NAME

       simpack.c - Pack up a data field using the simple packing algorithm.

SYNOPSIS

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

   Functions
       void simpack (g2float *fld, g2int ndpts, g2int *idrstmpl, unsigned char *cpack, g2int
           *lcpack)
           This subroutine packs up a data field using the simple packing algorithm as defined in
           the GRIB2 documention.

Detailed Description

       Pack up a data field using the simple packing algorithm.

       Author
           Stephen Gilbert

       Date
           2002-11-06

       Definition in file simpack.c.

Function Documentation

   void simpack (g2float * fld, g2int ndpts, g2int * idrstmpl, unsigned char * cpack, g2int *
       lcpack)
       This subroutine packs up a data field using the simple packing algorithm as defined in the
       GRIB2 documention. It also fills in GRIB2 Data Representation Template 5.0 with the
       appropriate values.

       Parameters
           fld Contains the data values to pack.
           ndpts The number of data values in array fld.
           idrstmpl Contains the array of values for Data Representation Template 5.0.

           • 0 Reference value - ignored on input - set by simpack routine.

           • 1 Binary Scale Factor - unchanged from input.

           • 2 Decimal Scale Factor - unchanged from input.

           • 3 Number of bits used to pack data, if value is > 0 and <= 31. If this input value
             is 0 or outside above range then the num of bits is calculated based on given data
             and scale factors.

           • 4 Original field type - currently ignored on input. Data values assumed to be reals.
             Set to 0 by simpack routine.

           cpack The packed data field
           lcpack length of packed field starting at cpack.

       Author
           Stephen Gilbert

       Date
           2002-11-06

       Definition at line 32 of file simpack.c.

       References int_power(), mkieee(), sbit(), and sbits().

       Referenced by g2_addfield(), and specpack().

Author

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