w3ft12.f File Reference

Fast fourier for 2.5 degree grid. More...

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Functions/Subroutines
subroutine	w3ft12 (coef, work, grid, trigs)
	Fast fourier to compute 145 grid values at desired latitude from 31 complex fourier coefficients.

Detailed Description

Fast fourier for 2.5 degree grid.

Author

Joe Sela

Date

1980-11-21

Definition in file w3ft12.f.

Function/Subroutine Documentation

w3ft12()

subroutine w3ft12	(	real, dimension( 62 )	coef,
		real, dimension(144)	work,
		real, dimension(145)	grid,
		real, dimension(216)	trigs
	)

Fast fourier to compute 145 grid values at desired latitude from 31 complex fourier coefficients.

This subroutine is special purpose for converting coefficients to a 2.5 degree lat,lon grid.

Program History Log:

Date	Programmer	Comment
1980-11-21	Joe Sela	Initial.
1984-06-21	Ralph Jones	Change to ibm vs fortran.
1993-04-12	Ralph Jones	Change to cray cft77 fortran.

Parameters

[in]	COEF	31 complex fourier coefficients.
[in]	TRIGS	216 trig functions assumed precomputed by w3fa13() before first call to w3ft12().
[in]	WORK	144 real work space
[out]	GRID	145 grid values, grid(1)=grid(145)

Author

Joe Sela

Date

1980-11-21

Definition at line 24 of file w3ft12.f.