2、<7r上的图形,采用选项PlotPoints->60.输入:Plot3D[Exp[-(xA2+yA2)/8]*(Cos[x]A2+Sin[y]A2),{x,0,Pi},{y,0,Pi},PlotPoints^60]输出:0.53.JC+y~在点(0,0)处不连续,作出该函数的图形,并J4观察曲面在(0,0)附近的变化情况。输入:-0.50.25-0.25Plot3D[x*y/(xA2+yA2),{x,・3,・1/100000},{y,-3,3}]输出:??94-作出椭球畔焙+「】的图形。输入:ParametricPlot3D
3、[{2Sin[u]*Cos[v],Sin[u]Sin[v],Cos[u]},{ur3,3},{v,・3,3}]输出:5.一个环面的参数方程如下,作出它的图形。x=(3+cosw)cosv,j=(3+cosw)sinv,z=sinw(0
4、z=v/3(-l{1,1,1},PlotPoints->30.输入:Plot3D[xA2-yA2/4,{x,-6,6},{y,-14,14},BoxRatios^{1,1,1},PlotPoints^30]输出:&作出圆柱面F+),=1和圆柱面x2+z2=l相交的图形。输入:g
5、1=ParametricPlot3D[{Cos[u],Sin[u],v},{u,-Pi,Pi},{v,-3,3},DisplayFunction—>Identity];g2=ParametricPlot3D[{Cos[u],v,Sin[u]},{u,-Pi,Pi},{v,-3,3},DisplayFunction—^Identity];Showfgl,g2,DisplayFunction^$DisplayFunction]输出:9.用ParametricPlot3D命令做岀抛物柱面无=于和平面x+z=l相交的图形。输入:g1
6、=ParametricPlot3D[{(1-Cos[2u])/2,Sin[u],v},{u,-Pi,Pi},{v,・3,3},DisplayFunction—^Identity];g2=ParametricPlot3D[{Cos[u]A2,v,Sin[u]A2},{u,-Pi,Pi},{v,・3,3},DisplayFunction^Identity];Show[g1,g2,DisplayFunction^$DisplayFunctionJ输出:10.自选区域作出z=xy的图形,并且通过不同视角的观察说明它是我们熟悉的哪种二
7、次曲面。输入:Plot3D[x*y,{x,-l,l},{y,-l,l}]11•做锥面x2+y2=z2和柱面(x-l)2+y2=l相交的图形。输入:g1=ParametricPlot3D[{Sin[u]*Cos[v],Sin[u]*Sin[v],Sin[u]},{u,-Pi,Pi},{v,・4,4},DisplayFunction^Identity];g2=ParametricPlot3D[{1+Cos[u],Sin[u],v},{u,・Pi,Pi},{v,・2,2},DisplayFunction^Identity];Sho
8、wfg1,g2,DisplayFunction^$DisplayFunction]MA实TIMC1用用扌屋3用用纟%567890A实蚀删匝跚掌臓艇遛潮刪懈蒯®幽飙飙JW»MA实卿昕掌HEIM3・用纟宏3・用用纟気567890MA实TA»»IWW#HEIM3.用用绘31用用纟%567890实