For those who've not read my latest blog, I'm working on implementing
a new structure for the matrices module of sympy.
I faced many decision problems while doing so, like what should be
named what and what should be where.
Should matrix and linear algebra be separated ?
I'm +1 for minimal code
+1 for good looking expressions '(...)' instead of 'Tuple(...)'.
On Jul 5, 9:05 pm, Mateusz Paprocki matt...@gmail.com wrote:
Hi,
On 5 July 2011 17:38, Vinzent Steinberg
vinzent.steinb...@googlemail.comwrote:
On Jul 5, 1:16 pm, Tom Bachmann e_mc...@web.de wrote:
I will change the code
Hello Amit,
The line of code you have given is not clear. Could you give a more
concrete example of a functionality that you're expecting ?
If you want to calculate the hessian of a function, Sympy has a
hessian function which takes in a function and a list of variables of
the function, and
Hello Matthew,
As Aaron says correctly, work on matrices and work on the matrix symbol is
quite separate.
The Matrix class provides fundamental operations like addition,
multiplication. We only have to make Add, Mul call the required routines in
the Matrix class.
I'm not sure what .flatten
https://github.com/sympy/sympy/pull/444
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on it or not.
Regards,
Sherjil Ozair
[1] https://github.com/sherjilozair/sympy/tree/lilmatrix
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sympy
a lot.
I think this implies that matrix over finite fields can be solved for
certain or all cases.
Will update if I have more good news.
Sherjil Ozair
On Jun 21, 6:34 am, SherjilOzair sherjiloz...@gmail.com wrote:
On Jun 21, 4:45 am, Craig McQueen googlegro...@craig.mcqueen.id.au
wrote
On Jun 12, 3:09 am, Vinzent Steinberg
vinzent.steinb...@googlemail.com wrote:
On 11 Jun., 10:47, SherjilOzair sherjiloz...@gmail.com wrote:
Do you require to solve eigenvalue problems of matrices bigger than
4*4 ?
How are you doing it currently ?
Matrix.diagonalize only works
than the other.
Aaron Meurer
On Sun, Jun 12, 2011 at 6:49 AM, SherjilOzair sherjiloz...@gmail.com wrote:
On Jun 12, 3:09 am, Vinzent Steinberg
vinzent.steinb...@googlemail.com wrote:
On 11 Jun., 10:47, SherjilOzair sherjiloz...@gmail.com wrote:
Do you require to solve
. Or direct me to pieces of code which generate the matrices that
you use.
On Sat, May 28, 2011 at 6:56 AM, SherjilOzair sherjiloz...@gmail.com wrote:
I would like to know how and where Sympy's matrices are used.
Is Sympy matrices used for numeric computing anywhere ?
Are Sympy Matrices
, but in
many cases we really want the symbolic forms.
On Sat, May 28, 2011 at 6:56 AM, SherjilOzair sherjiloz...@gmail.com
wrote:
I would like to know how and where Sympy's matrices are used.
Is Sympy matrices used for numeric computing anywhere ?
Are Sympy Matrices expected to offer any
I meant the Frac class.
On Jun 11, 1:48 pm, SherjilOzair sherjiloz...@gmail.com wrote:
Aaron, it would be wonderful if we could discuss the implementation of
the Frac function.
On Jun 2, 10:37 pm, Aaron Meurer asmeu...@gmail.com wrote:
I use Matrices in the Risch algorithm
/184/files (lines 534, 536,
573, 575, 599, etc.)
On Jun 2, 9:55 am, Mateusz Paprocki matt...@gmail.com wrote:
Hi,
On 2 June 2011 06:37, SherjilOzair sherjiloz...@gmail.com wrote:
This hasn't been implemented yet. Should I go ahead and add it ?
sums for QQ, etc also needed.
First it would
I added my views there.
http://code.google.com/p/sympy/issues/detail?id=2042
On Jun 2, 9:34 am, SherjilOzair sherjiloz...@gmail.com wrote:
I need review on this style for matrix groundtypes, i.e. having a list
of builtin dtypes, and an other option for misc backends.
Do you think the list
work inside numpy matrices?
Are you considering making sympy.Expr work inside scipy.sparse matrices?
Cheers,
Brian
On Wed, Jun 1, 2011 at 9:27 PM, SherjilOzair sherjiloz...@gmail.com wrote:
scipy.sparse implements a dtype kwarg argument, but which currently
cannot take in arbitrary unknown types
How about having having two folders, dense and sparse, in the matrices folder.
The dense folder contains densematrix.py and linalg.py. densematrix.py contains
the class DenseMatrix (the current Matrix class, or should the name remain the
same ? ). The sparse folder has dokmatrix.py, linalg.py.
Mac:sympy sherjilozair$ git checkout cholesky
Switched to branch 'cholesky'
Mac:sympy sherjilozair$ bin/isympy
Segmentation fault
Mac:sympy sherjilozair$ git diff
Mac:sympy sherjilozair$
I tried it with a non-experimental branch. It still doesn't work. That
means, the sympy code is fine.
import
Issue resolved.
