Dear Folks,
Pardon for the double-posting since I am unsure which list is more
appropriate.
In section 2.4.1 of the Sage Tutorial, there is a non-linear equation
example from Jason Grout that I tried out, but it failed. Details follow.
My version is built from the Ubuntu jaunty package source and runs on a
Kubuntu Intrepid AMD 64 PC. The startup banner is
----------------------------------------------------------------------
| SAGE Version 3.0.5, Release Date: 2008-07-11 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
When I load the file with these contents for the example:
===
var('x y p q')
(x, y, p, q)
eq1 = p+q==9
eq2 = q*y+p*x==-6
eq3 = q*y^2+p*x^2==24
solve([eq1,eq2,eq3,p==1],p,q,x,y)
===
I get this error (with directory paths anonymized):
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/Path-To-File_non_linear_eq_sage_0.py in <module>()
8 eq2 = q*y+p*x==-Integer(6)
9 eq3 = q*y**Integer(2)+p*x**Integer(2)==Integer(24)
---> 10 solve([eq1,eq2,eq3,p==Integer(1)],p,q,x,y) 11
12
/usr/lib/python2.5/site-packages/sage/calculus/equations.pyc in solve(f,
*args, **kwds)
1386 s = m.solve(args)
1387 except:
-> 1388 raise ValueError, "Unable to solve %s for %s"%(f, args)
1389 a = repr(s)
1390 sol_list = string_to_list_of_solutions(a)
ValueError: Unable to solve [q + p == 9, q*y + p*x == -6, q*y^2 + p*x^2
== 24, p == 1] for (p, q, x, y)
WARNING: Failure executing file: <Path-To-File_non_linear_eq_sage_0.py>
---------------------------------------------------------------------------
The version of the tutorial that I am using came with the version of
Sage installed. So, I do not think it is a version incmpatibility problem.
Can someone tell me what the workaround is, or whether I need to file a
bug report.
Thank you.
Chandra
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