datafile misparsing if non-numeric y

[Jonathan T. <jt...@as...>]

Consider the following datafile:

1.5     0.3
2.5     undef
3.5     0.6

With gnuplot 4.6.3 (full "show version long" output below) I get the
following results:

gnuplot> plot '/tmp/try-alpha.dat'

This plots three points: (1.5,0.3), (1.0,2.5), and (3.5,0.6).
It seems to me that the second of these is wrong: it has an x coordinate
which does not occur anywhere in the data file, and a bogus y coordinate
too.  I get the same behavior if I change the "undef" to "foo".

For what it's worth,

gnuplot> plot '/tmp/try-alpha.dat' using 1:2

simply ignores the point-with-non-numeric-y as expected.



Here's the output of 'show version long' for my gnuplot:

gnuplot> show version long

        G N U P L O T
        Version 4.6 patchlevel 3    last modified 2013-04-12 
        Build System: OpenBSD amd64

        Copyright (C) 1986-1993, 1998, 2004, 2007-2013
        Thomas Williams, Colin Kelley and many others

        gnuplot home:     http://www.gnuplot.info
        faq, bugs, etc:   type "help FAQ"
        immediate help:   type "help"  (plot window: hit 'h')
Compile options:
-READLINE  +LIBREADLINE  -HISTORY  
-BACKWARDS_COMPATIBILITY  +BINARY_DATA  
+GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION  
-USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE  
+DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  +USER_LINETYPES +STATS 

GNUPLOT_DRIVER_DIR = "/usr/local/libexec/gnuplot/4.6"
GNUPLOT_PS_DIR     = "/usr/local/share/gnuplot/4.6/PostScript"
HELPFILE           = "/usr/local/share/gnuplot/4.6/gnuplot.gih"

gnuplot> 

ciao,

-- 
-- "Jonathan Thornburg [remove -animal to reply]" <jt...@as...>
   Dept of Astronomy & IUCSS, Indiana University, Bloomington, Indiana, USA
   "There was of course no way of knowing whether you were being watched
    at any given moment.  How often, or on what system, the Thought Police
    plugged in on any individual wire was guesswork.  It was even conceivable
    that they watched everybody all the time."  -- George Orwell, "1984"