gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] plotting points using a line of best fit function

[Thomas S. <t.s...@fz...>]

Ben Elliston <bje <at> air.net.au> writes:

> 
> On Fri, Jul 12, 2013 at 02:06:28PM +0000, Thomas Sefzick wrote:
> 
> > if you don't mind to plot 100 points at the same place
> > (no problem, unless you use a pen plotter):
> > 
> > plot "+" using (3),(f(3)) with points
> 
> That doesn't work. I get dozens of points along y=3, eg:
> 
>   f(x) = 2*x
>   plot f(x), "+" using (0),(f(0)) with points
> 
> Ben

sorry, a typing error in the 'using' option.

this should work:

plot f(x), "+" using (0):(f(0)) with points

Re: [Gnuplot-info] plotting points using a line of best fit function

[Ben E. <bj...@ai...>]

On Fri, Jul 12, 2013 at 02:06:28PM +0000, Thomas Sefzick wrote:

> if you don't mind to plot 100 points at the same place
> (no problem, unless you use a pen plotter):
> 
> plot "+" using (3),(f(3)) with points

That doesn't work. I get dozens of points along y=3, eg:

  f(x) = 2*x
  plot f(x), "+" using (0),(f(0)) with points

Ben

[Gnuplot-info] setting costum keys

[Mahmood N. <nt_...@ya...>]

Hi
It seems that "key" is the same as what I know as "legend". I have multiple plots in one chart. Problem is, when I set the keys, I see the full commands plus the line styles and colors. How can I set custom key for each plot? This is my command

unset key
plot "/path/to/data/file1" u 8 every ::2, "/path/to/data/file2" u 8 every ::2, "
 
Regards,
Mahmood

[Gnuplot-info] Color in a histogram

[ColorIsSweet <aik...@gm...>]

I'm making a bar histogram and I would like to draw each bar in a different
color.  Here's my data:

Silver/Gray                        1886923       29.963891005749588
White                              1265143       20.090171649127733
Black                              1258397       19.983046764474366
Red                                 712602       11.315951238327779
Blue                                565317       8.9771002694319471
Brown/Beige                         203033       3.2241160251745069
Yellow/Gold                         186990       2.9693569791481238
Green                               171534       2.7239193543034079
Other                                47384       0.7524467142625525

And here's my script 

set title "Histogram of machine color"
set grid 
set yrange [0:35]
set xrange [-.5:*]
set style data histograms 
set style fill solid 
set xtics border in scale 0,10  nomirror rotate by -45  
plot "percent.out" using 3:xticlabels(1) notitle 

I know there's some magic in the universe somewhere that will let me color
the histogram bars as gray, white, black, red, etc..  But what that magic
is, is beyond me.  Thanks in advance!






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Re: [Gnuplot-info] plotting points using a line of best fit function

[Thomas S. <t.s...@fz...>]

Ben Elliston <bje <at> air.net.au> writes:
> I have a line of best fit calculated using the "fit" command.  I'm
> trying to work out how to map new x axis values onto this function and
> plot these additional points.  If I do something like:
> 
>   plot f(3) with points
> 
> then I get a straight line at y=f(3).  Is there a way to plot (3,
> f(3)) instead?

if you don't mind to plot 100 points at the same place
(no problem, unless you use a pen plotter):

plot "+" using (3),(f(3)) with points

[Gnuplot-info] plotting points using a line of best fit function

[Ben E. <bj...@ai...>]

Hi.

I have a line of best fit calculated using the "fit" command.  I'm
trying to work out how to map new x axis values onto this function and
plot these additional points.  If I do something like:

  plot f(3) with points

then I get a straight line at y=f(3).  Is there a way to plot (3,
f(3)) instead?

Thanks, Ben

Re: [Gnuplot-info] set style fill transparent solid 0.5 "noborder" problem

[daebarkee <dae...@gm...>]

I found the issue.
This happens only in windows version.
In cygwin/x, the graph is fine.



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Re: [Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

BBands,
I found that using other terminals (such as post), I can see different sizes. However the x11 term which is the default terminal is not sensitive to font size!

