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 Author Comment/Response fabian 04/20/07 02:32am Dear Mathematica Users, I am new to Mathematica and in the last couple of days got familiar with the standard principles and functions. Now I am trying to implement a matrix transformation and elimination of the old variables. My basic problem is that I don't know how to implement it in the system. Defining the functions and matrices was not a problem: eq1 = omega' == (-Km ia Sin[N theta] + Km ib Cos[N theta] - B omega)/J eq2 = ia' == (va - R ia + Km omega Sin[N theta])/L eq3 = ib' == (vb - R ib - Km omega Cos[N theta])/L eq4 = theta' == omega T = {{Cos[N theta], -Sin[N theta]}, {Sin[N theta], Cos[N theta]}} vPark = {vd, vq} v = {va, vb} Solve[vPark == T .v, v] iPark = {id, iq} i = {ia, ib} Solve[iPark == T.i, i] Eliminate[{eq1, eq2, eq3}, {ia, ib, va, vb}] This is what I have so far. But the last input (Eliminate[{eq1, eq2, eq3}, {ia, ib, va, vb}]) doesn't work. What do I have to do to get my first three equations (eq1, eq2, eq3) wihtout ia, ib, va and vb but with vd, vq, id and iq??? I appreciate any suggestions. Thanks a lot in advance. Cheers Fabian URL: ,

 Subject (listing for 'Eliminating variables out of 3 equations') Author Date Posted Eliminating variables out of 3 equations fabian 04/20/07 02:32am Re: Eliminating variables out of 3 equations yehuda ben-s... 05/17/07 04:24am
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