[SciPy-user] Solve

Eduardo Rodrigues elr1979@gmail....
Tue Nov 6 10:31:39 CST 2007

```If I want to solve an equation with linalg.solve I must know the equation, right?

>From help:
"solve(a, b)
Return the solution of a*x = b"

But if I don't know - or if I don't want to look - the equation for x, how can I solve it?
I will import equations from a file.

[]'s.

----- Original Message -----
From: Michael Nandris
To: SciPy Users List
Sent: Tuesday, November 06, 2007 10:42 AM
Subject: Re: [SciPy-user] Solve

These examples for solving equations are in scipy_tutorial.pdf

from scipy import mat, linalg

"""
Solves three simultaneous equations:
x + 3y + 5z = 10
2x + 5y + z = 8
2x + 3y + 8z =3
"""

XYparameters = mat('[1 3 5; 2 5 1; 2 3 8]')
constants = mat('[10; 8; 3]')
print linalg.solve( XYparameters, constants )
# array([[-9.28],
#        [ 5.16],
#      [ 0.76]])

"""
Solves two simultaneous equations:
5x + 2y - 9 = 0
3x + 4y - 4 = 0
"""

XYparameters = mat('[5 2; 3 4]')
constants = mat('[9; 4]')
print linalg.solve( XYparameters, constants )  # should print (2,-0.5)

Eduardo Rodrigues <elr1979@gmail.com> wrote:
Hi, I am starting in Python. I usually use Maple and I am with a problem to
do the same project in Python.
I would like to solve an equation like x+y+1=0 for x. In Maple I use
"solve(x+y+1=0,x);".
Do exist a similar command in Python/NumPy/SciPy?
Regards,
Eduardo.

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