Re: Gnuplot ignoring missing data (fwd)

Was my question too hard to answer, or merely mis-phrased?  I simply want 
to know whether I have misunderstood the meaning of "set datafile missing" 
or should I be reporting it as a Gnuplot bug?

I don't like reporting bugs if it turns out to be my fault...

-- Dave

---------- Forwarded message ----------
Date: Mon, 8 Jul 2019 07:33:24 +1000 (EST)
From: Dave Horsfall <[email protected]>
To: Gnuplot Mailing List <[email protected]>
Subject: Re: Gnuplot ignoring missing data

Odd; I just noticed that another of my graphs has a discontinuity at missing 
data, yet I don't have the "set datafile missing 'x'" line, so what on earth 
could be wrong?  What have I not understood about missing data?

Taking that directive out of spamlog.gp indeed shows a discontinuity (see 
www.horsfall.org/spamlog-1.pdf) so something is definitely fishy here...

-- Dave

---------- Forwarded message ----------
Date: Sat, 6 Jul 2019 10:41:36 +1000 (EST)
From: Dave Horsfall <[email protected]>
To: Gnuplot Mailing List <[email protected]>
Subject: Gnuplot ignoring missing data

Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.

Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
there is missing data there thanks to my ISP cutting my fibre and taking ages 
to fix it (great anti-spam measure, I suppose).

In my spamlog.gp, I have:

     set datafile    missing "x"
     ...
     plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
     ...

Sample line from spamlog.dat:

     2019/04/26      x x x x x x x x x
     (Actually tabs, not spaces)

Have I misunderstood what "missing" means?  It's been a while since I studied 
stats...  My understanding is just that: missing data, hence leave a hole in 
your graph (indistinguishable from zero in my case, but I can handle that).

A message on StackOverflow also says that the above should work and not draw a 
line across it (not that I trust StackOverflow anyway), but that's exactly what 
Gnuplot is doing.

Thanks.

-- Dave


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