From 9f8f6b4ac6d3cbb5a0c1346ca0d7f03a34010ccc Mon Sep 17 00:00:00 2001
From: Cees Bassa <cbassa@gmail.com>
Date: Fri, 20 Jan 2023 14:00:06 +0100
Subject: [PATCH] Fix time axis on missing data (fixes #38)

Signed-off-by: Cees Bassa <cbassa@gmail.com>
---
 rfplot.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rfplot.c b/rfplot.c
index def7df7..302666a 100644
--- a/rfplot.c
+++ b/rfplot.c
@@ -846,6 +846,17 @@ void time_axis(double *mjd,int n,float xmin,float xmax,float ymin,float ymax)
     imax=n-1;
   mjdmin=mjd[imin];
   mjdmax=mjd[imax];
+
+  // Do not plot axis if no data is available
+  if (mjdmin==0.0 && mjdmax==0.0)
+    return;
+
+  // Correct maximum
+  if (mjdmax==0.0) {
+    for (i=0;i<n;i++)
+      if (mjd[i]>mjdmax)
+	mjdmax=mjd[i];
+  }
   dt=(float) 86400*(mjdmax-mjdmin);
 
   // Choose tickmarks