在mathematica中怎么用极坐标画图？ 如何根据极坐标作图
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http://tieba.baidu.com/p/2866191283
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PolarPlot[Evaluate[2*t/(1 + t^2) /.Solve[\[Theta] == Pi*t/(1 + t), t]], {\[Theta], 0, Pi}]
ParametricPlot[{2*t/(1 + t^2)*Cos[Pi*t/(1 + t)],
2*t/(1 + t^2)*Sin[Pi*t/(1 + t)]}, {t, 0, 100}, PlotRange -> All]
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使用PolarPlot函数即可在极坐标画图，比如：PolarPlot[Sin[3 t], {t, 0, Pi}]
PolarPlot[{1, 1 + 1/10 Sin[10 t]}, {t, 0, 2 Pi}]
PolarPlot[{1, 1 + 1/10 Sin[10 t]}, {t, 0, 2 Pi}, PlotStyle -> {Green, Directive[Dashed, Thick, Orange]}]
PolarPlot
比如画图
PolarPlot[theta^2,{theta,0,Pi}]
画出了r=theta^2的图像
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