.TH "specunpack.c" 3 "Tue May 3 2022" "Version 1.6.4" "NCEPLIBS-g2c" \" -*- nroff -*-
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.SH NAME
specunpack.c \- Unpack a spectral data field that was packed using the complex packing algorithm for spherical harmonic data\&.  

.SH SYNOPSIS
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.PP
\fC#include <stdio\&.h>\fP
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\fC#include <stdlib\&.h>\fP
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\fC#include <math\&.h>\fP
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\fC#include 'grib2\&.h'\fP
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.SS "Functions"

.in +1c
.ti -1c
.RI "\fBg2int\fP \fBspecunpack\fP (unsigned char *cpack, \fBg2int\fP *idrstmpl, \fBg2int\fP ndpts, \fBg2int\fP JJ, \fBg2int\fP KK, \fBg2int\fP MM, \fBg2float\fP *fld)"
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.RI "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\&. "
.in -1c
.SH "Detailed Description"
.PP 
Unpack a spectral data field that was packed using the complex packing algorithm for spherical harmonic data\&. 


.PP
\fBAuthor\fP
.RS 4
Stephen Gilbert 
.RE
.PP
\fBDate\fP
.RS 4
2000-06-21 
.RE
.PP

.PP
Definition in file \fBspecunpack\&.c\fP\&.
.SH "Function Documentation"
.PP 
.SS "\fBg2int\fP specunpack (unsigned char * cpack, \fBg2int\fP * idrstmpl, \fBg2int\fP ndpts, \fBg2int\fP JJ, \fBg2int\fP KK, \fBg2int\fP MM, \fBg2float\fP * fld)"

.PP
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\&. 
.PP
\fBParameters\fP
.RS 4
\fIcpack\fP pointer to the packed data field\&. 
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\fIidrstmpl\fP pointer to the array of values for Data Representation Template 5\&.51\&. 
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\fIndpts\fP The number of data values to unpack (real and imaginary parts)\&. 
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\fIJJ\fP pentagonal resolution parameter\&. 
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\fIKK\fP pentagonal resolution parameter\&. 
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\fIMM\fP pentagonal resolution parameter\&. 
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\fIfld\fP Contains the unpacked data values\&. fld must be allocated with at least ndpts*sizeof(g2float) bytes before calling this routine\&.
.RE
.PP
\fBReturns\fP
.RS 4
0 for success, -3 for wrong type\&.
.RE
.PP
\fBAuthor\fP
.RS 4
Stephen Gilbert 
.RE
.PP
\fBDate\fP
.RS 4
2000-06-21 
.RE
.PP

.PP
Definition at line 34 of file specunpack\&.c\&.
.PP
References gbits(), int_power(), and rdieee()\&.
.PP
Referenced by g2_unpack7()\&.
.SH "Author"
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Generated automatically by Doxygen for NCEPLIBS-g2c from the source code\&.