1 files changed, 55 insertions, 0 deletions
diff --git a/noao/onedspec/ecidentify/ecffit/ecfshift.x b/noao/onedspec/ecidentify/ecffit/ecfshift.x
new file mode 100644
index 00000000..75655703
--- /dev/null
+++ b/noao/onedspec/ecidentify/ecffit/ecfshift.x
@@ -0,0 +1,55 @@
+# ECF_GSHIFT -- Return the shift for the given order.
+
+double procedure ecf_gshift (ecf, order)
+
+pointer	ecf			# GSURFIT pointer
+int	order			# User order
+
+include	"ecffit.com"
+
+begin
+	return (shift / (slope * order + offset))
+end
+
+
+# ECF_PSHIFT -- Put the shift for the given order.
+
+procedure ecf_pshift (ecf, order, shft)
+
+pointer	ecf			# GSURFIT pointer
+int	order			# User order
+double	shft			# Shift at given order
+
+include	"ecffit.com"
+
+begin
+	shift = shft * (slope * order + offset)
+end
+
+
+procedure ecf_vector (ecf, order, x, fit, npts)
+
+pointer	ecf			# GSURFIT pointer
+int	order			# Order
+double	x[npts]			# X points
+double	fit[npts]		# Fitted points
+int	npts			# Number of points
+
+double	yval
+pointer	sp, y
+
+include	"ecffit.com"
+
+begin
+	call smark (sp)
+	call salloc (y, npts, TY_DOUBLE)
+
+	yval = slope * order + offset
+	call amovkd (yval, Memd[y], npts)
+	call dgsvector (ecf, x, Memd[y], fit, npts)
+	call adivkd (fit, yval, fit, npts)
+	if (shift != 0.)
+	    call aaddkd (fit, shift / yval, fit, npts)
+
+	call sfree (sp)
+end