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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	"../icombine.h"
+
+
+# IC_AVERAGE -- Compute the average image line.
+# Options include a weight average.
+
+procedure ic_averager (d, m, n, wts, npts, average)
+
+pointer	d[ARB]			# Data pointers
+pointer	m[ARB]			# Image ID pointers
+int	n[npts]			# Number of points
+real	wts[ARB]		# Weights
+int	npts			# Number of output points per line
+real	average[npts]		# Average (returned)
+
+int	i, j, k
+real	sumwt, wt
+real	sum
+
+include	"../icombine.com"
+
+begin
+	# If no data has been excluded do the average without checking the
+	# number of points and using the fact that the weights are normalized.
+	# If all the data has been excluded set the average to the blank value.
+
+	if (dflag == D_ALL) {
+	    if (dowts) {
+		do i = 1, npts {
+		    k = i - 1
+		    wt = wts[Memi[m[1]+k]]
+		    sum = Memr[d[1]+k] * wt
+		    do j = 2, n[i] {
+			wt = wts[Memi[m[j]+k]]
+			sum = sum + Memr[d[j]+k] * wt
+		    }
+		    average[i] = sum
+		}
+	    } else {
+		do i = 1, npts {
+		    k = i - 1
+		    sum = Memr[d[1]+k]
+		    do j = 2, n[i]
+			sum = sum + Memr[d[j]+k]
+		    average[i] = sum / n[i]
+		}
+	    }
+	} else if (dflag == D_NONE) {
+	    do i = 1, npts
+		average[i] = blank
+	} else {
+	    if (dowts) {
+		do i = 1, npts {
+		    if (n[i] > 0) {
+			k = i - 1
+			wt = wts[Memi[m[1]+k]]
+			sum = Memr[d[1]+k] * wt
+			sumwt = wt
+			do j = 2, n[i] {
+			    wt = wts[Memi[m[j]+k]]
+			    sum = sum + Memr[d[j]+k] * wt
+			    sumwt = sumwt + wt
+			}
+			average[i] = sum / sumwt
+		    } else
+			average[i] = blank
+		}
+	    } else {
+		do i = 1, npts {
+		    if (n[i] > 0) {
+			k = i - 1
+			sum = Memr[d[1]+k]
+			do j = 2, n[i]
+			    sum = sum + Memr[d[j]+k]
+			average[i] = sum / n[i]
+		    } else
+			average[i] = blank
+		}
+	    }
+	}
+end