I am used to plot data with gnuplot, so I can easily put the figures in a LaTeX document, using the epslatex terminal. For example:
file = "data.dat"
set terminal epslatex
set output "figure1.tex"
plot file
This way, two files are generated: one .eps file, which contains the graphics, and one .tex file, which contains the text. The great advantage of this is that text is rendered by LaTeX, so the tics, labels, etc. have the same font as the rest of the document.
Now I am starting with matplotlib, which has a much nicer API, is more scriptable and, well, is Python. But, even though I can make matplotlib render the text with LaTeX, it gets embedded into the image and I cannot achieve the same advantages I had with gnuplot.
Is there any way I can emulate the epslatex terminal in matplotlib?
Update: matplotlib 1.2 introduced a new PGF/TikZ backend, and I have successfully used it for the exact purpose stated in this question: make LaTeX / XeTeX render the text of the plot. In the documentation there are some nice examples of plotting using the PGF backend, including custom preambles, custom fonts and full unicode math support.
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So I have to write my lab report in Italian for my lab class. In class they taught us how to use gnuplot to create graphs, so I'm using it to produce our graphs, which then I need to put in my latex document. The problem is that I have to set the label on the y axes as "velocità", and when I then save the file in ps and convert in pdf the 'à' disappears or is substituted by something else. What I've tried doing is using variations of the commands
set encoding iso_8859_1
set ylabel "velocit\340"
then I saved the plot using set term postscript color, set output "graf.ps", replot, and from the wsl terminal, using ps2pdf, I converted it into a pdf, but when I open the pdf, the letter 'à' doesn't appear anymore, even though it did show in graph previously generated by gnuplot. What should I do? In case, is there another way I can attach the original graph in my latex document?
Gnuplot provides several LaTeX-friendly terminal types. Postscript is not one of them. Postscript's character encodings are idiosyncratic at best. If your goal is to include gnuplot output in latex, then choose a terminal type that is designed for it. Some terminal types (e.g. cairolatex) work only with latex because they depend on latex to do all the text processing. Others (e.g. pdf, png, tikz) produce output that is fully compatible with latex but already has the text embedded in it. It is best to use UTF-8 encoding for everything, including your accented characters. For example:
set term pdf size 7cm,5cm
set output 'myfigure.pdf'
set encoding utf8
set ylabel "velocità"
set xlabel "tempo"
plot [0:10] x**2 title "velocità"
Then in your latex document, something like:
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
...
My TeX document.
\begin{figure}[h]
\includegraphics{myfigure}
\end{figure}
...
I am a relatively new IPython Notebook user and I am using IPython 3.2.1. So upfront, my apologies if I did not read some documentation carefully!
I am trying to typeset some LaTeX in my Notebook intended for a presentation. I tried to utilize MathJax capabilities better than what's (supposedly) available by default and so tried incorporating other extensions that come with MathJax explicitly. In particular, I tried getting my IPython Notebook to load AMScd.js, AMSsymbols.js and unicode.js through the following sequence of steps:
Obtain the .js files for these extensions from the latest MathJax (v2.5) source
Add them to my ~/.ipython/nbextensions
Modify custom.js in ~/.ipython/profile_<mine>/static/custom by appending IPython.load_extensions("AMScd"), etc.
Now, all these work fine, and I am able to typeset commutative diagrams nicely in my IPython notebook. So, while at all this, I decided to also include/load AMSmath.js that comes along with MathJax and this is problematic. (To me, this seems like a natural thing to do given that other extensions work well!) However, attempting to include AMSmath.js via IPython.load_extensions("AMSmath") causes LaTeX math in my Notebook to display [Math Processing Error] everywhere. Here's my minimal example and the output with and without including IPython.load_extensions("AMSmath").
Markup:
## A minimal working example
\\[
\Delta u = f \text{ on } \Omega
\\]
(I would totally like to include images here, alas, my not being an active participant in the community here leaves me with not even 10 reputation!)
So, what am I missing here? Why is this inclusion of AMSmath problematic? Any help would be appreciated! Thanks!
It should work without extra configuration. Have a look here.
Your example in a markdown cell should be
(If you want the equation inline you can use $...$)
Inline equation $\Delta u = f \text{ on } \Omega$
(Or if you want the equation centered in their own line you can use $$...$$)
$$\Delta u = f \text{ on } \Omega$$
The result of both snippets in the same markdown cell is rendered as:
How it is loaded?
IPython/Jupyter notebook preloads some MathJax extensions including the extension you want to load. This extension is not an IPYthon/Jupyter extension so it shouldn't work if you try to load this MathJax extension as an IPython/Jupyter extension. See here to know more about how to load other MathJax extensions.
