mod_lookup_table Module Reference

A Fortran 90 module for creating 1D and 2D lookup tables. These tables can be used to efficiently interpolate one or more values. More...

Functions/Subroutines
pure integer function, public	find_index_linear (list, val)
	Linear search of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1. More...
pure integer function, public	find_index_bsearch (list, val)
	Binary search of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1. More...
pure integer function, public	find_index_adaptive (list, val)
	Adaptive search (combination of linear and binary search) of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1. More...
type(lt_t) function, public	lt_create (x_min, x_max, n_points, n_cols)
	This function returns a new lookup table. More...
type(lt_t) function, public	lt_create_from_data (x_min, x_max, spaced_data)
	This function returns a new lookup table from regularly spaced data. More...
pure real(dp) function, dimension(n_points), public	lt_get_xdata (x_min, dx, n_points)
	Returns the x-coordinates of the lookup table. More...
pure real(dp) function, dimension(size(new_x)), public	lt_get_spaced_data (in_x, in_y, new_x)
	Linearly interpolate the (x, y) input data to the new_x coordinates. More...
pure subroutine, public	lt_set_col (my_lt, col_ix, x, y)
	Fill the column with index col_ix using the linearly interpolated (x, y) data. More...
pure subroutine, public	lt_add_col (my_lt, x, y)
	Add a new column by linearly interpolating the (x, y) data. More...
elemental type(lt_loc_t) function, public	lt_get_loc (my_lt, x)
	Get a location in the lookup table. More...
pure real(dp) function, dimension(my_lt%n_cols), public	lt_get_mcol (my_lt, x)
	Get the values of all columns at x. More...
elemental real(dp) function, public	lt_get_col (my_lt, col_ix, x)
	Get the value of a single column at x. More...
pure real(dp) function, dimension(my_lt%n_cols), public	lt_get_mcol_at_loc (my_lt, loc)
	Get the values of all columns at a location. More...
elemental real(dp) function, public	lt_get_col_at_loc (my_lt, col_ix, loc)
	Get the value of a single column at a location. More...
pure subroutine, public	lt_get_data (my_lt, x_data, cols_rows)
	Get the x-coordinates and the columns of the lookup table. More...
pure subroutine, public	lt_lin_interp_list (x_list, y_list, x_value, y_value)
	Compute by use of linear interpolation the value in the middle. More...
subroutine, public	lt_to_file (my_lt, filename)
	Write the lookup table to file (in binary, potentially unportable) More...
subroutine, public	lt_from_file (my_lt, filename)
	Read the lookup table from file (in binary, potentially unportable) More...
type(lt2_t) function, public	lt2_create (x_min, x_max, n_points, n_cols)
	This function returns a new lookup table. More...
type(lt2_t) function, public	lt2_create_from_data (x_min, x_max, spaced_data)
	This function returns a new lookup table from regularly spaced data. More...
pure subroutine, public	lt2_set_col (my_lt, col_ix, x1, x2, y)
	Fill the column with index col_ix using linearly interpolated data. More...
elemental type(lt2_loc_t) function, public	lt2_get_loc (my_lt, x1, x2)
	Get a location in the lookup table. More...
elemental real(dp) function, public	lt2_get_col (my_lt, col_ix, x1, x2)
	Get the value of a single column at x. More...
elemental real(dp) function, public	lt2_get_col_at_loc (my_lt, col_ix, loc)
	Get the value of a single column at a location. More...
type(lt3_t) function, public	lt3_create (x_min, x_max, n_points, n_cols)
	This function returns a new lookup table. More...
type(lt3_t) function, public	lt3_create_from_data (x_min, x_max, spaced_data)
	This function returns a new lookup table from regularly spaced data. More...
elemental type(lt3_loc_t) function, public	lt3_get_loc (my_lt, x1, x2, x3)
	Get a location in the lookup table. More...
elemental real(dp) function, public	lt3_get_col (my_lt, col_ix, x1, x2, x3)
	Get the value of a single column at x. More...
elemental real(dp) function, public	lt3_get_col_at_loc (my_lt, col_ix, loc)
	Get the value of a single column at a location. More...

