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2013-06-03 08:22:37 +0100 commented answer Limit computation causes Sage to crash

thanks for the bug report.

2013-06-03 06:42:57 +0100 asked a question Limit computation causes Sage to crash

The following code :

f(x)=(x^x-sin(x)^sin(x))/(x^3*log(x))
show(f)
f(x).limit(x=0)

causes Sage to crash [the expected output is 1/6].

My desktop Sage installation gives the following error message :

;;;
;;; Detected access to protected memory, also kwown as 'bus or segmentation fault'.
;;; Jumping to the outermost toplevel prompt
;;;

The online Sage notebook tells me :

;;;
;;; Binding stack overflow.
;;; Jumping to the outermost top

What is wrong ?

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2013-02-12 03:06:29 +0100 asked a question Extracting a matrix from linear expressions

Suppose I have a vector depending on symbolic parameters, say v=vector([a-b, b-c, c-a]). How to extract the matrix naturally associated with the vector v ? I mean the matrix M

1 -1 0
0 1 -1
1 0 -1

since vector([a, b, c]) * M == v. In fact I need the equivalent to the Maple command GenerateMatrix.