第1个回答 2008-11-20
>> x=-1:0.01:1;
>> y=-1:0.02:1;
>> [xx,yy]=meshgrid(x,y);
>> zz=xx.^2+yy.^2;
>> contour(xx,yy,zz,20)
>> figure
%left,right,top,bottom为去掉的部分
>> left=-0.4;
>> right=0.6;
>> top=-0.1;
>> bottom=-0.5;
>> zz(find((xx>left).*(xx<right).*(yy>bottom).*(yy<top)))=NaN;
>> contour(xx,yy,zz,20)本回答被提问者采纳