#6799: Speed up symbolic comparison
-------------------------+--------------------------------------------------
Reporter: gmhossain | Owner:
Type: enhancement | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Reviewer: | Author:
Merged: |
-------------------------+--------------------------------------------------
It takes too long to check whether x is in a list in new symbolics
{{{
sage: var('x,x1,x2,x3,x4')
(x, x1, x2, x3, x4)
sage: f = function('f')
sage: mylist = [x1,x2,x3,x4,f(x1),f(x2),f(x3),f(x4)]
sage: timeit('x in mylist')
5 loops, best of 3: 461 ms per loop
}}}
If we need to check it couple of more times
then it becomes worse
{{{
sage: timeit('x in mylist')
5 loops, best of 3: 1.26 s per loop
sage: timeit('x in mylist')
5 loops, best of 3: 3.4 s per loop
}}}
For a comparison
{{{
sage: timeit('x1 in mylist')
625 loops, best of 3: 473 ns per loop
}}}
Reason for this huge discrepancy stems from the fact that
except for last example, in all previous cases maxima is called
to check the equality.
See this thread for more:
http://groups.google.com/group/sage-
devel/browse_thread/thread/d2275cb5b3d63317
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6799>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en
-~----------~----~----~----~------~----~------~--~---
