For annotating extrema on a discontinuous function graph, I wanted to use
limit() on a piecewise function, but it doesn't seem to be implemented yet?
Test case:
sage: limit(piecewise([[[0, 1], x], [(1, oo), 1/x]]), x = 1, dir='+')
Error in lines 18-18
Traceback (most recent call last):
File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py",
line 996, in execute
exec compile(block+'\n', '', 'single') in namespace, locals
File "", line 1, in <module>
File
"/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/calculus/calculus.py",
line 1337, in limit
l = maxima.sr_limit(ex, v, a, 'plus')
File
"/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py",
line 1000, in sr_limit
return max_to_sr(maxima_eval(([max_limit], L)))
File
"/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py",
line 1702, in max_to_sr
args=[max_to_sr(a) for a in max_args]
File
"/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py",
line 1703, in max_to_sr
return op(*args)
TypeError: __call__() takes exactly 2 arguments (3 given)
Only reference I could find is this 2013 question on ask.sagemath
>
https://ask.sagemath.org/question/10412/sage-support-fort-finding-the-limit-piecewise-function/
pointing to a 2010 thread here
> https://groups.google.com/forum/m/#!msg/sage-support/_aAT5sKUB9I/dyoYmZ8dbSMJ
which said it would have to be implemented at some point.
I'm using a sage worksheet on cocalc.com ('SageMath version 8.0, Release
Date: 2017-07-21').
Any workarounds, despite using infinitesimally close values?
#Best Regards/Marcel Partap
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