我使用 PStricks 绘制图片，但曲线折叠了。帮帮我！

Question

我的代码：

\documentclass[12pt,a4paper]{article}
\usepackage{fourier}
\usepackage{amsmath,amssymb}
\usepackage{pstricks}
\usepackage{pst-func,pst-plot,pst-eucl,pstricks-add,pst-node,multido}
\usepackage{auto-pst-pdf}
\usepackage{graphicx}
\usepackage[margin=2.25cm]{geometry}

\def\coeff{0 -5 0 1}

\begin{document}

\begin{center}
\begin{pspicture*}(-5,-5)(5,5)
  \psgrid[subgriddiv=0,griddots=10]
  \psset{yunit=0.5}
  \psaxes[Dy=2.5]{->}(0,0)(-5,-10)(5,10)
  \psPolynomial[dotscale=2,linewidth=2pt,linecolor=red,markZeros,coeff=0 -5 0 1]{-5}{5}
\end{pspicture*}
 \end{center}

\end{document}

Answer 1

设置plotpoints为更大的值：

\psPolynomial[dotscale=2,linewidth=2pt,linecolor=red,
  plotpoints=1000,markZeros,coeff=0 -5 0 1]{-5}{5}