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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ADOT -- Vector inner or dot product.  The function value is the sum of the
+# products of each pair of elements of the input vectors.
+
+double procedure adotd (a, b, npix)
+
+double	a[ARB], b[ARB]
+
+double	sum
+
+int	npix, i
+
+begin
+	sum = 0.0D0
+	do i = 1, npix
+	    sum = sum + a[i] * b[i]
+
+	return (sum)
+end