请教：我把一个曲线旋转后，怎么Z轴有部分坐标成了虚数了呢，不知道为什么！
请教：我把一个曲线旋转后，再用一个圆去截了一下，怎么Z轴有部分坐标成了虚数了呢，不知道为什么！这是我复制的部份数据，只在xia.xls中最后才有几个Z轴的数为虚数：3.7405;0.16834;0.22081
3.7597;-0.16834;0.12211
3.7597;-0.056112;0.20025
3.7597;0.056112;0.20025
3.7597;0.16834;0.12211
3.7789;-0.056112;0.12658
3.7789;0.056112;0.12658
3.7981;-0.056112;0.040388
3.7981;0.056112;0.040388
3.8173;-28;0-28i
3.8173;-27.888;0-27.888i
3.8173;-27.776;0-27.776i
3.8173;-27.663;0-27.663i
3.8173;-27.551;0-27.551i
3.8173;-27.439;0-27.439i
3.8173;-27.327;0-27.327i
3.8173;-27.214;0-27.214i
3.8173;-27.102;0-27.102i
3.8173;-26.99;0-26.99i
3.8173;-26.878;0-26.878i
3.8173;-26.766;0-26.766i
3.8173;-26.653;0-26.653i
3.8173;-26.541;0-26.541i
3.8173;-26.429;0-26.429i
3.8173;-26.317;0-26.317i
3.8173;-26.204;0-26.204i
代码如下：c1=input('请输入A区大半径532/c1时的较小的c1值，赋值到c1:');
if (c1<1)|(c1>6),break;end
c2=input('请输入C区小半径532/c2时的较大的c2值，赋值到c2:');
if (c2<1)|(c2>6),break;end
m=input('请输入最下面C区圆弧口径，范围是25到35，赋值到m:');
if (m<25)|(m>35),break;end
n=input('请输入B区过渡区域口径，范围是10到16，赋值到n:');
if (n<10)|(n>16),break;end
a=523./c1;
b=523./c2;
d=b-sqrt(b.^2-(-m).^2);
x1=linspace(0,d,200);
y1=linspace(-m,m,500);
=meshgrid(x1,y1);
z11=sqrt((m-sqrt(2.*b.*x11-x11.^2)).^2-y11.^2);
ii=find((z11-50).^2+y11.^2>2500);
z11(ii)=[];
y11(ii)=[];
x11(ii)=[];
xyz1=);reshape(y11,1,[]);reshape(z11,1,[])]';
dlmwrite('xia.xls',xyz1,';');
e=(b.*(n.^2)-sqrt((b.^2).*(n.^4)-(n.^2).*(b.^2-(a.*(b.^2)).^(2/3)+n.^2).*(n.^2)))./(b.^2-(a.*(b.^2)).^(2/3)+n.^2);
x3=linspace(0,e,300);
y3=linspace(-(m+n),m+n,600);
=meshgrid(x3,y3);
z33=sqrt((sqrt(2.*b.*x33+(-b.^2+(a.*(b.^2)).^(2/3)-n.^2).*(x33.^2)./(n.^2))+m).^2-y33.^2);
jj=find((z33-50).^2+y33.^2>2500);
z33(jj)=[];
y33(jj)=[];
x33(jj)=[];
xyz3=);reshape(y33,1,[]);reshape(z33,1,[])]';
dlmwrite('zhong.xls',xyz3,';');
f=(b.*((a.*sqrt((a.*(b.^2)).^(2/3)-n.^2))./((a.*(b.^2)).^(1/3))+(b.*(n.^2))./(b.^2-(a.*(b.^2)).^(2/3)+n.^2)-((n.^2).*sqrt((a.*(b.^2)).^(2/3)-n.^2))./(b.^2-(a.*(b.^2)).^(2/3)+n.^2))-sqrt((a.*b).^2-(b.*(100-m)).^2+2.*n.*(100-m).*(b.^2)-2.*(a.*(b.^2)).^(2/3).*n.*(100-m)-(b.*n).^2-a.*(a.*(b.^2)).^(1/3).*(n.^2)+2.*(a.*(b.^2)).^(2/3).*(n.^2)))./b;
x5=linspace(e,f,500);
y5=linspace(-100,100,1000);
=meshgrid(x5,y5);
z55=sqrt(((a.^2-x55.^2+2.*(a.*sqrt((a.*(b.^2)).^(2/3)-n.^2)./(a.*(b.^2)).^(1/3)+b.*(n.^2)./(b.^2-(a.*(b.^2)).^(2/3)+n.^2)-n.^2.*sqrt((a.*(b.^2)).^(2/3)-n.^2)./(b.^2-(a.*(b.^2)).^(2/3)+n.^2)).*x55-(a.*sqrt((a.*(b.^2)).^(2/3)-n.^2)./(a.*(b.^2)).^(1/3)+b.*(n.^2)./(b.^2-(a.*(b.^2)).^(2/3)+n.^2)-n.^2.*sqrt((a.*(b.^2)).^(2/3)-n.^2)./(b.^2-(a.*(b.^2)).^(2/3)+n.^2)).^2).^(1/2)+n-a.*n/(a.*(b.^2)).^(1/3)+m).^2-y55.^2);
ll=find((z55-50).^2+y55.^2>2500);
z55(ll)=[];
y55(ll)=[];
x55(ll)=[];
xyz5=);reshape(y55,1,[]);reshape(z55,1,[])]';
dlmwrite('shang.xls',xyz5,';');
pianjiao=atan((f-d)./100); z11=sqrt((m-sqrt(2.*b.*x11-x11.^2)).^2-y11.^2);
这里开根号了
回复 沙发 sigma665 的帖子
哦，谢谢你呀，小西，对了，那为什么我另外两个数据里面没有虚数了呀！回复 沙发 sigma665 的帖子
谢谢你，开根号的时候被开方数为负数时就出来是虚数了吧！明白了，谢谢！[ 本帖最后由 fanzhenjie 于 2008-9-4 10:02 编辑 ] 原帖由 fanzhenjie 于 2008-9-4 09:52 发表 http://www.chinavib.com/forum/images/common/back.gif
哦，谢谢你呀，小西，对了，那为什么我另外两个数据里面没有虚数了呀！
那可能和你这组数据有关吧，揣测的哈。
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