NAME

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

SYNOPSIS

       #include <stdio.h>
       #include <stdlib.h>
       #include <math.h>
       #include 'grib2.h'

   Functions
       g2int specunpack (unsigned char *cpack, g2int *idrstmpl, g2int ndpts, g2int JJ, g2int KK,
           g2int MM, g2float *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.

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

   g2int specunpack (unsigned char * cpack, g2int * idrstmpl, g2int ndpts, g2int JJ, g2int KK,
       g2int MM, g2float * 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(g2float) bytes before calling this routine.

       Returns
           0 for success, -3 for wrong type.

       Author
           Stephen Gilbert

       Date
           2000-06-21

       Definition at line 34 of file specunpack.c.

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

       Referenced by g2_unpack7().

Author

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