Detailed Description

A Fortran 90 module for creating 1D and 2D lookup tables. These tables can be used to efficiently interpolate one or more values.

Author: Jannis Teunissen

Function/Subroutine Documentation

find_index_adaptive()

pure integer function, public mod_lookup_table::find_index_adaptive	(	real(dp), dimension(:), intent(in)	list,
		real(dp), intent(in)	val
	)

Adaptive search (combination of linear and binary search) of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1.

Parameters

[in]	list	Sorted list
[in]	val	Value to search for

Definition at line 163 of file mod_lookup_table.t.

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find_index_bsearch()

pure integer function, public mod_lookup_table::find_index_bsearch	(	real(dp), dimension(:), intent(in)	list,
		real(dp), intent(in)	val
	)

Binary search of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1.

Parameters

[in]	list	Sorted list
[in]	val	Value to search for

Definition at line 137 of file mod_lookup_table.t.

find_index_linear()

pure integer function, public mod_lookup_table::find_index_linear	(	real(dp), dimension(:), intent(in)	list,
		real(dp), intent(in)	val
	)

Linear search of sorted list for the smallest ix such that list(ix) >= val. On failure, returns size(list)+1.

Parameters

[in]	list	Sorted list
[in]	val	Value to search for

Definition at line 125 of file mod_lookup_table.t.

lt2_create()

type(lt2_t) function, public mod_lookup_table::lt2_create	(	real(dp), dimension(2), intent(in)	x_min,
		real(dp), dimension(2), intent(in)	x_max,
		integer, dimension(2), intent(in)	n_points,
		integer, intent(in)	n_cols
	)

This function returns a new lookup table.

Parameters

[in]	x_min	Minimum coordinate
[in]	x_max	Maximum coordinate
[in]	n_points	How many values to store
[in]	n_cols	Number of variables that will be looked up

Definition at line 418 of file mod_lookup_table.t.

lt2_create_from_data()

type(lt2_t) function, public mod_lookup_table::lt2_create_from_data	(	real(dp), dimension(2), intent(in)	x_min,
		real(dp), dimension(2), intent(in)	x_max,
		real(dp), dimension(:, :, :), intent(in)	spaced_data
	)

This function returns a new lookup table from regularly spaced data.

Parameters

[in]	x_min	Minimum coordinate
[in]	x_max	Maximum coordinate
[in]	spaced_data	Input data of shape (nx, ny, n_cols)

Definition at line 439 of file mod_lookup_table.t.

lt2_get_col()

elemental real(dp) function, public mod_lookup_table::lt2_get_col	(	type(lt2_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		real(dp), intent(in)	x1,
		real(dp), intent(in)	x2
	)

Get the value of a single column at x.

Definition at line 512 of file mod_lookup_table.t.

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lt2_get_col_at_loc()

elemental real(dp) function, public mod_lookup_table::lt2_get_col_at_loc	(	type(lt2_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		type(lt2_loc_t), intent(in)	loc
	)

Get the value of a single column at a location.

Definition at line 524 of file mod_lookup_table.t.

lt2_get_loc()

elemental type(lt2_loc_t) function, public mod_lookup_table::lt2_get_loc	(	type(lt2_t), intent(in)	my_lt,
		real(dp), intent(in)	x1,
		real(dp), intent(in)	x2
	)

Get a location in the lookup table.

Definition at line 489 of file mod_lookup_table.t.

lt2_set_col()

pure subroutine, public mod_lookup_table::lt2_set_col	(	type(lt2_t), intent(inout)	my_lt,
		integer, intent(in)	col_ix,
		real(dp), dimension(:), intent(in)	x1,
		real(dp), dimension(:), intent(in)	x2,
		real(dp), dimension(:, :), intent(in)	y
	)

Fill the column with index col_ix using linearly interpolated data.

