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ld1106282791

新虫 (小有名气)

[求助] matlab求解方程组 已有1人参与

matlab求解方程组,具体方程组如下图,


syms x1 x2 x3 x y  y3 z2 z3 Alpha0 Beta0 Alpha Beta
>> b1=[x2-x1 0 0];
b2=[x3-x2 0 z3-z2];
b3=[x-x3 y-y3 -z3];
>> n1= [sin(Alpha+Alpha0) 0 cos(Alpha+Alpha0)];
n2= [0 cos(Beta+Beta0) sin(Beta+Beta0)];
[x3,Alpha,Beta]=solve('b1*n1/norm(b1)=-b2*n1/norm(b2)','b2*n2/norm(b2)=-b3*n2/norm(b3)','dot(n2,cross(b2,b3))=0','x3','Alpha','Beta')


程序运行出错   求大神指教

matlab求解方程组
4.png
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ld1106282791

新虫 (小有名气)

引用回帖:
8楼: Originally posted by yanze at 2017-08-03 20:53:47
clc
clear



x3AlphaBeta=[];
si=0:pi/18:2*pi;
for i=1:length(si)
    sita=si(i);
    syms x3 Alpha Beta
x1=-2;
x2=0;
y3 = 0;
z2=200;
z3=200-0.1;
R=70;
x=R*cos(sita);
y=R*sin(sita ...

你好  请问为什么最后得到的x3AlphaBeta矩阵的行数比length(si)多1呢
9楼2017-08-03 21:25:37
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匿名

用户注销 (职业作家)

Matlab专家

★ ★
感谢参与,应助指数 +1
jjdg: 金币+2, 感谢参与 2017-08-03 19:12:03
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2楼2017-08-03 17:17:32
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Mr__Right

专家顾问 (著名写手)

★
jjdg: 金币+1, 感谢参与 2017-08-03 19:12:11
这类问题,一般情况下用软件无法求符号解。

但是,所有已知常数都给定的情况下,可以求数值解
文章乃身外之物,要多考虑编辑、审稿人和读者的感受。
3楼2017-08-03 17:18:44
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ld1106282791

新虫 (小有名气)

引用回帖:
2楼: Originally posted by yanze at 2017-08-03 17:17:32
Cannot find explicit solution.
syms x1 x2 x3 x y y3 z2 z3 Alpha0 Beta0 Alpha Beta
b1=;

b2=;

b3=;
n1= ;

n2= ;
aa=b1*n1/norm(b1)+b2*n1/norm(b2)
bb=b2*n2/norm(b2)+b3*n2/norm(b3)
cc=do ...

x1=-2;
x2=0;
y3 = 0; ;
z2=200;
z3=200-0.1;
R=70;
x=R*cos(sita);
y=R*sin(sita);
sita==0:pi/18:2*pi;
Alpha0=pi/4;
Beta0=pi/6;

求[x3,Alpha,Beta]的数值解    程序一直出错   求大神指教
4楼2017-08-03 19:06:19
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