# Math Help - Matlab Question Help

1. ## Matlab Question Help

Need help with this problem, I can understand how exactly to work it, could someone help?

2. Originally Posted by xpack

Need help with this problem, I can understand how exactly to work it, could someone help?
The first thing to do is write those equations out in an orderly fashion as a set of linear equations in the F's and convert that into matrix form. Have you done that? What do you get?

CB

3. You mean like finding
f1=
f2=
... and so on?

4. Originally Posted by xpack
You mean like finding
f1=
f2=
... and so on?
No I mean:

Now rewrite this as a matrix equation.

CB

5. Write it out so its in the form $Ax = b$.

$A$ will be a 9x9 matrix. The first row might occurding to your first equation would be

$\left[ \begin{matrix}
\frac{1}{\sqrt{2}} & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \end{matrix} \right]$

Captain Black has beat me to it so I will not go any further (I am still very slow with Latex)

Regards Elbarto

6. Okay i got the matrix equation

A= [ cosd(45),1,0,0,0,0,0,0,0; -cosd(45),0,0,1,cosd(48.81),0,0,0,0; -sind(45),0,-1,0,-sind(48.81),0,0,0,0; 0,0,0,-1,0,0,0,cosd(48.81),0; 0,0,0,0,0,0,-1,-sind(48.81),0; 0,0,0,0,-cosd(48.81),1,0,0,1; 0,0,0,0,sind(48.81),0,1,0,0; 0,0,0,0,0,0,0,sind(48.81),0; 0,0,0,0,0,0,0,-cosd(48.81),-1 ]

Now where do I go from here?

7. Originally Posted by xpack
Okay i got the matrix equation

A= [ cosd(45),1,0,0,0,0,0,0,0; -cosd(45),0,0,1,cosd(48.81),0,0,0,0; -sind(45),0,-1,0,-sind(48.81),0,0,0,0; 0,0,0,-1,0,0,0,cosd(48.81),0; 0,0,0,0,0,0,-1,-sind(48.81),0; 0,0,0,0,-cosd(48.81),1,0,0,1; 0,0,0,0,sind(48.81),0,1,0,0; 0,0,0,0,0,0,0,sind(48.81),0; 0,0,0,0,0,0,0,-cosd(48.81),-1 ]

Now where do I go from here?
F=A\[0,0,1000,0,500,0,4000,-1105.14,0]'

should do it.

CB