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66 lines
2 KiB
TeX
66 lines
2 KiB
TeX
\documentclass{standalone}
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\usepackage{pgfplots}
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\usepackage{sansmath} % for sans serif math
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%%%<
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% The data files, written on the first run.
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\begin{filecontents}{function.data}
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# x y
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0 0
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0 1
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1 0
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0 2
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1 1
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2 0
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0 3
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1 2
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2 1
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3 0
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0 4
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1 3
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2 2
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3 1
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4 0
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\end{filecontents}
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\begin{document}
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\begin{tikzpicture}
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\begin{axis}[
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compat=newest, % for better label placement
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font=\sansmath\sffamily, % math and normal text in sans serif
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xlabel=$y$, ylabel=$x$, % the label texts
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ylabel style={rotate=-90},
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xmin=0, ymin=0, % axis origin
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enlarge y limits=false, % don't enlarge the y axis beyond the data range
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enlarge x limits={upper,abs=0}, % enlarge x axis slightly to make sure the last tick mark is drawn completely
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xticklabel style={yshift=-1ex},
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yticklabel style={xshift=-1ex},
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axis lines*=left, % only draw the left axis lines, not a box
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unit vector ratio*={1 1 1}, % equal axis scaling. "*" to make sure the axes can only be reduced in size, not enlarged
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width=6cm, % set the overall width of the plot
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try min ticks=5, % adjusts how many ticks are printed
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tick align=center, % tick marks centered on the axes
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legend style={
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draw=none, % no frame around axes
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at={(1,1)}, % place at upper right of plot
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anchor=north, % use upper middle edge of legend for alignment
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fill=none
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},
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]
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\addplot [
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mark=square*, mark size=0.5em, % square, filled ("*"), radius of 0.5em
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nodes near coords={
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\pgfmathparse{int(\coordindex)}
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\pgfmathresult
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}, % print labels on each data point, using `\coordindex` (the data point counter) increased by 1
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every node near coord/.style={
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font=\scriptsize\sffamily\bfseries, % smaller text size, bold for the data point labels
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text=white,
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anchor=center % center the labels on the plot marks
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}
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] table {function.data};
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\addlegendentry{$\displaystyle\pi(x, y) = y + \sum_{i=0}^{x+y} i$}
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\end{axis}
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\end{tikzpicture}
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\end{document}
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