ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 02 Jul 2013 14:24:51 +0200Plot circle or ellipse with equation?https://ask.sagemath.org/question/10311/plot-circle-or-ellipse-with-equation/Given the standard equation of a circle:
x^2 + y^2 + 7*x - 2*y + 6 = 0 --Simplified-to--> (x+7/2)^2 + (y-1)^2 = 29/4
Standard formula of a circle: (x + (-h))^2 + (y + (-k))^2 = r^2
The center is represented by (h, k); radius by sqrt(r^2).
So my first question is, is there are way I could insert either of the 1st 2 equations and have Sage 5.9 generate the circle?
My second question similarly deals with an ellipse that has the simplified equation:
((x+2)^2)/9 + ((y-1)^2)/25 = 1
Its major axis is: (-2,-4) (-2,6)
Minor axis is: (-5,1) (1,1)
Standard form of an ellipse is: ((x - (-h))^2)/b^2 + ((y + (-k))^2)/a^2
Center is determined by analyzing the differences between the x2/x1, y2/y1 coordinates of the major or minor axis (i.e. midpoint formula).
Could I generate an ellipse baed on the simplified equation?
In case anyone's interested, the following thread has an unanswered question:
http://ask.sagemath.org/question/2764/graph-based-on-y-value-as-the-input-and-x-as-thebxdinTue, 02 Jul 2013 14:24:51 +0200https://ask.sagemath.org/question/10311/Human readable representation of formulashttps://ask.sagemath.org/question/10079/human-readable-representation-of-formulas/Hello,
i do have question regarding the representation of formulas in sage.
Is a formula typed into sage, the routines will transform the expression, which could be less human readable. How can I programm sage to use the typed in formula and still compute a solution?
Example:
f(h)=0.19+0.91*((h+140)/760)^2
will be transformed to
(1.57548476454294e-6)*(h + 140)^2 + 0.190000000000000
Sincerelyreb_rebMon, 29 Apr 2013 13:55:02 +0200https://ask.sagemath.org/question/10079/