mo_linfit::linfit Interface Reference

Fits a straight line to input data by minimizing chi^2. More...

Public Member Functions
real(sp) function, dimension(:), allocatable	linfit_sp (x, y, a, b, siga, sigb, chi2, model2)
real(dp) function, dimension(:), allocatable	linfit_dp (x, y, a, b, siga, sigb, chi2, model2)

Detailed Description

Fits a straight line to input data by minimizing chi^2.

Given a set of data points x(1:ndata), y(1:ndata), fit them to a straight line \( y = a+bx \) by minimizing chi2.
Model I minimizes y vs. x while Model II takes the geometric mean of y vs. x and x vs. y. Returned is the fitted line at x. Optional returns are a, b and their respective probable uncertainties siga and sigb, and the chi-square chi2.

Parameters

[in]	real(sp/dp) :: x(:)	1D-array with input x
[in]	real(sp/dp) :: y(:)	1D-array with input y
[in]	logical, optional :: model2	If present, use geometric mean regression instead of ordinary least square
[out]	real(sp/dp), dimension(M) :: a	intercept
[out]	real(sp/dp), dimension(M) :: b	slope
[out]	real(sp/dp), dimension(M) :: siga	error on intercept
[out]	real(sp/dp), dimension(M) :: sigb	error on slope
[out]	real(sp/dp) :: chisq	Minimum chi^2

Returns

real(sp/dp), dimension(:), allocatable :: out — fitted values at x(:).

Definition at line 84 of file mo_linfit.f90.

Member Function/Subroutine Documentation

linfit_dp()

real(dp) function, dimension(:), allocatable mo_linfit::linfit::linfit_dp	(	real(dp), dimension(:), intent(in)	x,
		real(dp), dimension(:), intent(in)	y,
		real(dp), intent(out), optional	a,
		real(dp), intent(out), optional	b,
		real(dp), intent(out), optional	siga,
		real(dp), intent(out), optional	sigb,
		real(dp), intent(out), optional	chi2,
		logical, intent(in), optional	model2
	)

Definition at line 98 of file mo_linfit.f90.

linfit_sp()

real(sp) function, dimension(:), allocatable mo_linfit::linfit::linfit_sp	(	real(sp), dimension(:), intent(in)	x,
		real(sp), dimension(:), intent(in)	y,
		real(sp), intent(out), optional	a,
		real(sp), intent(out), optional	b,
		real(sp), intent(out), optional	siga,
		real(sp), intent(out), optional	sigb,
		real(sp), intent(out), optional	chi2,
		logical, intent(in), optional	model2
	)

Definition at line 189 of file mo_linfit.f90.

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The documentation for this interface was generated from the following file:

• src/mo_linfit.f90