I'm currently trying to save a stress vs. strain curve using Octave. On this plot, I want to include text showing the equation for calculating engineering stress and engineering strain. Both of these require greek letters (\sigma and \epsilon respectively) as well as subscripts for the formulae.
Currently, using print with -deps, -dpng, or any other device, it creates a file, however the greek letters appear as the words "sigma" and "epsilon", and wherever I have a subscript, such as 0, it just appears as "_0". This looks very unprofessional.
Since I'm generating some 25 graphs, I don't want to have to go through and do a screenshot for each one. Does octave support saving the generated figure as displayed? I intend to use the generated files in a LaTeX document later (preferably as png so I can email them separately too).
I've also tried changing the "graphics_toolkit" option between fltk and gnuplot however it doesn't seem to help.
Attached to this post is a screenshot of the desired results and the actual results.
I am currently "not allowed" to post images, so I'll link them:
http://i.imgur.com/Tjt5Ecn.png (screenshot, desired result) and http://i.imgur.com/SP3hekd.png (directly saved, actual result)
Does anyone know a good way to print a figure from Octave which includes greek characters and subscripts in the titles?
Since you plan to use your graph in a Latex document, generating the graphs with -depslatex and converting them to pdf is a good idea . (Results look slightly better than direct -dpdflatex).
With -depslatex, you can include Latex code in your figures that will be written to a separate tex file.
Note that you need to use double backslashes \\ to export a single backslash.
graphics_toolkit("gnuplot");
...
legend("$\\varepsilon$");
print(sprintf("graph%s_%d.eps", name, type), '-depslatex', '-S200,270', '-F:9');
system(sprintf("epstopdf graph%s_%d.eps", name, type));
On the Latex side, you then \input the tex file generated by Octave. On the plus side, since you need 25 graphs, you can automatize this process on both sides Octave and Latex.
\newcommand{\mygraph}[1]{%
\graphicspath{{./figures/}}
\resizebox{0.495\linewidth}{!}{\relscale{1.0}\small%
\input{./figures/#1.tex}
}%
}
\mygraph{graph1_1}
Here, a Latex command \mygraph is defined to scale and include a figure located in a subfolder.
(I am using Octave 4.0.0 with gnuplot 4.4 on Ubuntu 12)
My school has Matlab but I can't use it at home so I am trying to learn Octave. I am having trouble saving plots as png files so I can put them in a report.
I read you can use print("filename.png") to save the plots, but I am getting some kind of error I am assuming is due to using latex in my labels
I am using
xlabel('\omega')
Error message: gdImageStringFT: Could not find/open font while printing string w with font Symbol
The plot still saves, but any label with latex in it just doesn't print at all. I know I could just avoid formatting the text, but it just looks so much nicer with latex.
Anyone know what I can do? (ps I am not very advanced with linux just fyi)
So what happens here is that for the png format Octave needs to have the Symbols font at its disposal if you want to include, e.g., greek letters. This is because png is a bitmap format and the letters are rasterized and printed into the picture.
The correct way, or at least the way most people circumvent Octave's / Mathematica's / etc. poor labeling, is to output encapsulated postscript (.eps) with dummy labels. These labels are kept separate in the eps format and one can then use the psfrag package in LaTeX to replace the dummy labels for correct labels. This allows for much better control over the label and gives you access to all of LaTeX's formatting and formulas.
Here or here is a hands on tutorial how to do this with Octave and gnuplot.
I am starting off with Postscript, and would like to do something very simple: include a LaTeX symbol within my Postscript document. For example:
%!
/FontSize 12 def
newpath
0 0 moveto
("Hello \LaTeX") show % This is where I would like
% the rendering of \LaTeX
% with actual LaTeX font
showpage
Any ideas?
The \LaTeX logo is just normal letters moved slightly around via kerning. So if you're already hacking raw postscript commands, you should just copy the dimensions from the definition in latex.ltx and issue the same movement commands between the letters in postscript. Ditto to select the CM font, or whatever you would like.
If the aim is to mix together Postscript and Latex in one document, you can use Metapost. Hans Hagen's Metafun manual is the best introduction to Metapost I know of, although note that:
He assumes that you will be using Tex or Context and not Latex. If you want to use Latex macros in Metapost, you will need some additional boilerplate;
Metafun is a slight superset of regular Metapost; and
He more or less ignores the ability of Metapost to embed raw Postscript — the core of the Metapost language is an extension of Knuth's Metafont, and is quite unlike Postscript.
Cf. also Troy Henderson's Embedding fonts in MetaPost output, which explains how to embed Tex fonts in the Postscript files generated by Metapost.