}, gsl_sf_result * @var{result}) |
| This function multiplies @var{x} and @var{y} storing the product and its |
| associated error in @var{result}. |
| @comment Exceptional Return Values: GSL_EOVRFLW, GSL_EUNDRFLW |
| @end deftypefun |
| |
| |
| @deftypefun int gsl_sf_multiply_err_e (double @var{x}, double @var{dx}, double @var{y}, double @var{dy}, gsl_sf_result * @var{result}) |
| This function multiplies @var{x} and @var{y} with associated absolute |
| errors @var{dx} and @var{dy}. The product |
| @c{$xy \pm xy \sqrt{(dx/x)^2 +(dy/y)^2}$} |
| @math{xy +/- xy \sqrt((dx/x)^2 +(dy/y)^2)} |
| is stored in @var{result}. |
| @comment Exceptional Return Values: GSL_EOVRFLW, GSL_EUNDRFLW |
| @end deftypefun |
