How to solve a system of equations symbolically? (MATLAB R2011a)

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Dan 2012-11-30

This is what I'm trying to do:

    syms x1 x2 x3 X1 X2 X3 t
    S = solve('x1 = 3*t*X1+X2', 'x2 = 2*t^2*X2', 'x3 = 5*t*X3')
    S = [S.X1 S.X2 S.X3]

I get a reference to non-existent field error though.

It's solving for x1, x2, and x3, but need to solve for X1, X2, and X3 in terms of x1, x2, x3 and t.

Please help! Thanks!

Azzi Abdelmalek 2012-11-30

编辑：Azzi Abdelmalek 2012-11-30

    syms x1 x2 x3 X1 X2 X3 t
    S = solve(x1==3*t*X1+X2, x2==2*t^2*X2, x3==5*t*X3,X1,X2,X3)
    S = [S.X1 S.X2 S.X3]

Azzi Abdelmalek 2012-11-30

Then no need to use syms

Walter Roberson 2012-12-1

Yes, correct. If everything is quoted, syms is not needed.

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