The goal is a syntactic parsing of scientific texts. And first I need to make part-of-speech tagging of sentences of such texts. Texts are from arxiv.org. So they are originally in LaTeX. When extracting text from LaTeX documents, math expressions can be converted into MathML (or maybe some other format, but I prefer MathML cause this work is being done to create a specific web-app, and MathML is a convenient tool for this).
The only idea I have is to substitute mathematical expressions with some phrases of natural language and then use some implemented algorithm for pos-tagging. So the question is how to implement this substitutions or, in general, how to implement pos-tagging of texts with mathematics in them?
I have implemented a formula substitution algorithm on top of the Stanford tagger and it works quite nice. The way to go is, as abecadel has written, to replace every formula with a unique but new word, I used a combination of a word and a hash 'formula-duwkziah'.
Replacing all of the mathematical formulae with a single, unique word seem to be the way to go.
In my Master thesis i want to append a paper as an appendix to the thesis. I am writing in LateX in the "report" style. At the end of the thesis there are some code in Appendix A, and in Appendix B i want to add a paper, written in latex. How do i append the paper at the end, as a standalone paper, with its own bibliography etc?
And the cleaner option consists of using pdfpages. That way rebuilding your document doesn't require appending it again :). The other options aren't really necessary in your case I believe: they mainly concern selecting specific pages and changing the page layout to multiple pages per sheet.
Note very clean, but you could just compile the two files as PDF and the concatenate the them.
I'm using the MLA authoring style. I would like to print out a bibliography subdivided into different sections. I also want annotations on each source. Is this possible with BibLaTeX? Should I just do it manually?
Yes, I think you can do that with Biblatex, but I think you should still just do it manually.
Note, though, that you are probably wanting to craft your notes differently for each citation from one paper to the next, which leads to the question: why use Bibtex at all? You can generate a Bibtex file the usual way, until all the references are there, then cut&paste the .bbl file into place in your Latex file, and annotate and reformat away to your heart's content.
So I think that Bibtex makes sense as a standard repository of the basic facts about citations you might make again and again: in particular you can get it error-free; my experience as a scientific editor is that most authors are sure that their bibliographies are error-free, most have between 10% and 60% of entries having errors in them. Latex users tend to be better that Word users in this respect, and I think that it is because of Bibtex.
Caveat: you will need to mess about with the thebibliography environment to do this. But that is another question... Also, if there are errors in your Bibtex file, you will need to correct them in two places.
Why I don't like Biblatex: the Bibtex prepresentation is a standard, and is accepted by all kinds of other document processors. You shouldn't put special Latex formatting into your bibliographic database: that will reduce the utility of that database. For m in particular, I use both Latex and Context: both use Bibtex, but only Latex uses Biblatex.
I managed to write a quite nice MLA-style bibliography with bibtex and the style provided by the Reed College (which is based on Natbib), and BibUnits to subdivide the entries in sections (as discussed here)
(let me know if you have any tips with MLA styles, my paper is not finished yet)
EDIT: my answer was for standard bibtex, not biblatex, sorry
yes, you can do it easily with biblatexwith the headings:
For instance:
\defbibheading{general}{\section*{General Architecture}}
\defbibheading{european}{\section*{European Architecture}}
\printbibliography[heading=general,keyword=general]
\printbibliography[heading=european,keyword=european]
and add the relevant keywords={architecture} keywords={general} in your *.bib files
Here is a biblatex MLA-style, if you need biblatex-mla (and a related question, you may also face this problem)
When I write math in LaTeX I often need to perform simple arithmetic on numbers in my LaTeX source, like 515.1544 + 454 = ???.
I usually copy-paste the LaTeX code into Google to get the result, but I still have to manually change the syntax, e.g.
\frac{154,7}{25} - (289 - \frac{1337}{42})
must be changed to
154,7/25 - (289 - 1337/42)
It seems trivial to write a program to do this for the most commonly used operations.
Is there a calculator which understand this syntax?
EDIT:
I know that doing this perfectly is impossible (because of the halting problem). Doing it for the simple cases I need is trivial. \frac, \cdot, \sqrt and a few other tags would do the trick. The program could just return an error for cases it does not understand.
WolframAlpha can take input in TeX form.
http://blog.wolframalpha.com/2010/09/30/talk-to-wolframalpha-in-tex/
The LaTeXCalc project is designed to do just that. It will read a TeX file and do the computations. For more information check out the home page at http://latexcalc.sourceforge.net/
The calc package allows you to do some calculations in source, but only within commands like \setcounter and \addtolength. As far as I can tell, this is not what you want.
