Back|Forward

DCL:MATH2:SHTLIB: Spherical Harmonic Functions: Explanation of Subroutines

4.3.11 SHTWGA

1.

Function

Performs inverse Fourier transformation, which corresponds to the latter half of the inverse spectral transformation, over a specified wavenumber interval.

2.

Definition

Transforms wave data W^m_(&phi) into grid data G_{(&lambda,&phi)} only within the wavenumber range M1≤|m|≤M2. See SHTW2G for the equations used in the transformation.

3.

Call

SHTWGA(MM,JM,IM,M1,M2,W,G,WORK)

4.

Explanation of Parameters

MM	(I)	Input parameter. The cut-off wavenumber (M).
JM	(I)	Input parameter. 1/2 of the NS partition number (J)
IM	(I)	Input parameter. 1/2 of the EW partition number (I)
M1	(I)	Input parameter. The minimum value in the wavenumber interval for transformation. (See above definition.)
M2	(I)	Input parameter. The maximum value in the wavenumber interval for transformation. (See above definition.)
W	(R)	Input parameter. Wave data. (For length and arrangement, see SHTS2W.)
G	(R)	出力. Grid data. (For length and arrangement, see SHTW2G.)
WORK	(R)	Working area initialized by SHTINT.

5.

Notes

(a)

This routine is equivalent to calling SHTW2G when M1=0, M2=MM is specified.