答案1
\documentclass[10pt,a4paper]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.3}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
%hide axis,
xlabel=$x$,ylabel=$y$,
mesh/interior colormap name=hot,
colormap/blackwhite,
]
\addplot3[domain=-3:3,surf,samples=41]
{x*y*sin(deg(x^2+y^2))};
\end{axis}
\end{tikzpicture}
\end{document}