"ALL" numerical solutions for system of equations

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Hi. My question is a multivariable version of the question; http://ask.sagemath.org/question/66/h...

I would like to know is there is a good function on sage that find "all" solutions for a given non-linear system of equations, just like the NSolve function on mathematica does.

I found several functions for numerical computation but they are only for one-variable or require initial value, which meas we can find only one solution.

Do you know any good function for my purpose?

Regards,