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scipy.sparse implements a dtype kwarg argument, but which currently
cannot take in arbitrary unknown types though.
One thing that can be done about this, is to define an interface for
the dtype. It would be taken for granted that it will have +, *, /
defined. Checks will be used in algorithms if
, and user wants to take its inverse, then the dtype will
automatically be changed to Rational, and the inverse calculated in
the Rational field. The original Matrix however would remain the same.
( In accordance to immutability).
On Jun 2, 9:27 am, SherjilOzair sherjiloz...@gmail.com wrote:
scipy.sparse
This hasn't been implemented yet. Should I go ahead and add it ?
sums for QQ, etc also needed.
See [1] for the types I need.
[1] http://groups.google.com/group/sympy/browse_thread/thread/c793f7030853f3da
On May 31, 9:43 pm, Vinzent Steinberg
vinzent.steinb...@googlemail.com wrote:
On May 30,
?
- Sherjil Ozair
On May 28, 11:34 pm, Mateusz Paprocki matt...@gmail.com wrote:
Hi,
On 28 May 2011 15:30, SherjilOzair sherjiloz...@gmail.com wrote:
Hello everyone,
I've been successful in writing the symbolic cholesky decomposition
for sparse matrices in O(n * c**2) time
On May 29, 3:44 pm, SherjilOzair sherjiloz...@gmail.com wrote:
Thanks for the pointers. I'm working on what you said.
Here are a few questions.
1. Poly(123) should not give an error, why not treat it as a constant
polynomial ?
2. I used construct_domain on the list of elements of the Matrix
-equivalence problem would
be to check if the numerator is zero only, etc.
What does the community think about this class, the RationalFunction ?
Do add ideas from your knowledge and experience also.
On May 29, 3:49 pm, SherjilOzair sherjiloz...@gmail.com wrote:
Could you explain why normal multiplication
Why didn't anyone think of this before ?!
Q : What benefits does groundtypes give ?
A : Operations are faster, as one does not have to type-check. Each
groundtype has its own __add__, __mul__ installed, and global Add, Mul
are avoided. The Matrix doesn't have to worry about the zero-
equivalence.
, SherjilOzair wrote:
Why didn't anyone think of this before ?!
Q : What benefits does groundtypes give ?
A : Operations are faster, as one does not have to type-check. Each
groundtype has its own __add__, __mul__ installed, and global Add, Mul
are avoided. The Matrix doesn't have to worry
: [sympy] Re: Borrowing ideas from Polys to Matrix
Hi,
On 29 May 2011 12:49, SherjilOzair sherjiloz...@gmail.com wrote:
Could you explain why normal multiplication/addition operations on
Poly is slower than on Muls and Adds, when Poly is supposed to be
lower level than Mul, Add ?
In some cases
Hello everyone,
I've been successful in writing the symbolic cholesky decomposition
for sparse matrices in O(n * c**2) time. This is a reasonable order
for sparse systems, but still the performance is not very good. Using
python bulitins, It factors a 100 * 100 Matrix with sparsity 0.57 in
961
I would like to know how and where Sympy's matrices are used.
Is Sympy matrices used for numeric computing anywhere ?
Are Sympy Matrices expected to offer any advantage that matrices in
numpy/scipy or other libraries cannot offer ?
Is its use limited to symbolic ? What size of Matrices with
Taking into account the views of Aaron, Ronan, and Vinzent on whether
to follow an OO or procedural design, I think the best idea (as it
always had been) would be to use a combination of both. The high level
user interface would be and also appear completely OO. However the
core would contain
, SherjilOzair sherjiloz...@gmail.com
wrote:
By 'rational function terms' and'general expression terms' do you mean
that a matrix should take Expr objects as elements ?
Of course, I missed to add it in the list of groundtypes. Felt it was
obvious.
On May 13, 4:53 am, Aaron Meurer
A very smart and to-the-point question, Matthew. I've been wanting the
answer to this question myself when working on my project. The answer
to this question is critical for code writing.
Another issue I would like to raise, that I believe is related to this
topic, is a phrase in the Sympy
Did I leave anything Vinzent ?
On May 13, 3:51 am, Sherjil Ozair sherjiloz...@gmail.com wrote:
Hello everyone,
I took ideas from mattpap's thesis at [1], specifically the idea of multi
level structure.
The hierarchy I have in mind is
Level 0 : A collection of functions that operate on
By 'rational function terms' and'general expression terms' do you mean
that a matrix should take Expr objects as elements ?
Of course, I missed to add it in the list of groundtypes. Felt it was
obvious.
On May 13, 4:53 am, Aaron Meurer asmeu...@gmail.com wrote:
I think a Matrix could also have,
On May 13, 5:23 am, Ronan Lamy ronan.l...@gmail.com wrote:
Le vendredi 13 mai 2011 à 03:51 +0400, Sherjil Ozair a écrit :
Hello everyone,
I took ideas from mattpap's thesis at [1], specifically the idea of
multi level structure.
