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  1. 1. 第 10章用 MATLAB 画空间曲线 当空间曲线,曲面的形状较为复杂时,应借助 MATLAB 来绘制其图形。MATLAB 具有三 个基本的三维绘图命令:三维曲线绘图命令 plot3,三维曲面绘图命令 mesh 和 surf,这三个 命令在教材附录中都有介绍,下面给出 plot3 命令的使用例子。  x = cos t  例 10.5.1 试绘制空间曲线  y = sin t cos t z = t  解 执行下述命令: t=0:pi/30:6*pi;↙ x=cos(t); ↙ y=sin(t).*cos(t); ↙ z=t; ↙ plot3(x,y,z) ↙ 得到该空间曲线的形状如下图: