1 files changed, 50 insertions, 0 deletions
diff --git a/sys/plio/zzsum.x b/sys/plio/zzsum.x
new file mode 100644
index 00000000..2e6097f9
--- /dev/null
+++ b/sys/plio/zzsum.x
@@ -0,0 +1,50 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <pmset.h>
+
+task    sum = t_sum
+
+# SUM -- Sum the image pixels lying within the given mask.
+
+procedure t_sum()
+
+char    image[SZ_FNAME]              # input data image
+char    mask[SZ_FNAME]               # image mask
+
+int     npix, mval, totpix, m_flags
+long    v[PM_MAXDIM]
+pointer im, mp, pp
+real    sum
+
+bool	clgetb()
+real    asumr()
+int     mio_glsegr()
+pointer immap(), mio_open()
+
+begin
+	call clgstr ("image", image, SZ_FNAME)
+	call clgstr ("mask", mask, SZ_FNAME)
+	m_flags = 0
+	if (clgetb ("invert"))
+	    m_flags = INVERT_MASK
+
+	im = immap (image, READ_ONLY, 0)
+	mp = mio_open (mask, m_flags, im)
+
+	sum = 0;  totpix = 0
+	while (mio_glsegr (mp, pp, mval, v, npix) != EOF) {
+	    sum = sum + asumr (Memr[pp], npix)
+	    totpix = totpix + npix
+	}
+
+	call mio_close (mp)
+	call imunmap (im)
+
+	call printf ("%d pixels, sum=%g, mean=%g\n")
+	    call pargi (totpix)
+	    call pargr (sum)
+	    if (totpix > 0)
+		call pargr (sum / totpix)
+	    else
+		call pargr (INDEF)
+end