Cfrgtkky

Hello I am new to this stackexchange, and I have a question in regards to how one plots a function. I have done research, and I have seen this question:

The Question

I have even tried programming it but it does not come up, and the function I would like to graph, and generally learn how to plot any function is the sqrt(9-x)^.5

Here is the bit of code which I have been working on:

usepackage{amsmath}

usepackage{amssymb}

usepackage{graphics}

usepackage{graphicx}

usepackage{pgfplots}

usepackage{subfigure}

usepackage{tikz}

usepackage{pgfplots}

usepackage{subfigure}



begin{figure}

centering  

subfigure

{  

    begin{tikzpicture}

    begin{axis}[xmin=-1.5,ymin=-1.5,ymax=1.5]

    addplot+[domain=0.0001:1.5,unbounded coords=jump,samples=301] {(9-x)^(0.5)};

    addlegendentry{$f(x)=sqrt{x}$}

    end{axis}

    end{tikzpicture}

}

%

end{figure}

Thank you very much.

Welcome to TeX.SE! This is an attempt to summarize some aspects of the comments by @daleif and myself.

1. You got an empty plot because you set ymax=1.5 but the function assumes larger values in the domain you are plotting it, so you effectively clip the plot away.


2. You are using the subfigure package. It is generally recommended to use the subcaption package instead.


3. Your code does not quite make an MWE. As pointed out by @daleif, it is lacking a documentclass as well as begin{document} and end{document}. And you are loading packages multiple times, and pgfplots already loads tikz, which loads graphicx.

This qualifies as a MWE and takes into account the above points.

documentclass{article}

usepackage{pgfplots}

pgfplotsset{compat=1.16}

usepackage{subcaption} 

begin{document}

begin{figure}[htb]

centering  

  begin{subfigure}{0.5textwidth}

    centering 

    begin{tikzpicture}

    begin{axis}[xmin=-0.1,xmax=1.6,ymin=1.5,ymax=3.5,

    xlabel={$x$},ylabel={$f(x)$}]

    addplot+[domain=0.0001:1.5,unbounded coords=jump,samples=301] {(9-x)^(0.5)};

    addlegendentry{$f(x)=sqrt{9-x}$}

    end{axis}

    end{tikzpicture}

    caption{Caption of a figure.}

    label{fig:ASubFigure}  

  end{subfigure}   

caption{Caption of a figure.}

label{fig:AFigure}  

end{figure}



Figure~ref{fig:ASubFigure} is a subfigure of figure~ref{fig:AFigure}.

end{document}