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Asked by Dan on 30 Nov 2012

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!

Answer by Azzi Abdelmalek on 30 Nov 2012

Edited by Azzi Abdelmalek on 30 Nov 2012

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]

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Walter Roberson on 30 Nov 2012

R2011a did not support using == in symbolic expressions. I think it was R2011b that first supported that.

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

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