Dear all,
I am quite new to sage and right now I'm trying to perform quite a simple
numerical integration of the following form:
sage: integral(exp(-300.0/(-0.064*x+14.0)),x,0.0,120.0)
If I simply put "x" into the denominator instead of the linear function it
works fine. However, as shown, it sage throws an error that I don't understand:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_28.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n"
+
_support_.preparse_worksheet_cell(base64.b64decode("aW50ZWdyYWwoZXhwKC0zMDAuMC8oLTAuMDY0KngrMTQuMCkpLHgsMC4wLDEyMC4wKQ=="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpaMotjT/___code___.py", line 3, in <module>
exec compile(u'integral(exp(-_sage_const_300p0 /(-_sage_const_0p064
*x+_sage_const_14p0 )),x,_sage_const_0p0 ,_sage_const_120p0 )
File "", line 1, in <module>
File
"/home/sage/sage-5.0/local/lib/python2.7/site-packages/sage/misc/functional.py",
line 728, in integral
return x.integral(*args, **kwds)
File "expression.pyx", line 8745, in
sage.symbolic.expression.Expression.integral
(sage/symbolic/expression.cpp:33707)
File
"/home/sage/sage-5.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py",
line 633, in integrate
return definite_integral(expression, v, a, b)
File "function.pyx", line 413, in sage.symbolic.function.Function.__call__
(sage/symbolic/function.cpp:4678)
File
"/home/sage/sage-5.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py",
line 173, in _eval_
return integrator(*args)
File
"/home/sage/sage-5.0/local/lib/python2.7/site-packages/sage/symbolic/integration/external.py",
line 21, in maxima_integrator
result = maxima.sr_integral(expression, v, a, b)
File
"/home/sage/sage-5.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py",
line 747, in sr_integral
raise error
RuntimeError: ECL says: In function GCD, the value of the second argument is
1.0
which is not of the expected type INTEGER
Any ideas on how to resolve this issue? Any help is greatly appreciated.
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