 
Regards,
Mahmood



________________________________
 From: Mahmood Naderan <nt_...@ya...>
To: BBands <bb...@gm...>; gnuplot <gnu...@li...> 
Sent: Monday, July 8, 2013 9:40 PM
Subject: Re: [Gnuplot-info] title font size
 

These fonts are available on my system

$ ls /usr/share/fonts/
abyssinica      jomolhari           lklug             lohit-gujarati  lohit-tamil    paktype     thai-scalable
bitstream-vera  khmeros             lohit-assamese    lohit-kannada   lohit-telugu   sil-padauk  tibetan-machine-uni
default         kurdit-unikurd-web  lohit-bengali     lohit-oriya     madan          smc         un-core
dejavu          liberation          lohit-devanagari  lohit-punjabi   msttcorefonts  stix        vlgothic



Here is the output of "help fonts"
gnuplot> help fonts
 Gnuplot does not provide any fonts of its own. It relies on external font
 handling, the details of which unfortunately vary from one terminal type to
 another. Brief documentation of font mechanisms that apply to more than one
 terminal type is given here. For information on font use by other individual
 terminals, see the documentation for that terminal.

Subtopics available for fonts:
    cairo             gd                postscript



Now, there is no difference between these commands

gnuplot> set title "something" fonts "/usr/share/fonts/msttcorefonts/arial.ttf,10"
and
gnuplot> set title "something" fonts "/usr/share/fonts/msttcorefonts/arial.ttf,40"
 

What is wrong? I can not understand that!

Regards,
Mahmood



________________________________
From: BBands <bb...@gm...>
To: Mahmood Naderan <nt_...@ya...>; gnuplot <gnu...@li...> 
Sent: Monday, July 8, 2013 7:15 PM
Subject: Re: [Gnuplot-info] title font size


Mahmood,

As I understand it, the fonts are supplied by the distribution and gp
tries to make intelligent subs when it can't find an exact match. So,
the first hing I would do is check to see what fonts are installed and
use those directly. So, if you have super-duper-font installed and it
has a 30 point version: 'set title "something" font
"super-duper-font,30"'

'help fonts gd' gives some clues as to how gp looks for fonts.

On my version of Linux I have TrueType fonts installed, so 'set title
"something" font "Arial,30"' works.

Good plotting,

     John

On Mon, Jul 8, 2013 at 12:25 AM, Mahmood Naderan <nt_...@ya...> wrote:
> I have installed the very latest version from source (4.6 patchlevel 3). I
> can see some text for "help fonts cairo". However still I don't see any
> change in font size. That is important for me because I want to change the
> text size of the axis.
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Re: [Gnuplot-info] texts are not shown in epslatex

[Mahmood N. <nt_...@ya...>]

Thank you very much.


 
Regards,
Mahmood



________________________________
 From: Thomas Sefzick <t.s...@fz...>
To: gnu...@li... 
Sent: Tuesday, July 9, 2013 2:16 PM
Subject: Re: [Gnuplot-info] texts are not shown in epslatex
 

Mahmood Naderan <nt_mahmood <at> yahoo.com> writes:
>
> Hi
> I used "set term epslatex color", however in the output file I don't see
the texts (axis numbers, title,
> ....). On the other hand, if I use "set term x11", I see the texts. What
can cause this problem?
> 
>  
> Regards,
> Mahmood

the text (labels, headers, ...) is in the tex-file which
has been written together with the eps-file.

gnuplot_4.6 manual, page 189:
The driver produces two different files, one for the
eps part of the figure and one for the LaTeX part.
The name of the LaTeX file is taken from the set output
command. The name of the eps file is derived by
replacing the file extension (normally .tex) with
.eps instead.





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Re: [Gnuplot-info] texts are not shown in epslatex

[Thomas S. <t.s...@fz...>]

Mahmood Naderan <nt_mahmood <at> yahoo.com> writes:
>
> Hi
> I used "set term epslatex color", however in the output file I don't see
the texts (axis numbers, title,
> ....). On the other hand, if I use "set term x11", I see the texts. What
can cause this problem?
> 
>  
> Regards,
> Mahmood

the text (labels, headers, ...) is in the tex-file which
has been written together with the eps-file.

gnuplot_4.6 manual, page 189:
The driver produces two different files, one for the
eps part of the figure and one for the LaTeX part.
The name of the LaTeX file is taken from the set output
command. The name of the eps file is derived by
replacing the file extension (normally .tex) with
.eps instead.

