gpsprof with altitude works again on garmin GPS 18USB.

NaN is problematic in Python, use PosInf instead until isnan is in the
standard Python library.

1 files changed, 1 insertions, 1 deletions

diff --git a/gpsprof b/gpsprof
index 67095663..2f3b32b4 100755
--- a/gpsprof
+++ b/gpsprof
@@ -121,7 +121,7 @@ class spaceplot:
         fmt += 'plot cx(t, cep),cy(t, cep) title "CEP (50%%) = %f meters",  ' % (cep_meters)
         fmt += ' "-" using 1:2 with points ls 3 title "%d GPS fixes" ' % (len(self.fixes))
         if not gps.isnan(alt_avg):
-            fmt += ', "-" using ( %f ):($5 != NaN ? $5 - %f : Inf) axes x1y2 with points ls 2 title " %d Altitude fixes, Average = %f" \n' % (lon_max +1, alt_avg, alt_num, alt_avg)
+            fmt += ', "-" using ( %f ):($5 < 100000 ? $5 - %f : Inf) axes x1y2 with points ls 2 title " %d Altitude fixes, Average = %f" \n' % (lon_max +1, alt_avg, alt_num, alt_avg)
         else:
             fmt += "\n"
         fmt += self.header(session)