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.help gssub Aug85 "Gsurfit Package"
.ih
NAME
gssub -- subtract surface 1 from surface 2
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SYNOPSIS
gssub (sf1, sf2, sf3)
.nf
pointer sf1 # first surface descriptor
pointer sf2 # second surface descriptor
pointer sf3 # resultant surface descriptor
.fi
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ARGUMENTS
.ls sf1
Pointer to the first surface descriptor.
.le
.ls sf2
Pointer to the second surface descriptor.
.le
.ls sf3
Pointer to the resultant surface descriptor.
.le
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DESCRIPTION
The coefficients of surface 2 are subtracted from surface 1. GSSUB checks
that the surface_types are the same and that the fits are normalized over
the same range of data.
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NOTES
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SEE ALSO
gscopy, gsadd
.endhelp
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