I've got this code in an Emacs orgmode file:
#+begin_src gnuplot :exports results :file images/sinecosine.png
reset
set terminal png size 360, 360 enhanced
# Line styles
set border linewidth 1
set style line 1 linecolor rgb '#0060ad' linetype 1 linewidth 1 # blue
set style line 2 linecolor rgb '#dd181f' linetype 1 linewidth 1 # red
# Legend
set key at 6.1,1.3
# Axes label
set xlabel 'x'
set ylabel 'y'
set xzeroaxis linetype 2 linewidth 1
set yzeroaxis linetype 2 linewidth 1
# Axis ranges
set xrange[-2*pi:2*pi]
set yrange[-1.5:1.5]
# Axis labels
set xtics ("-2{/Symbol P}" -2*pi, "-{/Symbol P}" -pi, 0, "{/Symbol P}" pi, "2{/Symbol P}" 2*pi)
set ytics 1
set tics scale 0.75
# Functions to plot
a = 0.9
f(x) = a * sin(x)
g(x) = a * cos(x)
# Plot
plot f(x) title 'sin(x)' with lines ls 1, \
g(x) notitle with lines ls 2
#+end_src
and it gives a gnuplot (3.7) without the proper pi symbol -- just like in this and this post. Yes, I can get the eps version of this to work, but not this png (or svg) version, which is needed for HTML export. Any new ideas?
Update
Here is the stand-alone code I've tried -- successfully:
reset
set encoding utf8
set terminal svg enhanced fname 'Times New Roman' rounded dashed standalone
set output "gp-test4-output.svg"
# Line styles
set border linewidth 1
set style line 1 linecolor rgb '#0060ad' linetype 1 linewidth 1 # blue
set style line 2 linecolor rgb '#dd181f' linetype 1 linewidth 1 # red
# Legend
set key at 6.1,1.3
# Axes label
set xlabel 'x'
set ylabel 'y'
set xzeroaxis linetype 2 linewidth 1
set yzeroaxis linetype 2 linewidth 1
# Axis ranges
set xrange[-2*pi:2*pi]
set yrange[-1.5:1.5]
# Axis labels
set xtics ("-2Π" -2*pi, "-Π" -pi, 0, "Π" pi, "2Π" 2*pi)
set ytics 1
set tics scale 0.75
# Functions to plot
a = 0.9
f(x) = a * sin(x)
g(x) = a * cos(x)
# Plot
plot f(x) title 'sin(x)' with lines ls 1, \
g(x) notitle with lines ls 2
I've swapped out the {/Symbol P} for Π. From a terminal command line I've gotten it to work and produce just fine. The Ubuntu repo did install the latest-greatest gnuplot (gnuplot 5.2 patchlevel 6). So doing the experiment again, when I C-c C-c in the org-mode codeblock I get
gnuplot-mode 0.7-beta (gnuplot 3.7) -- report bugs with "C-c C-u"
and the same error: junk instead of Π. (Not sure what the gnuplot 3.7 is about.) Running the codeblock above, BTW, starts a gnuplot REPL, and it says it's latest-greatest gnuplot. But when the stand-alone code above in Emacs (with gnuplot-mode) is called a la "send buffer to gnuplot" (the Emacs gnuplot REPL) it gives the error, BUT when I "send file to gnuplot", it produces the Π error-free. Totally bizarre, IMHO.
Here's my subscriptions:
(setq package-archives '(("ELPA" . "http://tromey.com/elpa/")
("gnu" . "http://elpa.gnu.org/packages/")
("melpa" . "https://melpa.org/packages/")
("org" . "https://orgmode.org/elpa/")))
which gives two offerings for gnuplot modes:
gnuplot 20141231.2137 available melpa drive gnuplot from within emacs
and then this:
gnuplot-mode 20171013.1616 installed Major mode for editing gnuplot scripts
So then I uninstalled Emacs gnuplot (20141231.2137), then installed gnuplot-mode(20171013.1616). This solved the gnuplot-run-buffer problem, but the org-mode codeblock now gives this error:
executing Gnuplot code block...
org-babel-execute:gnuplot: Cannot open load file: No such file or directory, gnuplot
Searching customize I only find four variables associated with gnuplot, one being Gnuplot Program, which I have as /usr/bin/gnuplot. I'm on latest-greatest Emacs and org-mode in Ubuntu 19.04. How do I better tell org-babel where to find Gnuplot? I suspect this newer mode is not the intended partner for Emacs org-mode; however the older mode is not doing greek letters properly in org-mode.
