matlab画二元函数图像z = (x/(x+y) + 1.96*1.96/(2*(x+y)) - 1.96 * ((x/(x+y)*(1-x/(x+y))+1.96*1.96/(4*(x+y)))/(x+y))^0.5)/(1+1.96*1.96/(x+y))该怎么画
问题描述：
matlab画二元函数图像
z = (x/(x+y) + 1.96*1.96/(2*(x+y)) - 1.96 * ((x/(x+y)*(1-x/(x+y))+1.96*1.96/(4*(x+y)))/(x+y))^0.5)/(1+1.96*1.96/(x+y))该怎么画
答
xx=0:0.02:10;yy=xx;[x y]=meshgrid(xx,yy);
z=(x./(x+y) +1.96*1.96./(2*(x+y))-1.96*((x./(x+y).*(1-x./(x+y))+1.96*1.96./(4*(x+y)))./(x+y)).^0.5)./(1+1.96*1.96./(x+y));
surf(x,y,z)
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