[Gnuplot-info] texts are not shown in epslatex

[Mahmood N. <nt_...@ya...>]

Hi
I used "set term epslatex color", however in the output file I don't see the texts (axis numbers, title, ....). On the other hand, if I use "set term x11", I see the texts. What can cause this problem?

 
Regards,
Mahmood

[Gnuplot-info] set style fill transparent solid 0.5 "noborder" problem

[daebarkee <dae...@gm...>]

<http://gnuplot.10905.n7.nabble.com/file/n17482/StyleError.png> 

Hello All,

I found some weird case.
With "set style fill transparent solid 0.5 border", I can see the attached
graph.
This is weird. How come can we get this partially different graph?
Even worse case is with "set style fill transparent solid 0.5 noborder". I
cannot see the upper part in x=2.
I don't know why. :(

Here is my script:

reset
set terminal win 1
unset key
bm = 0.15
lm = 0.12
rm = 0.95
gap = 0.03
size = 0.75

# NOTE: the following numbers must be double. (Not integer)
y1 = 0.0; y2 = 300.0; y3 = 2000.0; y4 = 60000.0
lowerSizeRatio = 0.25

set multiplot
set xlabel 'Delay [Day]'
set border 1+2+8
set xtics nomirror
set ytics nomirror
set lmargin at screen lm
set rmargin at screen rm
set bmargin at screen bm
set tmargin at screen bm + size * (1.0 - gap) * lowerSizeRatio
set xrange [-15:20]
set yrange [y1:y2-1]
set ytics 50
set boxwidth 0.9 relative
set style fill transparent solid 0.5 border
plot "Data\\AZLT30Hist.txt" u 1:2 with boxes lc rgb"green"

unset xtics
unset xlabel
set border 2+4+8
set bmargin at screen bm + size * (1.0 - gap) * (lowerSizeRatio) + gap

set tmargin at screen bm + size + gap
set xrange [-15:20]
set yrange [y3+1:y4]
set ytics 10000

set boxwidth 0.9 relative
set style fill transparent solid 0.5 border
#set title 'Aztehc Event Delivery Delay (TimeAdded - Time)'

# broken axis lines
set arrow from screen lm - gap / 4.0, bm + size * (1.0 - gap) *
(lowerSizeRatio) - gap / 4.0 to screen \
lm + gap / 4.0, bm + size * (1.0 - gap)* (lowerSizeRatio) + gap / 4.0 nohead

set arrow from screen lm - gap / 4.0, bm + size * (1.0 - gap) *
(lowerSizeRatio ) - gap / 4.0  + gap to screen \
lm + gap / 4.0, bm + size * (1.0 - gap) * (lowerSizeRatio ) + gap / 4.0 +
gap nohead

set arrow from screen rm - gap / 4.0, bm + size * (1.0 - gap) *
(lowerSizeRatio ) - gap / 4.0 to screen \
rm + gap / 4.0, bm + size * (1.0 - gap) * (lowerSizeRatio ) + gap / 4.0
nohead

set arrow from screen rm - gap / 4.0, bm + size * (1.0 - gap) *
(lowerSizeRatio ) - gap / 4.0  + gap to screen \
rm + gap / 4.0, bm + size *  (1.0 - gap) * (lowerSizeRatio ) + gap / 4.0 +
gap nohead

plot "Data\\AZLT30Hist.txt" u 1:2 with boxes lc rgb"green"

unset multiplot





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Re: [Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

These fonts are available on my system

$ ls /usr/share/fonts/
abyssinica      jomolhari           lklug             lohit-gujarati  lohit-tamil    paktype     thai-scalable
bitstream-vera  khmeros             lohit-assamese    lohit-kannada   lohit-telugu   sil-padauk  tibetan-machine-uni
default         kurdit-unikurd-web  lohit-bengali     lohit-oriya     madan          smc         un-core
dejavu          liberation          lohit-devanagari  lohit-punjabi   msttcorefonts  stix        vlgothic



Here is the output of "help fonts"
gnuplot> help fonts
 Gnuplot does not provide any fonts of its own. It relies on external font
 handling, the details of which unfortunately vary from one terminal type to
 another. Brief documentation of font mechanisms that apply to more than one
 terminal type is given here. For information on font use by other individual
 terminals, see the documentation for that terminal.

