[求助]请教高手，这个函数能画出三维图形吗？

efei

P := 15877506.71*((0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*(1+x)*(1.01-0.1880000000e-2*(-0.8116071429e16*x+0.5410714286e14*x*t2-0.1211208482e16-0.9064285715e12*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(-t2+150)*(-15.*pi*(-150.*x+x*t2-150.+t2)*(0.4046978854e25*x*t2+0.8030752639e27*x+0.8823875359e27+0.6603497957e24*t2+0.3700446764e23*x^2*t2+0.3008493306e21*x^2*t2^2-0.1231978009e26*x^2+0.3008493306e21*x*t2^2))^(1/2)*Ln(130/(t2-45))/((-150.*x+x*t2-150.+t2)*(-0.5625000000e23*pi*x+0.3750000000e21*pi*x*t2-0.5625000000e23*pi+0.3750000000e21*pi*t2)*((0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*(1+x)*(1-0.5000000000e-3*(-0.8116071429e16*x+0.5410714286e14*x*t2-0.1211208482e16-0.9064285715e12*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)-0.1250000000e-1*(0.2164285714e13*t2-0.3785297679e15-0.3246428572e15*x+0.2164285714e13*x*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(-0.5625000000e23*pi*x+0.3750000000e21*pi*x*t2-0.5625000000e23*pi+0.3750000000e21*pi*t2)^2/((-150.*x+x*t2-150.+t2)^2*pi*(0.4046978854e25*x*t2+0.8030752639e27*x+0.8823875359e27+0.6603497957e24*t2+0.3700446764e23*x^2*t2+0.3008493306e21*x^2*t2^2-0.1231978009e26*x^2+0.3008493306e21*x*t2^2)))^.16*(175-t2)))^.66-0.8675404752e-6*(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)/(-150.*x+x*t2-150.+t2)-0.6385291941e-8*(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*x*(1.01-0.4700000000e-1*(0.2164285714e13*t2-0.3785297679e15-0.3246428572e15*x+0.2164285714e13*x*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(-t2+150)/(-150.*x+x*t2-150.+t2)-0.3071328592e-3*(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*(1+x)*(1.01-0.1880000000e-2*(-0.8116071429e16*x+0.5410714286e14*x*t2-0.1211208482e16-0.9064285715e12*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(-t2+150)*Ln(130/(t2-45))*(55+1/2*t2)/((-150.*x+x*t2-150.+t2)*((0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*(1+x)*(1-0.5000000000e-3*(-0.8116071429e16*x+0.5410714286e14*x*t2-0.1211208482e16-0.9064285715e12*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)-0.1250000000e-1*(0.2164285714e13*t2-0.3785297679e15-0.3246428572e15*x+0.2164285714e13*x*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(-0.5625000000e23*pi*x+0.3750000000e21*pi*x*t2-0.5625000000e23*pi+0.3750000000e21*pi*t2)^2/((-150.*x+x*t2-150.+t2)^2*pi*(0.4046978854e25*x*t2+0.8030752639e27*x+0.8823875359e27+0.6603497957e24*t2+0.3700446764e23*x^2*t2+0.3008493306e21*x^2*t2^2-0.1231978009e26*x^2+0.3008493306e21*x*t2^2)))^.16*(175-t2))-0.6574658544e-10*(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2)*x*(.773-0.3110000000e-1*(0.2164285714e13*t2-0.3785297679e15-0.3246428572e15*x+0.2164285714e13*x*t2)/(0.1007142857e12*x*t2-0.1510714286e14*x+0.1345787202e15+0.1007142857e12*t2))*(273+t2)/(-150.*x+x*t2-150.+t2);

这个函数只有两个变量，我画图的时候老是出错，不知道怎么回事，请教高手看看！！！
谢谢


我在Maple 9和MATLAB 6.5.1下都画不出来

suffer

<P>说明一下你是怎么画图的？<BR><BR>向量计算用".*" "./" ".^"</P>

xuebx

程序最好能让人明确的看懂，呵呵，感觉有点乱

pheigenbau

楼主整这出有意义吗？

efei

<P><br>这是一个数学模型的例算结果，我也不想这么乱，但是算出来就这结果，而且，带入x和t2的值算出来的结果也还不错，需要在一定区间求最小值，我想能够画出图来就更好了，<br><br>在Maple 9中，用如下命令，没结果：<br>plot3d( P, x=0..1, t2=45..150, axes=BOXED,title=`3d Plot`);<br><br>对了，顺便问一下，在Maple 9中能直接用函数求的最小值吗？在MATLAB 6.5.1中老是提示函数有错误，但在Maple 9中这个函数能 正常运算！</P>

[此贴子已经被作者于2006-6-18 13:35:04编辑过]