Created
September 3, 2017 01:20
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Dirac delta example in PGF/TikZ
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\documentclass[crop=true, border=10pt]{standalone} | |
\usepackage{amsmath} | |
\usepackage{graphicx} | |
\usepackage{xcolor} | |
\usepackage{tikz} | |
\usetikzlibrary{arrows.meta} | |
\usepackage{tikz-3dplot} | |
\usepackage{pgfplots} | |
\usepgfplotslibrary{fillbetween} | |
\definecolor{plum}{rgb}{0.36078, 0.20784, 0.4} | |
\definecolor{chameleon}{rgb}{0.30588, 0.60392, 0.023529} | |
\definecolor{cornflower}{rgb}{0.12549, 0.29020, 0.52941} | |
\definecolor{scarlet}{rgb}{0.8, 0, 0} | |
\definecolor{brick}{rgb}{0.64314, 0, 0} | |
\definecolor{sunrise}{rgb}{0.80784, 0.36078, 0} | |
\definecolor{lightblue}{rgb}{0.15,0.35,0.75} | |
\newcommand\nts{\negthickspace} | |
\pgfplotsset{width=9cm,compat=1.15} | |
\begin{document} | |
\begin{tikzpicture} | |
\begin{axis}[%xlabel=$x$, | |
ylabel=,grid=both,xtick=\empty,ytick=\empty, minor tick num=2, | |
extra x ticks={-1,-.5,0,.5,1,1.5,2,2.5,3}, | |
extra x tick style={grid=major}, | |
extra x tick labels={,,$a$,,$x_{0}$,,$b$,,}, | |
extra y ticks={0,.125,.25,.375,.5,.625,.75,.875,1}, | |
extra y tick style={grid=major,}, | |
extra y tick labels={,,,,,,,,$\infty$}, | |
] | |
\addplot [ | |
name path = A, | |
scarlet, ultra thick, | |
domain=-1:3, | |
samples=201, | |
] | |
{.5*exp(-.075*(x-3)^2)}; | |
% | |
\path [name path=B] | |
(0,0) -- (2,0); | |
% | |
\addplot [scarlet!10] fill between [ | |
of=A and B, | |
soft clip={ | |
(0,0) rectangle (2,4) | |
}, | |
]; | |
% | |
% Dirac Delta | |
\addplot [ | |
chameleon, thick, | |
domain=-1:3, | |
samples=201, | |
] | |
{exp(-1000*(x-1)^2)}; | |
% | |
\node [] at (1.7,.9) {$\delta(x-x_{0})$}; | |
\node [] at (.3,.4) {$f(x)$}; | |
\end{axis} | |
\end{tikzpicture} | |
% | |
\hskip1em | |
% | |
\begin{tikzpicture} | |
% Set the first node so bottom corners of both pictures are at the same height. | |
\node [] at (0,0) {}; | |
\node [] at (0,3.5) {$\displaystyle \int_{a}^{b} \nts dx\,f(x)\,\delta(x-x_{0}) = f(x_{0})$}; | |
\end{tikzpicture} | |
\end{document} |
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