一个弱弱的画图问题，大家帮帮忙啊~~
我想构建一个函数，结果运行如下：<BR>>>=meshgrid(0:1000:10000,0:0.1:1);z=5*x^(-0.05)*(x-3000+y*1500)-400*y^2-1000*y*5*x^(-0.05);<BR>Warning: Matrix is singular to working precision.<BR>(Type "warning off MATLAB:singularMatrix" to suppress this warning.)<BR>Warning: Matrix is singular to working precision.<BR>(Type "warning off MATLAB:singularMatrix" to suppress this warning.)<BR>>> surf(x,y,z);<BR><BR>但是最后给的图却是只有网格，没有函数，咋回事啊？<BR>大侠们帮帮忙阿~~ 上面的*与^都用.*跟.^试验下
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