Dear all,
In previous versions of Sagemath, I was able to do perfectly the (symbolic)
integration of functions like unit_step( ), for example when doing symbolic
convolutions.But in the latest versions of Sagemath (like 8.9 and the updated
9.0) the following message appears:*RuntimeError: Encountered operator mismatch
in sr-to-maxima translation*
I wonder if the problem is related with the change in python (now in python3).
I would be very grateful if anyone could hep me on the subject.
The complete error message is:
File "/home/sc_serv/sagecell/interact_sagecell.py", line 122, in
update_interact_msg
update_interact(interact_id, name, content["values"][name], not
content["update_last"])
File "/home/sc_serv/sagecell/interact_sagecell.py", line 112, in
update_interact
interact_info["function"](control_vals=kwargs)
File "/home/sc_serv/sagecell/interact_sagecell.py", line 422, in adapted_f
returned = f(*args, **control_vals)
File "<ipython-input-1-b01a4322b3e5>", line 22, in _
fg = integrate(f(t=x)*g(t=t-x),x,Integer(0),t).simplify_full().expand()
File "sage/symbolic/expression.pyx", line 4738, in
sage.symbolic.expression.Expression.expand
(build/cythonized/sage/symbolic/expression.cpp:28851)
x = self._gobj.expand(0)
File "sage/symbolic/function.pyx", line 1226, in
sage.symbolic.function.BuiltinFunction._evalf_or_eval_
(build/cythonized/sage/symbolic/function.cpp:13413)
return self._eval0_(*args)
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/symbolic/integration/integral.py",
line 205, in _eval_
A = integrator(*args)
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/symbolic/integration/external.py",
line 46, in maxima_integrator
result = maxima.sr_integral(expression, v, a, b)
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 790, in sr_integral
return max_to_sr(maxima_eval(([max_integrate],[sr_to_max(SR(a)) for a in
args])))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 790, in <listcomp>
return max_to_sr(maxima_eval(([max_integrate],[sr_to_max(SR(a)) for a in
args])))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 1621, in sr_to_max
[sr_to_max(o) for o in expr.operands()]))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 1621, in <listcomp>
[sr_to_max(o) for o in expr.operands()]))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 1621, in sr_to_max
[sr_to_max(o) for o in expr.operands()]))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 1621, in <listcomp>
[sr_to_max(o) for o in expr.operands()]))
File
"/home/sc_serv/sage/local/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py",
line 1617, in sr_to_max
raise RuntimeError("Encountered operator mismatch in sr-to-maxima
translation")
RuntimeError: Encountered operator mismatch in sr-to-maxima translation
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