f_dst_chi2_ppf Function

public impure function f_dst_chi2_ppf(p, df, loc, scale) result(x)

Impure wrapper function for f_dst_chi2_ppf_core. Handles optional arguments and invalid values for arguments.

Arguments

Type IntentOptional Attributes Name
real(kind=wp), intent(in) :: p

probability between 0.0 and 1.0
real(kind=wp), intent(in) :: df

degrees of freedom
real(kind=wp), intent(in), optional :: loc

location parameter
real(kind=wp), intent(in), optional :: scale

scale parameter

Return Value real(kind=wp)

sample position


Calls

proc~~f_dst_chi2_ppf~~CallsGraph proc~f_dst_chi2_ppf f_dst_chi2_ppf proc~f_dst_chi2_ppf_core f_dst_chi2_ppf_core proc~f_dst_chi2_ppf->proc~f_dst_chi2_ppf_core proc~s_err_print s_err_print proc~f_dst_chi2_ppf->proc~s_err_print proc~s_err_warn s_err_warn proc~f_dst_chi2_ppf->proc~s_err_warn proc~f_dst_chi2_cdf_core f_dst_chi2_cdf_core proc~f_dst_chi2_ppf_core->proc~f_dst_chi2_cdf_core proc~f_utl_r2c f_utl_r2c proc~s_err_print->proc~f_utl_r2c proc~f_dst_gammai_core f_dst_gammai_core proc~f_dst_chi2_cdf_core->proc~f_dst_gammai_core

Called by

proc~~f_dst_chi2_ppf~~CalledByGraph proc~f_dst_chi2_ppf f_dst_chi2_ppf interface~fsml_chi2_ppf fsml_chi2_ppf interface~fsml_chi2_ppf->proc~f_dst_chi2_ppf

Source Code

impure function f_dst_chi2_ppf(p, df, loc, scale) result(x)

! ==== Description
!! Impure wrapper function for `f_dst_chi2_ppf_core`.
!! Handles optional arguments and invalid values for arguments.

! ==== Declarations
  real(wp), intent(in)           :: p                !! probability between 0.0 and 1.0
  real(wp), intent(in)           :: df               !! degrees of freedom
  real(wp), intent(in), optional :: loc              !! location parameter
  real(wp), intent(in), optional :: scale            !! scale parameter
  real(wp)                       :: loc_w            !! final value for loc
  real(wp)                       :: scale_w          !! final value for scale
  real(wp)                       :: x                !! sample position

! ==== Instructions

! ---- handle input

  ! assume loc = 0, overwrite if specified
  loc_w = 0.0_wp
  if (present(loc)) loc_w = loc

  ! assume scale = 1, overwrite if specified
  scale_w = 1.0_wp
  if (present(scale)) scale_w = scale

  ! check if scale value is valid
  if (scale_w .le. 0.0_wp) then
     ! write error message and assign sentinel value if invalid
     call s_err_print(fsml_error(1))
     x = c_sentinel_r
     return
  endif

  ! check if degrees of freedom value is valid
  if (df .le. 0.0_wp) then
     ! write error message and assign sentinel value if invalid
     call s_err_print(fsml_error(1))
     x = c_sentinel_r
     return
  endif

  ! check if p value is valid
  if (p .gt. 1.0_wp .or. p .lt. 0.0_wp) then
     ! write error message and assign sentinel value if invalid
     call s_err_print(fsml_error(1))
     x = c_sentinel_r
     return
  endif

! ---- compute PPF

  ! call pure function to calculate x
  x = f_dst_chi2_ppf_core(p, df, loc_w, scale_w)

  ! issue warning in case of suspicious result
  if (x .eq. c_sentinel_r) call s_err_warn(fsml_warning(1))

end function f_dst_chi2_ppf