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  • Dec 06 20:04

    Marlin-Na on master

    Add license for cmake/cotire.cm… Merge pull request #1628 from M… (compare)

  • Dec 06 20:04
    Marlin-Na closed #1628
  • Dec 06 19:13
    Marlin-Na commented #1628
  • Dec 06 19:04
    Marlin-Na opened #1628
  • Dec 06 19:02
    certik commented #1626
  • Dec 06 18:20

    Marlin-Na on master

    Update license for bison parser Merge pull request #1627 from M… (compare)

  • Dec 06 18:20
    Marlin-Na closed #1627
  • Dec 06 18:20
    Marlin-Na closed #1626
  • Dec 06 18:12
    Marlin-Na opened #1627
  • Dec 06 16:42
    certik commented #1626
  • Dec 06 16:34
    Marlin-Na commented #1626
  • Dec 06 16:34
    Marlin-Na opened #1626
  • Dec 03 23:52
  • Dec 03 12:58
    nkitagrawal starred symengine/symengine
  • Nov 22 13:34
    csavur starred symengine/symengine
  • Nov 21 21:28
    certik closed #1620
  • Nov 21 21:28
    certik commented #1620
  • Nov 17 23:57
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  • Nov 16 11:59
    miRoox starred symengine/symengine
  • Nov 14 13:07
    jmig5776 commented #1625
Marcello
@torshind_gitlab
Do you have any idea how to eliminate the spurious 0.0 when the coefficients are double?
Isuru Fernando
@isuruf
Its a tough one. We want expand(4.0*(x + y - (x+y))) to give 0.0 instead of 0 to make it clear that the expression is inexact (floating point vs integer)
You can eliminate 0.0 in the final expression by checking if the expression is an Add and if the coefficient is 0.0, remove it
But that doesn't fix 0.0 in intermediate expressions
On second thought, returning 0 for expand(4.0*(x + y - (x+y))) is totally fine
Isuru Fernando
@isuruf
Currently, in symengine 0 * 4.0 gives 0.0, but it should probably return 0. @certik, what do you think?
Isuru Fernando
@isuruf
Marcello
@torshind_gitlab
I deleted my previous message because I verified that the workaround that I've proposed doesn't work. Sorry for the confusion.
Isuru Fernando
@isuruf
@torshind_gitlab, you need to use integer(0) as the coefficient in the code you posted previously
Marcello
@torshind_gitlab
yep, if get_coef()->is_zero() is true, forcing an exact coefficient does the trick
thanks again @isuruf
Isuru Fernando
@isuruf
@richardotis, @bocklund, I've released 0.4.1 of symengine. With conda you can use python-symengine 0.4.0 and symengine 0.4.1
I could use some help in fixing the tests of symengine.py at symengine/symengine.py#289
Steven Lee
@stevenleeS0ht
Is there versioning compatibility requirement between symengine and python-symengine?
Isuru Fernando
@isuruf
@stevenleeS0ht, yes, we usually only support one version of symengine recorded at https://github.com/symengine/symengine.py/blob/master/symengine_version.txt
Carl Poppa
@tgn3000

@isuruf Hi Isuru, long time no see! Was wondering if the following behavior is expected. Thanks!! (master, ed7479baf59a36636061acc35b676bcf9073a932)

int main() {
  RCP<const Basic> a = symbol("a"), b = symbol("b"), c = symbol("c");
  map_basic_basic d {{mul(a,b), c}};
  RCP<const Basic> r1 = mul(SymEngine::integer(2), mul(a, b)),
  r2 = add(SymEngine::integer(1), r1);
  std::cout << *r1 << " -> " << *r1->subs(d) << std::endl;
  std::cout << *r2 << " -> " << *r2->subs(d) << std::endl;
  return 0;
}

produces

2*a*b -> 2*a*b
1 + 2*a*b -> 1 + 2*c
Isuru Fernando
@isuruf
@tgn3000, looks like an oversight
Note that, we have
2*a*b*c -> 2*a*b*c
1 + 2*a*b*c -> 1+2*a*b*c
Richard Otis
@richardotis
Hi @isuruf , do you have a sense what the blockers are for the next release of symengine.py? The new as_ctypes API enables some really nice solver accuracy improvements for us downstream, and also lets pycalphad resolve an install-time bug related to finding libsymengine.
Isuru Fernando
@isuruf
@richardotis, I'd like to get #1596, #1582, #1592 done

The new as_ctypes API enables some really nice solver accuracy improvements for us downstream

What's the difference between this and the cython one?

Richard Otis
@richardotis
Two things: it supports the lambda backend with nogil calling (current release doesn't), and it eliminates symengine as a build-time dependency
Richard Otis
@richardotis
@isuruf Thanks for your hard work getting the new release out there. Our downstream CI picked it up without skipping a beat.
Sylvain Corlay
@SylvainCorlay
:+1:
Jogi Miglani
@jmig5776
Can anybody please guide me on this symengine/symengine#1617?
Ondřej Čertík
@certik
@jmig5776 I just replied there.
Jogi Miglani
@jmig5776
Yaa I am on it.Thanks
Dario Izzo
@darioizzo
Is there a user documentation for symengine? I am struggling to find one ...
Isuru Fernando
@isuruf
@darioizzo, it's at https://symengine.github.io/classSymEngine_1_1Add.html , but it has close to zero documentation
Björn Dahlgren
@bjodah
@darioizzo even though it's not a 1:1 mapping, SymPy's documentation is a good place to look since many functions are essentially a reimplementation in C++. Also, I find the tests in SymEngine to be quite approachable for examples of usage.
Jogi Miglani
@jmig5776
Btw can anyone tell me that what's the plan for documentation for symengine, because I myself facing very much problems while implementing cancel for apart ....if there is predefined plan then I would like to help in that
ronald00773
@ronald00773
How to install symengine for python 3 using macports? I tried using sudo port install symengine and I was not able to use in python3
Isuru Fernando
@isuruf
@ronald00773, install pip and then do python3 -m pip install symengine
ronald00773
@ronald00773
thanks @isuruf