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Solving elliptic equation in IDL [message #36102]

Sun, 17 August 2003 16:35

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Hi guys

I want to solve an elliptic equation on a rectangular portion of the
(x,y) plane, specifically

L(A) = f(x,y)

where A is an unknown, scalar-valued 2D array, L is the Laplacian
operator (d2/dx2 + d2/dy2) and the RHS (forcing) term is a function of
space only. A is specified at the boundary.

This can be done with an elliptic equation solver, of the type that
can be found in many general-purpose mathematical libraries. However a
Google search has not uncovered any IDL code to do this. So I have two
questions:

- Does anyone have or know of an IDL elliptic equation solver?

- If I choose to solve the equation in Fortran (Compaq Visual
Fortran 6.6B, IMSL Fortran Library,IDL 6.0, Windows 2000), what is the
path of least resistance for passing data between Fortran and IDL? A
DLM? Can I call a Fortran subroutine directly from IDL or will I
need to write glue code in C?

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Solving elliptic equation in IDL By: Mark Hadfield on Sun, 17 August 2003 16:35
		Re: Solving elliptic equation in IDL By: dallimor on Thu, 28 August 2003 02:31
		Re: Solving elliptic equation in IDL By: Mark Hadfield on Thu, 28 August 2003 13:12
		Re: Solving elliptic equation in IDL By: Mark Hadfield on Wed, 27 August 2003 15:17

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