If you already use sage, then the sagetex package is pretty awesome (if not, it's overkill). It allows you get nicely formatted output from input like this:
The square of
$\begin{pmatrix}
1 & 2 \\
3 & 4
\end{pmatrix}$
is \sage{matrix([[1, 2], [3,4]])^2}.
The prime factorization of the current page number is \sage{factor(\thepage)}
As Andy says, the answer is yes there is a calculator that can understand most latex formulas: Emacs.
Try the following steps (assuming vanilla emacs):
Open emacs
Open your .tex file (or activate latex-mode)
position the point somewhere between the two $$ or e.g. inside the begin/end environment of the formula (or even matrix).
use calc embedded mode for maximum awesomeness
So with point in the formula you gave above:
$\frac{154,7}{25} - (289 - \frac{1337}{42})$
press C-x * d to duplicate the formula in the line below and enter calc-embedded mode which should already have activated a latex variant of calc for you. Your buffer now looks like this:
$\frac{154,7}{25} - (289 - \frac{1337}{42})$
$\frac{-37651}{150}$`
Note that the fraction as already been transformed as far as possible. Doing the same again (C-x * d) and pressing c f to convert the fractional into a floating point number yields the following buffer:
$\frac{154,7}{25} - (289 - \frac{1337}{42})$
$\frac{-37651}{150}$
$-251.006666667$
I used C-x * d to duplicate the formula and then enter embedded mode in order to have the intermediate values, however there is also C-x * e which avoids the duplication and simply enters embedded mode for the current formula.
If you are interested you should really have a look at the info page for Emacs Calc - Embedded Mode. And in general the help for the Gnu Emaca Calculator together with the awesome interactive tutorial.
You can run an R function called Sweave on a (mostly TeX with some R) file that can replace R expressions with their results in Tex.
A tutorial can be found here: http://www.scribd.com/doc/6451985/Learning-to-Sweave-in-APA-Style
My calculator can do that. To get the formatted output, double-click the result formula and press ctrl+c to copy it.
It can do fairly advanced stuff too (differentiation, easy integrals (and not that easy ones)...).
https://calculator-algebra.org/
A sample computation:
https://calculator-algebra.org:8166/#%7B%22currentPage%22%3A%22calculator%22%2C%22calculatorInput%22%3A%22%5C%5Cfrac%7B1%2B2%7D%7B3%7D%3B%20d%2Fdx(arctan%20(2x%2B3))%22%2C%22monitoring%22%3A%22true%22%7D
There is a way to do what you want just not quite how you describe.
You can use the fp package (\usepackage[options]{fp}) the floating point package will do anything you want; solving equations, adding dividing and many more. Unfortunately it will not read the LaTeX math you instead have to do something a little different, the documentation is very poor so I'll give an example here.
for instance if you want to do (2x3)/5 you would type:
\FPmul\p{2}{3} % \p is the assignment of the operation 2x3
\FPupn\p{\p{} 7 round} % upn evaluates the assignment \p and rounds to 7dp
\FPdiv\q{\p}{5} % divides the assigned value p by 5 names result q
\FPupn\q{\q{} 4 round} % rounds the result to 4 decimal places and evaluates
$\frac{2\times3}{5}=\FPprint\q$ % This will print the result of the calculations in the math.
the FP commands are always ibvisible, only FPprint prints the result associated with it so your documents will not be messy, FP commands can be placed wherever you wish (not verb) as long as they are before the associated FPprint.
You could just paste it into symbolab which as a bonus has free step by step solutions. Also since symbolab uses mathquill it instantly formats your latex.
Considering that LaTeX itself is a Turing-complete markup language I strongly doubt you can build something like this that isn't built directly into LaTeX. Furthermore, LaTeX math matkup itself has next to no semantic meaning, it merely describes the visual appearance.
That being said, you can probably hack together something which recognizes a non-programmable subset of LaTeX math markup and spits out the result in the same way. If all you're interested in is simple arithmetics with fractions and integers (careful with decimal fractions, though, as they may appear as 3{,}141... in German texts :)) this shouldn't be too hard. But once you start with integrals, matrices, etc. I fear that LaTeX lacks expressiveness to accurately describe your intentions. It is a document preparation system, after all and thus not very suitable as input for computer algebra systems.
Side note: You can switch to Word which has—in its current version—a math markup language which is sufficiently LaTeX-like (by now it even supports LaTeX markup) and yet still Google-friendly for simpler terms:
With the free Microsoft Math add-in you can even let Word calculate expressions in-place:
There is none, because it is generally not possible.
LaTeX math mode markup is presentational markup and there are cases in which it does not provide enough information to calculate the expression.
