1 files changed, 24 insertions, 0 deletions
diff --git a/sys/vops/lz/alogi.x b/sys/vops/lz/alogi.x
new file mode 100644
index 00000000..294289c5
--- /dev/null
+++ b/sys/vops/lz/alogi.x
@@ -0,0 +1,24 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ALOG -- Compute the logarithm to the base 10 of a vector (generic).  If the
+# logarithm is undefined (x <= 0) a user supplied function is called to get
+# the function value.
+
+procedure alogi (a, b, npix, errfcn)
+
+int	a[ARB], b[ARB]
+int	npix, i
+extern	errfcn()
+int	errfcn()
+errchk	errfcn
+
+begin
+	do i = 1, npix {
+		if (a[i] <= 0)
+		    b[i] = errfcn (a[i])
+		else {
+		    # Note Fortran standard forbids log10(cplx).
+			b[i] = log10 (real (a[i]))
+		}
+	}
+end