.help gsgcoeff Aug85 "Gsurfit Package"
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NAME
gsgcoeff -- Procedure to fetch a coefficient
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SYNOPSIS
rval = gsgcoeff (sf, xorder, yorder)

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    pointer	sf	# surface descriptor	
    int		xorder	# x order of desired coefficient
    int		yorder	# y order of desired coefficient
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ARGUMENTS
.ls sf    
Pointer to the surface descriptor.
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.ls xorder, yorder
The x and y order of the desired coefficient.
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DESCRIPTION
GSGCOEFF fetches the coefficient of x ** (xorder - 1) * y ** (yorder - 1).
INDEF is returned if xorder and yorder are out of range.
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NOTES
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SEE ALSO
gsscoeff
.endhelp