The hierarchy I have in mind is
Level 0 : A
Hey everyone,
The pull request 184 [0] has some work on Cholesky and LDL
decomposition with some very useful auxiliary functions like
triangular and diagonal solves.
Its been waiting to be pushed in for a long time now. It enables
solving for least square which currently sympy completely lacks.
Brian,
Could you give an example of how you construct large sparse matrices.
What sort of constructors would you like to see in the class ?
Are there any special class of sparse matrices that you guys use
often, like tridiagonal matrix or permutation matrix ?
I should also mention that we are
Hello Andy,
I'm working to submit a proposal on Sparse Matrices for this GSoC.
I wanted some help regarding the project. Would be very grateful if
you could help me.
According to my calculations, I'd take roughly 8 weeks to implement a
full SMatrix class and rewriting Matrix class to add GMPY
Hi Hector,
You raise a very interesting problem. Its surprising Sympy doesn't
have this already. Do you have this functionality coded in for a
general function f(x) ? Would like to see your code.
Regards,
Sherjil Ozair
On Mar 28, 12:06 pm, Hector hector1...@gmail.com wrote:
Hello ppl,
I was
Cool ideas, indeed. Very useful, I'm sure, and quite easy to
implement.
For the abstract Matrix part, A new constructor-less data-less class
AbstractMatrix which inherits class Matrix. This class' objects will
serve as pointers to Matrices. And the object would later be made to
point to a
Hello all,
My name is Sherjil Ozair and I'm a first year student of Indian
Institute of Technology, Delhi pursuing a dual degree(B.Tech +M.Tech)
in Computer Science and Engineering. I got to know about GSoC just a
couple of weeks back. I have an immense passion for coding and
algorithms, and have
I'll also code in a function which converts a normal Matrix class to a
Sparse Matrix representation.
I'll use the List of Non-zero values method, ie a list of
(coordinates,value) tuple, sorted coordinate-wise with the earlier
coordinate having more precedence.
This is as yet, the most elegant
Thank you,
I've been reading the Matrices class.
The SMatrix class borrows its transpose, determinant and mult
functions from Matrix, and thus is inefficient for Sparse Matrices.
The transpose doesn't even work for SMatrix.
a=SMatrix(10,10,lambda i,j:isprime(i))
a.T
Traceback (most recent
Thank you for your reply, Aaron.
A few small independent things can be implemented from this project.
But the problem is that Sympy lacks the base infrastructure, for me to
add anything remarkable.
Effort would be first put in to make a infrastructure and design a web
of class hierarchies, which
wrote:
Sounds good. Let us know if you need help making the patch using git.
Aaron Meurer
On Mar 19, 2011, at 4:03 AM, SherjilOzair wrote:
Thank you,
I've been reading the Matrices class.
The SMatrix class borrows its transpose, determinant and mult
functions from Matrix, and thus
The Set class of sympy is not complete.
I plan to add a full FiniteSet class functionality which will inherit
the Set class, we can also have an InfiniteSet abstract class later
which Interval and Union can inherit.
A FiniteSet would behave something like this,
a=Set([1,2,3,4,5])
Hi,
I'm working on a small base implementation of numpy-style array for
sympy.
Currently I've added component-wise addition, subtraction,
multiplication, mult by integer. I've uploaded the code on GitHub.
Here are some points of discussion.
1) If unequal-sized arrays are added, should an error
Thank you Mr Aaron,
Many issues like issue 754 which interest me, but when I try to
reproduce the error, It's already fixed.
Issue 754 says :
Here is a nice integral that SymPy is able to compute:
from sympy import *
var('y')
y
a = integrate((16*y-16)/(y**4-2*y**3+4*y-4), (y, 0, 1))
a =
How to edit modules to make patches ?
What is the cleanest method to do this, that will make debugging and
testing easier ?
I'm working on the vectorization of subs.
Will make it possible that one can give a list of substitutions for a
variable.
for example,
x=Symbol('x')
e=x**2
a=[1,2,3]
Mr. Ronan,
You've been a great help. Please help me start up my suggesting me a
small project or patch.
I would be very grateful.
Thanks,
Sherjil
On Mar 17, 10:46 pm, Ronan Lamy ronan.l...@gmail.com wrote:
Le jeudi 17 mars 2011 à 10:12 -0700, SherjilOzair a écrit :
How to edit modules
Hi, My name is Sherjil, and I'm a first year Engineering student in
IIT Delhi, India.
I have some coding experience, and I'm very interested in putting math
and code together for sympy.
Could you suggest me a small project in sympy to help me get started.
Thanks,
Sherjil Ozair
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, Ondrej Certik ond...@certik.cz wrote:
Hi Sherjil,
On Wed, Mar 16, 2011 at 3:50 PM, SherjilOzair sherjiloz...@gmail.com wrote:
Hi, My name is Sherjil, and I'm a first year Engineering student in
IIT Delhi, India.
I have some coding experience, and I'm very interested in putting math
and code
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