2

Trying to recreate this graph: enter image description here

however mine turns out like this:

enter image description here

Issues that I am having:

  1. The curve doesn't look very smooth and even.
  2. Nothing I try to draw (\draw) appears in the figure, I'm trying to add the text inside the figure.

Code: 

\begin{tikzpicture}
    \begin{axis}[xlabel = {lowest to highest},
                ylabel = {income earned},
                xmin = 0,
                xmax = 1,
                ymin = 0,
                ymax = 1
    ]
        \addplot[smooth]{x};
        \addplot[smooth, thick, label=$x$]{x^2};
        \coordinate (P) at (0,0);
        \node[rotate=45] (N) at (P) {lorenz curve};
    \end{axis}
\end{tikzpicture}

The last part trying to draw the text node was just something I found here: TikZ diagonal text. What am I doing wrong?

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2

Something like this?

\documentclass[tikz,border=3.14mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[xlabel = {lowest to highest},
                ylabel = {income earned},
                xmin = 0,
                xmax = 1,
                ymin = 0,
                ymax = 1
    ]
        \addplot[domain=0:1]{x} node[midway,above,sloped]{Line of equality}
        node[midway,below,sloped]{Concentration area};
        \addplot[domain=0:1,smooth, thick, label=$x$]{x^2}
        node[midway,below,sloped]{Lorenz curve};
    \end{axis}
\end{tikzpicture}
\end{document}

enter image description here

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7
  • Amazing! Only thing is that the "concentration area" comes out at an awkward position for me, the y=x line goes through it, unlike your picture above. How would I move it? – Chisq Apr 17 '19 at 14:31
  • Use [below=1ex] or so to adjust the positioning. – John Kormylo Apr 17 '19 at 14:34
  • 1
    @Chisq Does that happen when you compile the above or when you embed it into another document (in which you e.g. did not say \pgfplotsset{compat=1.16})? – user121799 Apr 17 '19 at 14:36
  • 1
    @Chisq It is hard for me to debug this because the above does not have the issue, nor do I know what I can do to reproduce it. There are many conceivable reasons. How about \addplot[domain=0:1]{x} node[midway,above,sloped]{Line of equality}; \node[rotate=40] at (0.5,0.4 ){Concentration area};? – user121799 Apr 17 '19 at 14:49
  • 1
    @Chisq This is because pgfplots rescales both directions independently to produce a plot that has the preset width and height. You can turn this off by adding axis equal image to the options of the axis, in which case the x and y units will be the same (in this example). – user121799 Apr 17 '19 at 15:03

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