I look here for a way to show a long division of polynomials, and I read here about polynom.sty, but my question is if there is a way that I can write the whole division and not just give two polynomials as input.
i.e. I'm looking for a way to write a long division of polynomials.
If you have any suggestions I'd like to read!!
P.S. I'm using LyX.
I know it`s not the nicest way to do this, but here we go...
(I tried some time ago to find a nicer way and failed. I give you my improvised result)
Just enter the polynomials into a regular table, and use separating lines for the top and side. In LyX it looks like this:
and after compilation it looks like this:
This might help you get started, if you don't mind doing the algebra yourself.
\documentclass{article}
\usepackage{mathtools}
\usepackage{xspace,xcolor}
\usepackage[display]{texpower}
\usepackage[screen,nopanel]{pdfscreen}
\margins{0.25in}{0.25in}{0.25in}{0.25in}
\screensize{4.5in}{6in}
\backgroundcolor{lightgray}
\newcommand{\ldsym}{$\left.\mathstrut\right)$}% unbalanced )
\newlength{\ldwidth}
\newcommand{\longdivide}[2]% #1 = denominator, #2 = numerator
{\settowidth{\ldwidth}{\ldsym}
$#1\,\raisebox{1.5pt}{\ldsym}\hspace*{-.65\ldwidth}\overline{
\mathstrut\hspace*{.35\ldwidth}\ #2}$}
\begin{document}
\stepwise{
\begin{center}
\begin{tabular}{r}
\bstep[\value{step}=1]{$7x$}\bstep[\value{step}=4]{$\strut+8$}\\
\longdivide{x^{2}-4x+1}{7x^{3}-20x^{2}-25x+8}\\
\bstep[\value{step}=2]{\underline{$7x^3-28x^2+7x$}}\hphantom{$\strut+8$}\\
\bstep[\value{step}=3]{$8x^2-32x+8$}\\
\bstep[\value{step}=5]{$8x^2-32x+8$}
\end{tabular}
\end{center}
}
\end{document}
As far as I can see, there is no way to use \cline in an array environment via the LyX GUI. Therefore, to use the GUI to create the table-like structure, one has to use a tabular: Insert --> Table. It is not an ideal solution, as each cell has to be placed in (inline) math mode. The code below is a .lyx file with an example, copy the code into a text editor and save the file as something.lyx.
Things to note:
@{}r, which creates a right aligned column with the column padding before the column removed. {}) before the plus signs is to ensure the right spacing. When writing $+4$, the plus is a unary relation, while with ${}+4$ it is a binary relation, which you want.) in row 1, column 2, as in Peter Grill's answer, to improve alignment.#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
\begin_document
\begin_header
\textclass article
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize default
\use_geometry false
\use_amsmath 1
\use_esint 1
\use_mhchem 1
\use_mathdots 1
\cite_engine basic
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header
\begin_body
\begin_layout Standard
\begin_inset Tabular
<lyxtabular version="3" rows="5" columns="4">
<features tabularvalignment="middle">
<column alignment="center" valignment="top" width="0pt" special="@{}r">
<column alignment="center" valignment="top" width="0pt" special="@{}r">
<column alignment="center" valignment="top" width="0pt" special="@{}r@{}">
<column alignment="center" valignment="top" width="0pt" special="l">
<row>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula $x^{2}$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}+4x\phantom{)}$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}+4$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}:x+2=x+2$
\end_inset
\end_layout
\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula $-(x^{2}$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}+2x)$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula $2x$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}+4$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula $2x$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula ${}+4$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\begin_inset Formula $0$
\end_inset
\end_layout
\end_inset
</cell>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text
\begin_layout Plain Layout
\end_layout
\end_inset
</cell>
</row>
</lyxtabular>
\end_inset
\end_layout
\end_body
\end_document
Use table and borders. In LyX:
PDF output:
(After looking around on the web for some time, this was the easiest and nicest solution I could find. It was based on DalyaG's answer.)
There is no simpler way?
– heblyx Jan 10 '14 at 08:40array, so you could of course create anarrayvia the LyX GUI, i.e. Insert --> Math --> Array environment. – Torbjørn T. Jan 10 '14 at 08:52Thank you!
– heblyx Jan 10 '14 at 09:55\clinein anarrayvia the GUI. You can achieve the same effect in a normaltabular, but I didn't immediately see a way witharray. Have to look at this later, don't really have time right now. – Torbjørn T. Jan 10 '14 at 10:21