I have just installed sage and suffer this too. The problem affects more
common things than only solving equations and diff/integrate. For
example, I take a very simple example from sect. 4.2 of Sage Reference
Manual:
sage: a,b,c=var('a,b,c')
sage: qe=(a*x^2+b*x+c==0)
sage: print qe
and instead of
2
a x + b x + c == 0
I get
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (865, 0))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (387, 0))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (805, 0))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (785, 0))
and etc.
And similar things occure for many other examples. Interesting that the
following from "Sage constructions" works well:
sage: R = PolynomialRing(QQ, 4, 'abcd', order='lp')
sage: a,b,c,d = R.gens()
sage: I = (a+b+c+d, a*b+a*d+b*c+c*d, a*b*c+a*b*d+a*c*d+b*c*d, a*b*c*d-1)*R; I
Ideal (a + b + c + d, a*b + a*d + b*c + c*d, a*b*c + a*b*d + a*c*d + b*c*d,
a*b*c*d - 1) of Multivariate Polynomial Ring in a, b, c, d over Rational Field
sage: B = I.groebner_basis(); B
[c^2*d^6 - c^2*d^2 - d^4 + 1,
c^3*d^2 + c^2*d^3 - c - d,
b*d^4 - b + d^5 - d,
b*c - b*d + c^2*d^4 + c*d - 2*d^2,
b^2 + 2*b*d + d^2,
a + b + c + d]
but when I add some extra variables (which should be treated as
parameters), it crashes:
sage: R = PolynomialRing(QQ, 4, 'abcd', order='lp')
sage: a,b,c,d = R.gens()
sage: p,q = var('p,q')
sage: I = (a*p+b*q+c+d, a*b+a*d+b*c+c*d, a*b*c+a*b*d+a*c*d+b*c*d, a*b*c*d-1)*R
Exception pexpect.EOF: EOF() in 'sage.structure.parent._unregister_pair' ignored
Maxima crashed -- automatically restarting.
Exception pexpect.EOF: EOF() in 'sage.structure.parent._unregister_pair' ignored
Maxima crashed -- automatically restarting.
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (805, 0))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (785, 0))
and etc.
Maybe something wrong in the interface with maxima or in the maxima
itself...
--
Sage crashes on solve/diff/integrate
https://bugs.launchpad.net/bugs/487088
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