splaplac.f File Reference

Compute laplacian in spectral space. More...

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Functions/Subroutines
subroutine	splaplac (i, m, enn1, q, qd2, idir)
	Computes the laplacian or the inverse laplacian of a scalar field in spectral space.

Detailed Description

Compute laplacian in spectral space.

Author

Iredell

Date

92-10-31

Definition in file splaplac.f.

Function/Subroutine Documentation

splaplac()

subroutine splaplac	(		i,
			m,
		real, dimension((m+1)*((i+1)*m+2)/2)	enn1,
		real, dimension((m+1)*((i+1)*m+2))	q,
		real, dimension((m+1)*((i+1)*m+2))	qd2,
			idir
	)

Computes the laplacian or the inverse laplacian of a scalar field in spectral space.

Subprogram speps() should be called already.

The Laplacian of Q(L,N) is simply -N*(N+1)/A**2*Q(L,N)

Parameters

	I	spectral domain shape (0 for triangular, 1 for rhomboidal)
	M	spectral truncation
	ENN1	N*(N+1)/A**2
[out]	Q	if IDIR > 0, scalar field (Q(0,0) is not computed)
[out]	QD2	if IDIR < 0, Laplacian
	IDIR	flag IDIR > 0 to take Laplacian IDIR < 0 to take inverse Laplacian

Author

Iredell

Date

92-10-31

Definition at line 24 of file splaplac.f.

Referenced by sptgpmd(), sptgpsd(), sptgptd(), sptrand(), sptrungv(), sptrunl(), sptrunmv(), sptrunsv(), and sptrunv().