清空筛选条件
清空筛选条件

Equations solving on Matlab , 3 unkowns and 2 equations.

4 次查看（过去 30 天）
Rana Önem
Rana Önem 2020-5-29
评论： Rana Önem 2020-5-29
v0=vf+ vfg*x;
u0=uf+ufg*x;
If we know vf,vfg,uf,ufg values how can I calculate x? Can you help me please?
Also there is this eq. m2*(he-u0)==m1*(he-u1); , we know he, m1,u1, values too.
In addition this eq. m2=v/vO; we know v value.
  2 个评论
Robin Kirsch
Robin Kirsch 2020-5-29
编辑：Robin Kirsch 2020-5-29
if you have the 2 formulas m2 *(he... and m2 = v/v0 , dont you have 3 unknowns and 3 equations then? see my answer below
or is v0 of the first equation different from the m2 = v/vO?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Robin Kirsch
Robin Kirsch 2020-5-29
If you simply want to know x, v0 and u0 you can just use the solve method. I assumed random variables for the known constants in my example.
syms x v0 u0
vf = 3;
vfg = 5;
uf = 2;
ufg = 1;
v = 7;
he = 2.5;
m1 = 4;
u1 = 1.1;;
eqn1 = v0 == vf+ vfg*x;
eqn2 = u0 == uf+ufg*x;
eqn3 = v/v0 * (he - u0) == m1*(he-u1);
[x v0 u0] = solve([eqn1, eqn2, eqn3], [x, v0, u0])
  3 个评论
显示 1更早的评论
Brent Kostich
Brent Kostich 2020-5-29
If you use 'syms' you get symbolic variables. They do not produce a numeric output. You can substitute numeric values for the syms to get a numeric output.
https://www.mathworks.com/help/symbolic/subs.html
https://www.mathworks.com/help/symbolic/symfun.html

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Numbers and Precision 的更多信息

标签

产品


版本

R2017a

Community Treasure Hunt

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

Start Hunting!

Translated by