Description

The code above is a LaTeX document that generates a standalone TikZ picture. The TikZ package is used to draw a plot with axes representing the real part of a complex number ($\sigma$) and the imaginary part of a complex number ($j\omega_d$) in the complex plane.

The code draws the axes and marks the origin with a cross-out circle. It also draws dashed lines representing the angle $\theta=120^o$ from the positive $\sigma$ axis, and another dashed line representing the angle $\theta=30^o$ from the positive $j\omega\_d$ axis. The code also marks several points on the plot, including a point at (0,0), a point at $(j^2\sqrt{3},0)$, a point at $(-2,0)$, and a point at -4,0).

Overall, the code is generating a visual representation of a complex number system and illustrating the locations of certain points and angles within that system.

Keywords

tikz, shapes.misc, draw, node, dashed, solid, cross out, fill, black, -latex, -stealth.

Source Code

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.misc}
\begin{document}
\begin{tikzpicture}
% Axes:
\draw [-latex] (-5,0) -- (2.5,0) node [above left]  {$\sigma$};
\draw [-latex] (0,-1) -- (0,4) node [below right] {$j\omega_d$};
\node[cross out,draw=black] at (0,0) {};
 
\draw[dashed] (0,0) -- (125:3.5) node[solid, cross out,draw=black] {};
\draw[black, -stealth] (1.75,0) node[pos=0.1,above right] {$\theta=120^o$} arc (0:125:1.75);
 
\draw[dashed]  (-2,0) node[below left] {$-2$} -- (-2,2.867);
\draw[dashed]  (0,2.867) node[below left] {$j2\sqrt{(3)}$} -- (-2,2.867);
\draw[dashed]  (125:3.5) -- (-4,0) node[solid, cross out,draw=black] {};
\draw (-4,0) node [below left] {-4};
\draw[black, -stealth] (-2,2)  arc (0:-180:0.3);
\draw (-3,2.25)node[] {$\theta=30^o$};
\end{tikzpicture}
\end{document}