# Multiple Pointing arrows in a slide unable to find the location

I am new to tikz just able to draw some arrows but going to complex part unable to find the location and technique to do so.

\documentclass[xcolor=dvipsnames, aspectratio=169, 11pt]{beamer}
\usepackage[absolute,overlay]{textpos}
\begin{document}
\section{}
\begin{frame}
\frametitle{Matplotlib}
\framesubtitle{Input}
\scriptsize
\begin{columns}[T] % align columns
\begin{column}{0.5\textwidth}
\color{Black}
\begin{block}{Array}
\texttt{%
ax.tick\_params(which=major', width=1.0)\\
ax.tick\_params(which=major', length=10)\\
ax.tick\_params(which=minor', width=1.0, labelsize=10)\\
ax.tick\_params(which=minor', length=5, labelsize=10, labelcolor=0.25')\\
ax.grid(linestyle="--", linewidth=0.5, color=.25', zorder=-10)\\
ax.plot(X, Y1, c=(0.25, 0.25, 1.00), lw=2, label="Blue signal", zorder=10)\\
ax.plot(X, Y2, c=(1.00, 0.25, 0.25), lw=2, label="Red signal")\\
ax.plot(X, Y3, linewidth=0,marker=o', markerfacecolor=w', markeredgecolor=k')\\
ax.set\_title("Anatomy of a figure", fontsize=20, verticalalignment=bottom')\\
ax.set\_xlabel("X axis label")\\
ax.set\_ylabel("Y axis label")\\
ax.legend()\\   }\\
\end{block}

\end{column}%
\hfill%
\begin{column}{.5\textwidth}

\end{column}%
\end{columns}

\end{frame}
\end{document}


• Sorry but I don't understand the link between your code and the picture you provided below it. What do you exactly try to do, and what did you do yet? Jul 24 '21 at 11:50
• The code belongs to a slide where I want to point out few places and want to describe them as given in the picture using tikz. Jul 24 '21 at 12:19
• Now that you edited it, it's much clearer. Do you know about tikzmark library? This would be a nice way to achieve this. Jul 24 '21 at 12:28
• This answer uses an old version of tikzmark. Better lead to one using the actual library, I think. Jul 24 '21 at 12:43

\documentclass[xcolor=dvipsnames, aspectratio=169, 11pt]{beamer}
\usepackage[absolute,overlay]{textpos}
\usepackage{tikz} \usetikzlibrary{tikzmark,calc}

\begin{document}
\section{}
\begin{frame}
\frametitle{Matplotlib}
\framesubtitle{Input}
\scriptsize
\begin{columns}[T] % align columns
\begin{column}{0.5\textwidth}
\color{Black}
\begin{block}{Array}
\texttt{%
\tikzmarknode{o}{}ax.tick\_params(\tikzmarknode{A}{which='major'}, width=1.0)\\
ax.tick\_params(which='major', length=10)\\
ax.tick\_params(which='minor', width=1.0, labelsize=10)\\
ax.tick\_params(which='minor', \tikzmarknode{B}{length=5}, labelsize=10, labelcolor='0.25')\\
ax.grid(linestyle="--", linewidth=0.5, color='.25', zorder=-10)\\
ax.plot(X, Y1, c=(0.25, 0.25, 1.00), lw=2, label="Blue signal", zorder=10)\\
ax.plot(X, Y2, c=(1.00, 0.25, 0.25), lw=2, label="Red signal")\\
ax.plot(X, Y3, linewidth=0,\tikzmarknode{C}{marker='o'}, markerfacecolor='w', markeredgecolor=\tikzmarknode{D}{'k'})\\
ax.set\_title("Anatomy of a figure", fontsize=20, verticalalignment='bottom')\\
ax.set\_xlabel("X axis label")\\
ax.set\_ylabel("Y axis label")\\
ax.legend()\\   }
\end{block}
\end{column}%
\hfill%
\begin{column}{.5\textwidth}

\end{column}%
\end{columns}

\begin{tikzpicture}[remember picture,overlay,
myline/.style={red,opacity=0.5,very thick},
myblock/.style={draw,red,minimum height=1cm,minimum width=3cm}]
\path (o) --++ (10,0) coordinate (O);
\draw[->,myline] (A.south) to[out=-50,in=180,looseness=.5] (O) node[right,myblock] {First comment};
\draw[->,myline] (B.south) to[out=-50,in=180,looseness=.5] ($(O)+(0,-1.5)$) node[right,myblock] {Second comment};
\draw[->,myline] (C.north east) to[out=50,in=180,looseness=.5] ($(O)+(0,-3)$) node[right,myblock] {Third comment};
\draw[->,myline] (D.south) to[out=-50,in=180,looseness=.5] ($(O)+(0,-4.5)$) node[right,myblock] {Fourth comment};
\end{tikzpicture}
\end{frame}
\end{document}

• Still showing some errors Jul 25 '21 at 7:48
• I had to modify some minor things in your code to make it compilable, and the one I provided here compiles and produces the image above. It's working and answers the question. Now that you've got a starting point, feel free to adapt it and ask another question if you need improvement. Jul 25 '21 at 8:37
• Yes, Thank so much for the guidance and help Jul 25 '21 at 8:44
• Package pgf Error: No shape named o is known. \end{frame} ad similarly for A, B, C, D. I am unable to understand it. -@SebGlav Jul 25 '21 at 9:21
• Maybe your LaTeX distribution is too old and doesn't contain a proper version of tikzmark library. It compiles finely in Overleaf. Jul 25 '21 at 9:32