That was one of the reasons MathML content markup was created and also why MathML is used in Mathematica. MathML actually is sort of two languages in one:
presentation markup
content markup
To accomplish what you are after you'll have to have MathML with comibned presentation and content markup (see MathML spec).
In my opinion your best bet is to use MathML (even if it is verbose) and convert to LaTeX when necessary. That said, I also like LaTeX syntax best and maybe what we need is a compact syntax for MathML (something similar in spirit to RelaxNG compact syntax).
For calculations with LaTeX you can use a CalcTeX package.
This package understand elements of LaTeX language and makes an calculations, for example your problem is avialble on
http://sg.bzip.pl/CalcTeX/examples/frac.tgz
or just please write
\noindent
For calculation please use following enviromentals
$515.1544 + 454$
or
\[ \frac{154.7}{25}-(289-\frac{1337}{42.})
\]
or
\begin{equation}
154.7/25-(289-1337/42.)
\end{equation}
For more info please visite project web site or contact author of this project.
For performing the math within your LaTeX itself, you might also look into the pgfmath package, which is more powerful and convenient than the calc package. You can find out how to use it from Part VI of The TikZ and PGF Packages Manual, which you can find here (version 2.10 currently): http://mirror.unl.edu/ctan/graphics/pgf/base/doc/generic/pgf/pgfmanual.pdf
Emacs calc-mode accepts latex-input. I use it daily. Press "d", followed by "L" to enter latex input mode. Press "'" to open a prompt where you can paste your tex.
Anyone saing it is not possible is wrong.
IIRC Mathematica can do it.
There is none, because it is generally not possible. LaTeX math mode
markup is presentational markup and there are cases in which it does
not provide enough information to calculate the expression.
You are right. LaTeX as it is does not provide enough info to make any calculations.Moreover, it does not represent any information to do it. But nobody prevents to wright in LaTeX format a text that contains such an information.
It is a difficult path, because you need to build a system of rules superimposed on what content ofthe text in Latex format needs to contain that it would be recognizable by your interpreter. And then convince the user that it is necessary to learn, etc. etc...
The easiest way to create a logical and intuitive calculator of mathematical expressions. And the expression is already possible to convert latex. It's almost like what you said. This is implemented in the program which I have pointed to. AnEasyCalc allows to type an expression as you type the plane text in any text editor. It checks, calculates and generate LateX string by its own then. Its very easy and rapid work. Just try and you will see that.
This is not exactly what you are asking for but it is a nice package
that you can include in a LaTeX document to do all kind of operations including arithmetic, calculus and even vectors and matrices:
The package name is "calculator"
http://mirror.unl.edu/ctan/macros/latex/contrib/calculator/calculator.pdf
The latex2sympy2 Python library can parse LaTeX math expressions.
from latex2sympy2 import latex2sympy
tex_str = r"""YOUR TEX MATH HERE"""
tex_str = r"\frac{9\pi}{\ln(12)}+22" # example TeX math
sympy_object = latex2sympy(tex_str)
evaluated_tex = float(sympy_object.evalf())
print(evaluated_tex)
This Python 3 code evaluates 9𝜋/ln(12)+22 (in its LaTeX from above) to 33.37842899841745.
The snippet above only handles basic algebraic simplification (math expressions without variables). Since the library converts LaTeX math to SymPy objects, the above code can easily be tweaked and extended to handle much more complicated LaTeX math (including solving derivatives, integrals, etc...).
The latex2sympy2 library can be installed via the pip command: pip install --user latex2sympy2
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try the AnEasyCalc program. It allows to get the latex formula very easy:
http://steamandwater.od.ua/AnEasyCalc/
:)
I am using LaTeX and in some cases have multiline footnotes.
When I use a two-column format and especially when the reference to a footnote is low in the column, LaTeX will often split the footnote in half: it starts in the original column, but then continues under another column (sometimes in another page), which is very distracting.
Is there a way to force LaTeX to never split footnotes and allocate enough space for them?
Use \interfootnotelinepenalty=10000 to totally disallow this. But be prepared for other layout artifacts... Setting the penalty lower than 10000 will give TeX some flexibility in deciding when the side effects are too bad to bear.
For a detailed discussion see the TeX FAQ item Why does LaTeX split footnotes across pages?
I've found that it's best to get the style sheet from where you're trying to publish, and just use their format (I'm assuming you're trying to publish somewhere, if you're using a double-column format). The editors can then handle wacky footnoting. If it's for a thesis, I don't know about your committee, but mine has told me that a single column, double-spaced is the way to go, which should avoid your problem in the first place.