Retrieving the character "pi" from the Adobe Symbol font is something from the PostScript world, where separate fonts with special encodings were used to work around the 256-character limit inherent in PostScript font encodings.
SVG, on the other hand, is an XML variant. It uses unicode entry points and (usually) UTF-8 encoding to access them. "pi" in an SVG file is either the byte sequence 0xCF 0x80 (UTF-8 encoding) or the XML predefined entity π .
gnuplot's "enhanced text" mode is not relevant here. I do not remember what limitations there might have been in gnuplot 3.7 that would affect passing either of these as normal text to the svg terminal. There are no such limitations in current gnuplot.
Related
I am using gracebat integrated into my bash script to make simple XY graph from 2D numerical data
gracebat input.xvg -hdevice PNG -fixed 800 600 -world 0 0.02 610 0.5 -printfile output.png -hardcopy
This simple execution without GUI produces the XY graph totally in black color!
would it be possible to quickly change to color of the line (I guess should be s0 color in the batch file) without using batch file for gracebat: e.g. via some option of gracebat or alternatively via editing of the input.xvg (via sed or any shell utility) specifying color or the line:
# s0 line color 2
Alternatively, if the grace has not good possibilities for graph customization, I would be grateful for simple example of the gnuplot batch execution.
What does xmgrace -help say? Please check the corresponding manuals and homepages and do a search on SO and the web before asking such questions. I don't now xmgrace and its documentation.
But a gnuplot command line would be using the command line option -e: (check help command line options).
gnuplot -e "set term pngcairo size 800,600; set output 'myFile.png'; plot 'myFile.dat' u 1:2 w l lc 'red' "
For the format of x-axis, current I am using the following command in pngcairo terminal:
set format x "%.sK"
Which recognizes numbers from 100K to 900K but when it gets to 1 million it prints "1K" instead of "1000K".
what is the command to automatically set the label to "xK" before 1 million and to "xM" after 1 million?
These kind of labels are controlled by gnuplot's own format specifiers (see doc for gprintf):
set format x '%.s%c'
I am a bit confused, I have the same gnuplot script that works under
Version 4.6 patchlevel 4 Build System: Linux x86_64
but not under
Version 4.6 patchlevel 5 Build System: MS-Windows 32 bit
the script file is
clear
set terminal epslatex size 20cm,14cm
set output 'mwe.tex'
set style data points
set style line 101 lc rgb "black" lw 2 pt 1 ps 2
set grid
set xlabel 'xlabel'
set ylabel 'ylabel'
xmin= -0.2
xmax= 0.7
set xrange [xmin:xmax]
set key below
plot "<echo '0.408 270.7'" with points ls 101 notitle,\
Does the command "<echo somehow not work under Windows?
The error I get with Windows is 'skipping unreadable file "
The < pipes the following command through a shell (see help special-filenames). The command itself is mostly system-dependent and not part of gnuplot (in this case the echo).
If you want a portable way to specify a single point, you can set an empty label and use the point option:
set style line 101 lc rgb "black" lw 2 pt 1 ps 2
set label at 0.408, 270.7 "" point ls 101
Note, that this works only if you also plot other stuff, since the label is set only if the plot command is invoked.
echo (lower case) is a unix command. In windows you will need to use "<ECHO in uppercase.
I'm trying to plot the 1st and 3rd columns of multiple files, where each file is supposed to be plotted to an own output.png.
My files have the following names:
VIB2--135--398.6241
VIB2--136--408.3192
VIB2--137--411.3725
...
