specunpack.c File Reference

Unpack a spectral data field that was packed using the complex packing algorithm for spherical harmonic data. More...

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "grib2_int.h"

Go to the source code of this file.

Functions
g2int	specunpack (unsigned char *cpack, g2int *idrstmpl, g2int ndpts, g2int JJ, g2int KK, g2int MM, float *fld)
	This subroutine unpacks a spectral data field that was packed using the complex packing algorithm for spherical harmonic data as defined in the GRIB2 documention, using info from the GRIB2 Data Representation Template 5.51. More...

Detailed Description

Unpack a spectral data field that was packed using the complex packing algorithm for spherical harmonic data.

Author

Stephen Gilbert

Date

2000-06-21

Definition in file specunpack.c.

Function Documentation

specunpack()

g2int specunpack	(	unsigned char *	cpack,
		g2int *	idrstmpl,
		g2int	ndpts,
		g2int	JJ,
		g2int	KK,
		g2int	MM,
		float *	fld
	)

This subroutine unpacks a spectral data field that was packed using the complex packing algorithm for spherical harmonic data as defined in the GRIB2 documention, using info from the GRIB2 Data Representation Template 5.51.

Parameters

cpack	pointer to the packed data field.
idrstmpl	pointer to the array of values for Data Representation Template 5.51.
ndpts	The number of data values to unpack (real and imaginary parts).
JJ	pentagonal resolution parameter.
KK	pentagonal resolution parameter.
MM	pentagonal resolution parameter.
fld	Contains the unpacked data values. fld must be allocated with at least ndpts * sizeof(float) bytes before calling this routine.

Returns

0 for success, -3 for wrong type.

Author

Stephen Gilbert

Date

2000-06-21

Definition at line 35 of file specunpack.c.

References G2_NO_ERROR, G2_SPECUNPACK_TYPE, gbits(), int_power(), and rdieee().

Referenced by g2c_unpack7_int().