Definition at line 463 of file mod_lookup_table.t.

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lt3_create()

type(lt3_t) function, public mod_lookup_table::lt3_create	(	real(dp), dimension(3), intent(in)	x_min,
		real(dp), dimension(3), intent(in)	x_max,
		integer, dimension(3), intent(in)	n_points,
		integer, intent(in)	n_cols
	)

This function returns a new lookup table.

Parameters

[in]	x_min	Minimum coordinate
[in]	x_max	Maximum coordinate
[in]	n_points	How many values to store
[in]	n_cols	Number of variables that will be looked up

Definition at line 546 of file mod_lookup_table.t.

lt3_create_from_data()

type(lt3_t) function, public mod_lookup_table::lt3_create_from_data	(	real(dp), dimension(3), intent(in)	x_min,
		real(dp), dimension(3), intent(in)	x_max,
		real(dp), dimension(:, :, :, :), intent(in)	spaced_data
	)

This function returns a new lookup table from regularly spaced data.

Parameters

[in]	x_min	Minimum coordinate
[in]	x_max	Maximum coordinate
[in]	spaced_data	Input data of shape (nx, ny, nz, n_cols)

Definition at line 567 of file mod_lookup_table.t.

lt3_get_col()

elemental real(dp) function, public mod_lookup_table::lt3_get_col	(	type(lt3_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		real(dp), intent(in)	x1,
		real(dp), intent(in)	x2,
		real(dp), intent(in)	x3
	)

Get the value of a single column at x.

Definition at line 616 of file mod_lookup_table.t.

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lt3_get_col_at_loc()

elemental real(dp) function, public mod_lookup_table::lt3_get_col_at_loc	(	type(lt3_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		type(lt3_loc_t), intent(in)	loc
	)

Get the value of a single column at a location.

Definition at line 628 of file mod_lookup_table.t.

lt3_get_loc()

elemental type(lt3_loc_t) function, public mod_lookup_table::lt3_get_loc	(	type(lt3_t), intent(in)	my_lt,
		real(dp), intent(in)	x1,
		real(dp), intent(in)	x2,
		real(dp), intent(in)	x3
	)

Get a location in the lookup table.

Definition at line 593 of file mod_lookup_table.t.

lt_add_col()

pure subroutine, public mod_lookup_table::lt_add_col	(	type(lt_t), intent(inout)	my_lt,
		real(dp), dimension(:), intent(in)	x,
		real(dp), dimension(:), intent(in)	y
	)

Add a new column by linearly interpolating the (x, y) data.

Definition at line 260 of file mod_lookup_table.t.

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lt_create()

type(lt_t) function, public mod_lookup_table::lt_create	(	real(dp), intent(in)	x_min,
		real(dp), intent(in)	x_max,
		integer, intent(in)	n_points,
		integer, intent(in)	n_cols
	)

This function returns a new lookup table.

Parameters

[in]	x_min	Minimum x-coordinate
[in]	x_max	Maximum x-coordinate
[in]	n_points	How many x-values to store
[in]	n_cols	Number of variables that will be looked up

Definition at line 179 of file mod_lookup_table.t.

lt_create_from_data()

type(lt_t) function, public mod_lookup_table::lt_create_from_data	(	real(dp), intent(in)	x_min,
		real(dp), intent(in)	x_max,
		real(dp), dimension(:, :), intent(in)	spaced_data
	)

This function returns a new lookup table from regularly spaced data.

Parameters

[in]	x_min	Minimum coordinate
[in]	x_max	Maximum coordinate
[in]	spaced_data	Input data of shape (n_points, n_cols)

Definition at line 202 of file mod_lookup_table.t.

lt_from_file()

subroutine, public mod_lookup_table::lt_from_file	(	type(lt_t), intent(inout)	my_lt,
		character(len=*), intent(in)	filename
	)

Read the lookup table from file (in binary, potentially unportable)

Definition at line 396 of file mod_lookup_table.t.

lt_get_col()

elemental real(dp) function, public mod_lookup_table::lt_get_col	(	type(lt_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		real(dp), intent(in)	x
	)

Get the value of a single column at x.