Subtopics available for fonts:
    cairo             gd                postscript



Now, there is no difference between these commands

gnuplot> set title "something" fonts "/usr/share/fonts/msttcorefonts/arial.ttf,10"
and
gnuplot> set title "something" fonts "/usr/share/fonts/msttcorefonts/arial.ttf,40"
 

What is wrong? I can not understand that!

Regards,
Mahmood



________________________________
 From: BBands <bb...@gm...>
To: Mahmood Naderan <nt_...@ya...>; gnuplot <gnu...@li...> 
Sent: Monday, July 8, 2013 7:15 PM
Subject: Re: [Gnuplot-info] title font size
 

Mahmood,

As I understand it, the fonts are supplied by the distribution and gp
tries to make intelligent subs when it can't find an exact match. So,
the first hing I would do is check to see what fonts are installed and
use those directly. So, if you have super-duper-font installed and it
has a 30 point version: 'set title "something" font
"super-duper-font,30"'

'help fonts gd' gives some clues as to how gp looks for fonts.

On my version of Linux I have TrueType fonts installed, so 'set title
"something" font "Arial,30"' works.

Good plotting,

     John

On Mon, Jul 8, 2013 at 12:25 AM, Mahmood Naderan <nt_...@ya...> wrote:
> I have installed the very latest version from source (4.6 patchlevel 3). I
> can see some text for "help fonts cairo". However still I don't see any
> change in font size. That is important for me because I want to change the
> text size of the axis.

Re: [Gnuplot-info] title font size

[BBands <bb...@gm...>]

Mahmood,

As I understand it, the fonts are supplied by the distribution and gp
tries to make intelligent subs when it can't find an exact match. So,
the first hing I would do is check to see what fonts are installed and
use those directly. So, if you have super-duper-font installed and it
has a 30 point version: 'set title "something" font
"super-duper-font,30"'

'help fonts gd' gives some clues as to how gp looks for fonts.

On my version of Linux I have TrueType fonts installed, so 'set title
"something" font "Arial,30"' works.

Good plotting,

     John

On Mon, Jul 8, 2013 at 12:25 AM, Mahmood Naderan <nt_...@ya...> wrote:
> I have installed the very latest version from source (4.6 patchlevel 3). I
> can see some text for "help fonts cairo". However still I don't see any
> change in font size. That is important for me because I want to change the
> text size of the axis.

Re: [Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

I have installed the very latest version from source (4.6 patchlevel 3). I can see some text for "help fonts cairo". However still I don't see any change in font size. That is important for me because I want to change the text size of the axis.

Any idea is greatly appreciated.
 
Regards,
Mahmood



________________________________
 From: Mahmood Naderan <nt_...@ya...>
To: BBands <bb...@gm...> 
Cc: gnuplot <gnu...@li...> 
Sent: Monday, July 8, 2013 9:34 AM
Subject: Re: [Gnuplot-info] title font size
 

Here is the info. I am using Scientific linux 6.3 and installed Gnuplot from the repository.

$ gnuplot

        G N U P L O T
        Version 4.2 patchlevel 6
        last modified Sep 2009
        System: Linux 2.6.32-279.5.1.el6.x86_64

        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
        Thomas Williams, Colin Kelley and many others

        Type `help` to access the on-line reference manual.
        The gnuplot FAQ is available from http://www.gnuplot.info/faq/

        Send bug reports and suggestions to <http://sourceforge.net/projects/gnuplot>


Terminal type set to 'x11'
gnuplot> help fonts cairo
Sorry, no help for 'fonts cairo'
gnuplot>



 
Regards,
Mahmood



________________________________
From: BBands <bb...@gm...>
To: Mahmood Naderan <nt_...@ya...> 
Cc: gnuplot <gnu...@li...> 
Sent: Sunday, July 7, 2013 11:39 PM
Subject: Re: [Gnuplot-info] title font size


Just guessing as you haven't informed us as to platform, version,
terminal, etc.: Using an old version of gp? Might be time to upgrade.

      John

On Sun, Jul 7, 2013 at 9:09 AM, Mahmood Naderan <nt_...@ya...> wrote:

>>type 'help fonts cairo'.
> It says "Sorry , no help for  'fonts cairo' "
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Re: [Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

Here is the info. I am using Scientific linux 6.3 and installed Gnuplot from the repository.

