Repatch (from linux) of OSX IRAF

1 files changed, 39 insertions, 0 deletions

diff --git a/sys/vops/ak/ahgmc.x b/sys/vops/ak/ahgmc.x
new file mode 100644
index 00000000..b0917e8f
--- /dev/null
+++ b/sys/vops/ak/ahgmc.x
@@ -0,0 +1,39 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+
+# AHGM -- Accumulate the histogram of the input vector.  The output vector
+# HGM (the histogram) should be cleared prior to the first call.
+
+procedure ahgmc (data, npix, hgm, nbins, z1, z2)
+
+char 	data[ARB]		# data vector
+int	npix			# number of pixels
+int	hgm[ARB]		# output histogram
+int	nbins			# number of bins in histogram
+char	z1, z2			# greyscale values of first and last bins
+
+char	z
+real	dz
+int	bin, i
+
+begin
+	dz = real (nbins - 1) / real (z2 - z1)
+	if (abs (dz - 1.0) < (EPSILONR * 2.0)) {
+	    do i = 1, npix {
+		z = data[i]
+		if (z >= z1 && z <= z2) {
+		    bin = int (z - z1) + 1
+		    hgm[bin] = hgm[bin] + 1
+		}
+	    }
+	} else {
+	    do i = 1, npix {
+		z = data[i]
+		if (z >= z1 && z <= z2) {
+		    bin = int ((z - z1) * dz) + 1
+		    hgm[bin] = hgm[bin] + 1
+		}
+	    }
+	}
+end