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47 lines
1.3 KiB
TeX
47 lines
1.3 KiB
TeX
\documentclass{article}
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\usepackage[pdftex,active,tightpage]{preview}
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\setlength\PreviewBorder{2mm}
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\usepackage{pgfplots}
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\usepgfplotslibrary{patchplots}
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\begin{document}
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\begin{preview}
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\pgfplotsset{
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colormap={whitered}{
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color(0cm)=(white);
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color(1cm)=(orange!75!red)
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}
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}
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\begin{tikzpicture}
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\begin{axis}[
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colormap name=whitered,
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width=15cm,
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view={45}{45},
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enlargelimits=false,
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grid=major,
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domain=-90:90,
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y domain=-90:90,
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% ymode=log,
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samples=46, %57 : TeX capacity exceeded, sorry [main memory size=3000000].
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% see also http://tex.stackexchange.com/a/7954/5645
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% zlabel=f,
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%colorbar,
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%colorbar style={
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% at={(-0.1,0)},
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% anchor=south west,
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% height=0.25*\pgfkeysvalueof{/pgfplots/parent axis height},
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% title={$f(x,y)$}
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%}
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]
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%\addplot3[patch,patch type=bilinear,mesh,black] {0};
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\addplot3[blue,/pgfplots/quiver,
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quiver/u=4 * sin(x) * cos(x) * (cos(x)^2 + cos(y)^2),
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quiver/v=4 * sin(y) * cos(y) * (cos(x)^2 + cos(y)^2),
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quiver/w=0,
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quiver/scale arrows=4,
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-stealth,samples=15] {-4};
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\addplot3[surf,opacity=0.9] {-(cos(x)^2 + cos(y)^2)^2};
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\end{axis}
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\end{tikzpicture}
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\end{preview}
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\end{document}
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