The first number in the file name is an integer, which ranges from 135-162. The second number is just a decimal number and there is no regular spacing between the values.
Basically I want to do something like this
plot for [a=135:162] 'VIB2--'.a.'--*' u 1:3 w l
although this doesn't work, of course, since the ' * ' is just the placeholder I know from bash and I don't know, if there is something similar in gnuplot.
Furthermore, each of the files should be, as already said above, plotted to its own output.png, where the two numbers should be in the output name, e.g. VIB2--135--398.6241.png.
I tried to come up with a bash script for this, like (edited):
#!/bin/bash
for file in *
do
gnuplot < $file
set xtics 1
set xtics rotate
set terminal png size 1920,1080 enhanced
set output $file.png
plot "$file" u 1:3 w l
done
but I still get
gnuplot> 1 14 -0.05
^
line 0: invalid command
gnuplot> 2 14 0.01
^
line 0: invalid command
...
which are actually the numbers from my input file. So gnuplot thinks, that the numbers I want to plot are commands... ?? Also, when the end of the file is reached, I get the following error message
#PLOT 1
plot: an unrecognized command `0x20' was encountered in the input
plot: the input file `VIB2--162--496.0271' could not be parsed
I've seen a few questions similar to mine, but the solutions didn't really work for me and I cannot add a comment, since I do not have the reputation.
Please help me with this.
gnuplot < $file starts gnuplot and feeds it the content of $file as input. That means gnuplot will now try to execute the commands in the data file which doesn't work.
What you want is a "here document":
gnuplot <<EOF
set xtics 1
set xtics rotate
set terminal png size 1920,1080 enhanced
set output $file.png
plot "$file" u 1:3 w l
EOF
What this does is: The shell reads the text up to the line with solemn EOF, replaces all variables, puts that into a temporary file and then starts gnuplot feeding it the temporary file as input.
Be careful that the file names don't contain spaces, or set output $file.png will not work. To be safe, you should probably use set output "$file.png" but my gnuplot is a bit rusty.
For a very large data-set, how can gnuplot be used to only put tic marks/labels on the x axis for just the first and last data point?
With gnuplot 4.6 and up, you can use the commands
stats 'data.dat'
set xtics \
(sprintf("%.2g",STATS_min_x) STATS_min_x, \
sprintf("%.2g",STATS_max_x) STATS_max_x)
plot 'data.dat'
With other versions of gnuplot, you can use this similar sequence of commands:
# this setting makes sure we don't make an output right away
set terminal unknown
plot 'data.dat'
set xtics \
(sprintf("%.2g",GPVAL_DATA_X_MIN) GPVAL_DATA_X_MIN, \
sprintf("%.2g",GPVAL_DATA_X_MAX) GPVAL_DATA_X_MAX)
set terminal <actual terminal>
replot
The set xtics command takes comma-separated pairs of strings with data values, all inside parentheses.
(Here I assume you want the minimum and maximum, not the first and last, data points.)
For more info you can run these at the gnuplot command line:
help set format
help set stats
show variables all
I'm adding another answer because my other one really answered a different question, but may be useful. To answer the question,
How to mark the x tics for the first and last data points?
here is my method:
#!/usr/bin/env gnuplot
set terminal png
set output 'test.png'
# define a function to get the first and last values.
# this assumes the file has not changed since first running 'stats',
# (and contains at least one data point)
# `plot/stats 'data.dat' using (firstlast($x))`
# should be interchangable with
# `plot/stats 'data.dat' using x
# that is, the resulting variables should be the same
firstlast(x) = ($0==0) ? (first=$1, last=$1, $1) : (last=$1, $1)
# run stats to find the first and last values
# just on x data column
stats 'data.dat' u (firstlast($1)) nooutput
# set the x tics to the first and last x points
set xtics \
(sprintf("%.2g (first)", first) first, \
sprintf("%.2g (last)", last) last)
print first
print last
plot 'data.dat'
I used this example data file:
data.dat
1 1
2 2
3 3
4 2
0 3
and got this output: