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Math Help - Matlab Question Help

  1. #1
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    Matlab Question Help



    Need help with this problem, I can understand how exactly to work it, could someone help?
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  2. #2
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    Quote Originally Posted by xpack View Post


    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
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  3. #3
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    You mean like finding
    f1=
    f2=
    ... and so on?
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  4. #4
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    Quote Originally Posted by xpack View Post
    You mean like finding
    f1=
    f2=
    ... and so on?
    No I mean:



    Now rewrite this as a matrix equation.

    CB
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  5. #5
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    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}<br />
       \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
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  6. #6
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    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?
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  7. #7
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    Quote Originally Posted by xpack View Post
    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
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