$ gnuplot

        G N U P L O T
        Version 4.2 patchlevel 6
        last modified Sep 2009
        System: Linux 2.6.32-279.5.1.el6.x86_64

        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
        Thomas Williams, Colin Kelley and many others

        Type `help` to access the on-line reference manual.
        The gnuplot FAQ is available from http://www.gnuplot.info/faq/

        Send bug reports and suggestions to <http://sourceforge.net/projects/gnuplot>


Terminal type set to 'x11'
gnuplot> help fonts cairo
Sorry, no help for 'fonts cairo'
gnuplot>



 
Regards,
Mahmood



________________________________
 From: BBands <bb...@gm...>
To: Mahmood Naderan <nt_...@ya...> 
Cc: gnuplot <gnu...@li...> 
Sent: Sunday, July 7, 2013 11:39 PM
Subject: Re: [Gnuplot-info] title font size
 

Just guessing as you haven't informed us as to platform, version,
terminal, etc.: Using an old version of gp? Might be time to upgrade.

      John

On Sun, Jul 7, 2013 at 9:09 AM, Mahmood Naderan <nt_...@ya...> wrote:

>>type 'help fonts cairo'.
> It says "Sorry , no help for  'fonts cairo' "

Re: [Gnuplot-info] title font size

[BBands <bb...@gm...>]

Just guessing as you haven't informed us as to platform, version,
terminal, etc.: Using an old version of gp? Might be time to upgrade.

      John

On Sun, Jul 7, 2013 at 9:09 AM, Mahmood Naderan <nt_...@ya...> wrote:

>>type 'help fonts cairo'.
> It says "Sorry , no help for  'fonts cairo' "

Re: [Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

>Try:
>    set title "something" font "sans, 30"
>and report back.
No change....
 

>type 'help fonts cairo'.
It says "Sorry , no help for  'fonts cairo' "


Regards,
Mahmood



________________________________
 From: BBands <bb...@gm...>
To: Mahmood Naderan <nt_...@ya...>; gnuplot <gnu...@li...> 
Sent: Sunday, July 7, 2013 6:27 PM
Subject: Re: [Gnuplot-info] title font size
 

Fonts are handled externally and so are different from platform to
platform. I'm guessing that 'arial, 30' is not installed on your
computer, so gp is trying to do a substitution.

Try:
    set title "something" font "sans, 30"
and report back.

If you want to dig in, type 'help fonts cairo'. There you'll see a
link to the font config system help file.

Best,

    John

Re: [Gnuplot-info] title font size

[BBands <bb...@gm...>]

Fonts are handled externally and so are different from platform to
platform. I'm guessing that 'arial, 30' is not installed on your
computer, so gp is trying to do a substitution.

Try:
    set title "something" font "sans, 30"
and report back.

If you want to dig in, type 'help fonts cairo'. There you'll see a
link to the font config system help file.

Best,

    John

[Gnuplot-info] title font size

[Mahmood N. <nt_...@ya...>]

Hi
I want to change the font size of the title. However there is no difference between

set title "something" font "arial,30"
and
set title "something" font "arial,10"

Both of them are small (the default size). How can I fix that?

 
Regards,
Mahmood

[Gnuplot-info] Autoscaling

[dbrant <bra...@ho...>]

Hi gnuplotters

I am trying to plot a couple of trivial graphs using multiplot to get the
result shown.

<http://gnuplot.10905.n7.nabble.com/file/n17473/both_sideways.png> 

The code is:

reset
set term png enhanced background rgb"light-blue"
set output "both_sideways.png"

AutoScale=0.9

set multiplot layout 1,2 title "Now I can see this"
	set title "sine" 
	set xlabel "x"						#set xlable and ylabel
	set ylabel "y=sin(x)"
	#set a pink background color
	set object 1 rectangle from screen 0,0 to screen 0.5,AutoScale fillcolor
rgb"pink" behind
	plot sin(x) with lines linecolor rgb"light-green" notitle
	unset object 1
	set object 2 rectangle from screen 0.5,0 to screen 1,AutoScale fillcolor
rgb"light-green" behind
	set title "cosine" 	
	set ylabel "y=cos(x)"					#set ylable, xlabel set above
	#set a light-green background color
	plot cos(x) with lines linecolor rgb"pink" notitle
unset multiplot

The problem i have is defining AutoScale, which i have to guess. This
example uses 0.9 for ymax in screen mode (for want of a better term). Is
there a way to get gnuplot to automatically define AutoScale? I know it has
internal variables (GPVAL_?) that can be used after doing dummy plots to set
them. There must be one that defines the multiplot title region?

