specunpack.c(3) Library Functions Manual specunpack.c(3)

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

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


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

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.

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

Unpack 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().

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