Solving ODE

[EDIT: 20110530 22:44 CDT - clarify - WDR]

 hey . how i solve this linear equations (ODE) in matlab 

x-y-5z-5=0
3x+y-3z=5
y+4=z

[Walter Roberson]

Those are not ODE: there is no differential term anywhere in them.

Answer 1

[Walter Roberson]

x_y_z = [1 -1 -5;3 1 -3;0 1 -1] \ [5 5 -4].';

And crosschecking the second line:

>> 3*x_y_z(1)+x_y_z(2)-3*x_y_z(3) ans = 5

The values in the matrix to the left of the \ have been read off from the x, y, and z coefficients of the linear equations. The values in the vector to the right of the \ have been read off from the implicit right hand sides (constant terms) of the linear equations.

Answer 2

[zizo]

thanks man