Dave



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Re: [Gnuplot-info] Use of multiplot with "set object"

[dbrant <bra...@ho...>]

Many thanks for the solution.
I was having problems with the multiplot title region being overwritten, but
this has cured it.



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Re: [Gnuplot-info] Use of multiplot with "set object"

[Ethan M. <eam...@gm...>]

On Fri, Jul 5, 2013 at 12:54 PM, dbrant <bra...@ho...> wrote:
> No luck i'm afraid. Using the following script with multiplot and set
> objects:
>
> reset
> set term png enhanced
> set output 'test.png'
> set object 1 rectangle from screen 0,0 to screen 1,1 behind fc rgb "red"
> set object 2 rectangle from graph 0,0 to graph 1,1 behind fc rgb "green"
> set title "dave"
> set xlabel "x1"
> set ylabel "y1"
> set multiplot layout 2, 1 title "Can you see this?"
> plot sin(x)/x
> unset object 1
> set object 2 fc rgb "blue"
> set title "brant"
> set xlabel "x2"
> set ylabel "y2"
> plot cos(x)/x
> unset multiplot
>
> I can see individual graph titles but not the multiplot title.
> It is there when the screen background is not coloured
> but when colored it blocks it out for some reason!
>

I think I missed your initial query with an explanation of what you
are trying to do.  But if the issue is simply that filling in the
background by using a rectangle has the side-effect of obscured some
plot elements or labels, the simple answer is to instead do

      set term png enhanced background rgb "red"

and skip the set object / unset object

Re: [Gnuplot-info] Use of multiplot with "set object"

[dbrant <bra...@ho...>]

No luck i'm afraid. Using the following script with multiplot and set
objects:

reset
set term png enhanced
set output 'test.png'
set object 1 rectangle from screen 0,0 to screen 1,1 behind fc rgb "red"
set object 2 rectangle from graph 0,0 to graph 1,1 behind fc rgb "green"
set title "dave"
set xlabel "x1"
set ylabel "y1"
set multiplot layout 2, 1 title "Can you see this?"
plot sin(x)/x
unset object 1
set object 2 fc rgb "blue"
set title "brant"
set xlabel "x2"
set ylabel "y2"
plot cos(x)/x
unset multiplot

I can see individual graph titles but not the multiplot title.

<http://gnuplot.10905.n7.nabble.com/file/n17470/test_no_object.png> 

It is there when the screen background is not coloured

<http://gnuplot.10905.n7.nabble.com/file/n17470/test_with_object.png> 

but when colored it blocks it out for some reason!



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Re: [Gnuplot-info] Showing a point at a specific location in a plot?

[Hans-Bernhard B. <HBB...@t-...>]

On 05.07.2013 11:53, Harald Servat wrote:
>     I found the solution in
>
>       http://www.gnuplotting.org/plotting-single-points/

Not to discredit that site, but that's not "the" solution.  It's one of 
several possible solutions, and not necessarily the best one either.

>     plot \
>     'file' using ((strcol(2) eq 'X' && $3 == 1) ? $4 / 1000000: NaN)
> : $0 ti 'Group X (9)' w points, \
>     "<echo '16'" using 1:$0 notitle with points;

I would prefer either of the following

     plot \
     'file' using ((strcol(2) eq 'X' && $3 == 1) ? $4 / 1000000: NaN)
         : $0 ti 'Group X (9)' w points, \
     "-" using 1:$0 notitle with points;
16
E

This would be simpler and more portable ("< " special file support 
doesn't work on traditional Windows builds of gnuplot).

Possibly even better:

     set label "" at 5,5 point pt 2
     plot \
     'file' using ((strcol(2) eq 'X' && $3 == 1) ? $4 / 1000000: NaN)
         : $0 ti 'Group X (9)' w points