Re: [sympy] Help with using Matrix on x.y pair

2012-12-01 Thread Shriramana Sharma
Hello and returning to this previous thread started by me: On Tue, Nov 13, 2012 at 2:25 AM, Stefan Krastanov krastanov.ste...@gmail.com wrote: But we can address this problem when we get an idea of the rest of what you are trying to do. Square_matrix_of_known_reals * Vector_of_unknown_pairs =

Re: [sympy] Help with using Matrix on x.y pair

2012-12-01 Thread Matthew Rocklin
Matrices can hold any type that inherits from Basic, the core SymPy type. Matrix operations will often assume that these types have associated + and * operators. Many of the algorithms of matrices assume that the elements of a matrix are SymPy expression objects (scalars). From what you say the

[sympy] Help with using Matrix on x.y pair

2012-11-12 Thread Shriramana Sharma
Hello. I'm new to SymPy. I am trying to implement an algorithm in Python for merging Bezier curves from this paper: http://cg.cs.tsinghua.edu.cn/~shimin/pdf/cad%202001_merging.pdf and in it (after spending quite some time in understanding the mathematics, as I am actually a humanities scholar) I

Re: [sympy] Help with using Matrix on x.y pair

2012-11-12 Thread Aaron Meurer
This looks like a manifestation of this bug: http://code.google.com/p/sympy/issues/detail?id=2663#c3. It's not clear why it is happening or how to fix it without seeing your definition if QPointF. Aaron Meurer On Nov 12, 2012, at 1:34 PM, Shriramana Sharma samj...@gmail.com wrote: Hello. I'm