tools Module Reference

Tools. More...

Public Member Functions
subroutine	runend (iflag, message)
	Program end. More...
subroutine	interp1d (getfx, f, x)
	1D Interpolation More...
subroutine	dfdx (f, df, n)
	Function Derivative. More...

Detailed Description

Tools.

Definition at line 5 of file tools.f90.

Member Function/Subroutine Documentation

subroutine tools::dfdx	(	real*8, dimension(2,n), intent(in)	f,
		real*8, dimension(2,n), intent(out)	df,
		integer, intent(in)	n
	)

Function Derivative.

This routine computes the discrete derivarive of a function f(x) at the base points where. The function f(2,n) and its derivative df(2,n) are stored as:

• f(1,i) x-coordinate of the the point i
• f(2,i) f(x) at the point i
• df(1,i) x-coordinate of the the point i
• df(2,i) df(x)/dx at the point i

Derivatives are calculated using a second order approximation
NOTE: Points do not need to be equally spaced, but they must be ordered on increasing values of x.

Date

13/11/2008

Parameters

f	function (input)
df	derivative (output)
n	n. of points (input)

Definition at line 189 of file tools.f90.

subroutine tools::interp1d	(	real*8, intent(out)	getfx,
		real*8, dimension(:,:), intent(in)	f,
		real*8, intent(in)	x
	)

1D Interpolation

This function interpolates values from a discrete function y=f(x).
The function is stored at n discrete points in an array f(2,n), where:

• f(1,i) = x-coordinate of the point i (i= 1:n);
• f(2,i) = f(x) of the point i (i= 1:n).

It returns the value of f(x) at a point x (where f(1,1) < x < f(1,n) ).
NOTE: It is assumed that the points are already increasingly ordered in x

Date

13/11/2008

Parameters

getfx	interpolated value (output)
f	array (x,f(x)) (input)
x	interp. point (input)

Definition at line 79 of file tools.f90.

subroutine tools::runend	(	integer, intent(in)	iflag,
		character, dimension(*), intent(in)	message
	)

Program end.

This routine ends the program according to the flag iflag:

• iflag = -1 => Abnormal termination
• iflag = 1 => Correct termination

Date

23/11/2008

Parameters

iflag	termination flag (input)
message	termination message (output)

Definition at line 23 of file tools.f90.

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

• src/tools.f90