Definition at line 312 of file mod_lookup_table.t.

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lt_get_col_at_loc()

elemental real(dp) function, public mod_lookup_table::lt_get_col_at_loc	(	type(lt_t), intent(in)	my_lt,
		integer, intent(in)	col_ix,
		type(lt_loc_t), intent(in)	loc
	)

Get the value of a single column at a location.

Definition at line 334 of file mod_lookup_table.t.

lt_get_data()

pure subroutine, public mod_lookup_table::lt_get_data	(	type(lt_t), intent(in)	my_lt,
		real(dp), dimension(:), intent(out)	x_data,
		real(dp), dimension(:, :), intent(out)	cols_rows
	)

Get the x-coordinates and the columns of the lookup table.

Definition at line 345 of file mod_lookup_table.t.

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lt_get_loc()

elemental type(lt_loc_t) function, public mod_lookup_table::lt_get_loc	(	type(lt_t), intent(in)	my_lt,
		real(dp), intent(in)	x
	)

Get a location in the lookup table.

Definition at line 280 of file mod_lookup_table.t.

lt_get_mcol()

pure real(dp) function, dimension(my_lt%n_cols), public mod_lookup_table::lt_get_mcol	(	type(lt_t), intent(in)	my_lt,
		real(dp), intent(in)	x
	)

Get the values of all columns at x.

Definition at line 301 of file mod_lookup_table.t.

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lt_get_mcol_at_loc()

pure real(dp) function, dimension(my_lt%n_cols), public mod_lookup_table::lt_get_mcol_at_loc	(	type(lt_t), intent(in)	my_lt,
		type(lt_loc_t), intent(in)	loc
	)

Get the values of all columns at a location.

Definition at line 324 of file mod_lookup_table.t.

lt_get_spaced_data()

pure real(dp) function, dimension(size(new_x)), public mod_lookup_table::lt_get_spaced_data	(	real(dp), dimension(:), intent(in)	in_x,
		real(dp), dimension(:), intent(in)	in_y,
		real(dp), dimension(:), intent(in)	new_x
	)

Linearly interpolate the (x, y) input data to the new_x coordinates.

Definition at line 238 of file mod_lookup_table.t.

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lt_get_xdata()

pure real(dp) function, dimension(n_points), public mod_lookup_table::lt_get_xdata	(	real(dp), intent(in)	x_min,
		real(dp), intent(in)	dx,
		integer, intent(in)	n_points
	)

Returns the x-coordinates of the lookup table.

Definition at line 226 of file mod_lookup_table.t.

lt_lin_interp_list()

pure subroutine, public mod_lookup_table::lt_lin_interp_list	(	real(dp), dimension(:), intent(in)	x_list,
		real(dp), dimension(:), intent(in)	y_list,
		real(dp), intent(in)	x_value,
		real(dp), intent(out)	y_value
	)

Compute by use of linear interpolation the value in the middle.

Definition at line 359 of file mod_lookup_table.t.

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lt_set_col()

pure subroutine, public mod_lookup_table::lt_set_col	(	type(lt_t), intent(inout)	my_lt,
		integer, intent(in)	col_ix,
		real(dp), dimension(:), intent(in)	x,
		real(dp), dimension(:), intent(in)	y
	)

Fill the column with index col_ix using the linearly interpolated (x, y) data.

Definition at line 250 of file mod_lookup_table.t.

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lt_to_file()

subroutine, public mod_lookup_table::lt_to_file	(	type(lt_t), intent(in)	my_lt,
		character(len=*), intent(in)	filename
	)

Write the lookup table to file (in binary, potentially unportable)

Definition at line 382 of file mod_lookup_table.t.