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: http://xmm.vilspa.esa.es/sas/8.0.0/doc/ssclib/node41.html
Дата изменения: Wed Jul 2 03:52:39 2008 Дата индексирования: Fri Sep 5 18:38:21 2008 Кодировка: Поисковые слова: annular solar eclipse |
The precision at long wavelengths L is limited by the calculation of exp(x)-1, where x = hk/TL. At low values of x, exp(x) is close to 1 and thus the difference between exp(x) and 1 is a number of low precision. Thus for x values less than 0.1, a series expansion of (exp(x)-1)/x is used instead. The minimum precision occurs at x = 0.1 and is approximately equal to precision(1d0)-1.
subroutine getBBfluxPerMetre(angstromValues, kelvin, powerValues) real(double), intent(in) :: angstromValues(:), kelvin real(double), intent(out) :: powerValues(size(angstromValues)) end subroutine getBBfluxPerMetre function bbFluxPerMetre(angstroms, kelvin) result(power) real(double), intent(in) :: angstroms, kelvin real(double) :: power end function bbFluxPerMetre