#7742: add a compose function to sage
------------------------------------------------+---------------------------
Reporter: was | Owner: AlexGhitza
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.6.1
Component: basic arithmetic | Keywords:
Author: Christopher Olah, Felix Lawrence | Upstream: N/A
Reviewer: Paul Zimmermann | Merged:
Work_issues: |
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Changes (by newvalueoldvalue):
* status: needs_review => needs_work
* reviewer: => Paul Zimmermann
* author: => Christopher Olah, Felix Lawrence
Comment:
This needs more work, since the function {{{self_compose}}} fails for n=0:
{{{
sage: function('f');
sage: h=self_compose(f,0)
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/localdisk/tmp/sage-4.6/<ipython console> in <module>()
/localdisk/tmp/sage-4.6/local/lib/python2.6/site-
packages/sage/misc/misc.pyc in self_compose(f, n)
890 # all necessary powers of two (f, f^2, f^4), storing them in a
list
891 fs = [f]
--> 892 for i in xrange(int(floor(log(n, 2)))):
893 fs.append(compose(fs[i], fs[i]))
894
ValueError: math domain error
}}}
Paul
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7742#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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