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Problem with the lift_x fuction in SAGE

Hello,

When I work with an elliptic curve and i apply E.lift_x(1407284663933896236729058440000) i obtain the point (1407284663933896236729058440000 : 4215171991512676773155222850458328 : 1) and works fine.

My problem is when i have a value of x that don't in the curve and aplly E.lift_x(x) and it's generate a Raise of Error and stop my program. Well, i have to increment the value of x end try to another point E.lift_x(x+1) and works fine but the problem is that i can't reach that because Raise of Error stop my loop.

How can i debug that? Another fuction like lift_x?

Thank very much. I wait yor answers.

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updated 2012-06-16 18:59:27 -0600

DSM gravatar image

Problem with the lift_x fuction in SAGE

Hello,

When I work with an elliptic curve and i apply E.lift_x(1407284663933896236729058440000) i obtain the point (1407284663933896236729058440000 : 4215171991512676773155222850458328 : 1) and works fine.

My problem is when i have a value of x that don't in the curve and aplly E.lift_x(x) and it's generate a Raise of Error and stop my program. Well, i have to increment the value of x end try to another point E.lift_x(x+1) and works fine but the problem is that i can't reach that because Raise of Error stop my loop.

How can i debug that? Another fuction like lift_x?

Thank very much. I wait yor answers.