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Pedro Silva
05/30/08 3:35pm

Hi!
I am programming with mathematica for the first time for a numerical methods project. I really don't know much about the functions mathematica have, i just think in C and try to export things to mathematica. In the end, I'm having a little troule with an augmented matrice.

I'm joining TR and J into Aux, where TR is the transpose of a vector and J is the jacobi matrix of a 2D non-linear equation. I need to join them and use the Gauss elimintion method (asked by the professor).

My problem is that my Aux matrice is 2D, x and y, and I wanted to assign a P to x and y, where P is a vector containing the value of x an y.
When I try the Aux[P] it goes crazy :S


Code:
Aux = ReplacePart[Aux, {1, 3} -> tr[[1, 1]]];
Aux = ReplacePart[Aux, {2, 3} -> tr[[2, 1]]];
Aux = ReplacePart[Aux, {1, 1} -> J[[1, 1]]];
Aux = ReplacePart[Aux, {1, 2} -> J[[1, 2]]];
Aux = ReplacePart[Aux, {2, 1} -> J[[2, 1]]];
Aux = ReplacePart[Aux, {2, 2} -> J[[2, 2]]];

Aux = -4+4 x   -6 y^2    1-4 x+2 x^2-2 y^3
4 x^3   4+16 y^3   -4+x^4+4 y+4 y^4


Aux[P] is just Aux multiplied by the vector P. How can I make mathematica recognise P as the values os x and y?


Can someone help please?

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Subject (listing for 'Matrices')
Author Date Posted
Matrices Pedro Silva 05/30/08 3:35pm
Re: Matrices Randy Silvers 05/31/08 01:57am
Re: Re: Matrices Pedro Silva 05/31/08 08:50am
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