Finding an unknown vector from three known vectors

2021 1 4
1 个回答
回答已采纳
更新时间：2021 1 5
8 次查看（30 天）

0 个投票

Hi, I have some problem in writing the code. Let say I have vector A = [125 350 -80], B=[-115 350 -80], D=[-15 530 545] and I need to determine the positon of vector C. The lengths/magnitudes are given which are CA=300, CB=300, CD=650. How do I determine the value for C1 C2 C3?

请先登录，再回答此问题。

 采纳的回答

David Hill
David Hill 2021-1-4

0 个投票

syms x y z;
C=[x,y,z];
A = [125 350 -80];
B = [-115 350 -80];
D = [-15 530 545];
eq1=norm(A-C)==300;
eq2=norm(B-C)==300;
eq3=norm(D-C)==650;
eqns=[eq1,eq2,eq3];
c=vpasolve(eqns,[x,y,z]);

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Thanks for your help! I'm doing it wrong before this. Since vpasolve only give one solution I add initial values so that it will give me the answer that I want.
Right now I'm trying to make for loop as the value of CD is decreasing with increment -5 until 550. What I did below give me the same result for every looping. I can't seem to figure out where is the wrong part.
clear
close all
clc
syms x y z;
C=[x,y,z];
A = [125 350 -80];
B = [-115 350 -80];
D = [-15 530 545];
eq1=norm(A-C)==300;
eq2=norm(B-C)==300;
eq3=norm(D-C)==650;
eqns=[eq1,eq2,eq3];
for n=1:1
C=vpasolve(eqns,[x,y,z],[5;500;-90]);
end
for eq3=650:-10:550
ansx=['Cx',C.x];
disp (ansx)
ansy=['Cy',C.y];
disp (ansy)
ansz=['Cz',C.z];
disp (ansz)
end

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Stability Analysis 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by