Eli wrote:
> Hello,
> In the sage tutorial, I found how to solve equations:
>
> sage: x, b, c = var('x b c')
> sage: solve([x^2 + b*x + c == 0],x)
> [x == (-sqrt(b^2 - 4*c) - b)/2, x == (sqrt(b^2 - 4*c) - b)/2]
>
> However, I could not find how to assign the solution to some variable.
> That is, something that will do:
> assign the value (-sqrt(b^2 - 4*c) - b)/2 (first solution of the
> equation) to the variable X
> assign the value (sqrt(b^2 - 4*c) - b)/2 (second solution of the
> equation) to the variable Y
>
> How can this be done ?
>
Here is a session showing one way to accomplish that. The key is the
solution_dict argument.
sage: f=x^2+b*x+c == 0
sage: soln = f.solve(x,solution_dict=True)
sage: soln
[{x: (-sqrt(b^2 - 4*c) - b)/2}, {x: (sqrt(b^2 - 4*c) - b)/2}]
sage: soln[0][x]
(-sqrt(b^2 - 4*c) - b)/2
sage: soln[1][x]
(sqrt(b^2 - 4*c) - b)/2
sage: X=soln[0][x]
sage: Y=soln[1][x]
sage: X
(-sqrt(b^2 - 4*c) - b)/2
sage: Y
(sqrt(b^2 - 4*c) - b)/2
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