Merge pull request #935 from julient31/spin_origin

option(ENABLE_ALL "Build all default packages" OFF)

set(DEFAULT_PACKAGES ASPHERE BODY CLASS2 COLLOID COMPRESS CORESHELL DIPOLE GRANULAR

  KSPACE MANYBODY MC MEAM MISC MOLECULE PERI QEQ

  REAX REPLICA RIGID SHOCK SNAP SRD)

  REAX REPLICA RIGID SHOCK SNAP SPIN SRD)

set(OTHER_PACKAGES KIM PYTHON MSCG MPIIO VORONOI POEMS LATTE

  USER-ATC USER-AWPMD USER-BOCS USER-CGDNA USER-MESO

  USER-CGSDK USER-COLVARS USER-DIFFRACTION USER-DPD USER-DRUDE USER-EFF

\documentclass[preview]{standalone}

\usepackage{varwidth}

\usepackage[utf8x]{inputenc}

\usepackage{amsmath,amssymb,amsthm,bm,tikz}

\usetikzlibrary{automata,arrows,shapes,snakes}

\begin{document}

\begin{varwidth}{50in}

\begin{tikzpicture}

%Global

\node (v1) at (0,6.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] { $\bm{v} \leftarrow \bm{v}+L_v.\Delta t/2$ };

\node (s1) at (0,4.5) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] { $\bm{s} \leftarrow \bm{s}+L_s.\Delta t/2$ };

\node (r)  at (0,3.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] { $\bm{r} \leftarrow \bm{r}+L_r.\Delta t$ };

\node (s2) at (0,1.5) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] { $\bm{s} \leftarrow \bm{s}+L_s.\Delta t/2$ };

\node (v2) at (0,0.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] { $\bm{v} \leftarrow \bm{v}+L_v.\Delta t/2$ };

\draw[line width=2pt, ->] (v1) -- (s1);

\draw[line width=2pt, ->] (s1) -- (r);

\draw[line width=2pt, ->] (r) -- (s2);

\draw[line width=2pt, ->] (s2) -- (v2);

%Spin

\node (s01) at (6,6.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] {$\bm{s}_0 \leftarrow \bm{s}_0+L_{s_0}.\Delta t/4$ };

\node (sN1) at (6,4.5) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] {$\bm{s}_{\rm N-1}\leftarrow\bm{s}_{\rm N-1}+L_{s_{\rm N-1}}.\Delta t/4$};

\node (sN)  at (6,3.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] {$\bm{s}_{\rm N} \leftarrow \bm{s}_{\rm N}+L_{s_{\rm N}}.\Delta t/2$ };

\node (sN2) at (6,1.5) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] {$\bm{s}_{\rm N-1}\leftarrow\bm{s}_{\rm N-1}+L_{s_{\rm N-1}}.\Delta t/4$};

\node (s02) at (6,0.0) [draw,thick,minimum width=0.2cm,minimum height=0.2cm] {$\bm{s}_0 \leftarrow \bm{s}_0+L_{s_0}.\Delta t/4$ };

\draw[line width=2pt,dashed, ->] (s01) -- (sN1);

\draw[line width=2pt, ->] (sN1) -- (sN);

\draw[line width=2pt, ->] (sN) -- (sN2);

\draw[line width=2pt,dashed, ->] (sN2) -- (s02);

%from Global to Spin

\draw[line width=2pt, dashed, ->] (s1) -- (s01.west);

\draw[line width=2pt, dashed, ->] (s1) -- (s02.west);

\end{tikzpicture}

\end{varwidth}

\end{document}

\documentclass[preview]{standalone}

\usepackage{varwidth}

\usepackage[utf8x]{inputenc}

\usepackage{amsmath, amssymb, graphics, setspace}

\begin{document}

\begin{varwidth}{50in}

  \begin{equation}

    \frac{d \vec{s}_{i}}{dt} = \frac{1}{\left(1+\lambda^2 \right)} \left( \left(

    \vec{\omega}_{i} +\vec{\eta} \right) \times \vec{s}_{i} + \lambda\, \vec{s}_{i}

  \times\left( \vec{\omega}_{i} \times\vec{s}_{i} \right) \right), \nonumber

  \end{equation}

\end{varwidth}

\end{document}