I was prepairing some exercises and I got some errors using differente
algorithms for integral, using version 8.0. Integrating with
mathematica_free, I got this error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_4.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("aW50ZWdyYWwoeCx4LGFsZ29yaXRobT0nbWF0aGVtYXRpY2FfZnJlZScp"),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpfvk1XJ/___code___.py", line 2, in <module>
exec compile(u"integral(x,x,algorithm='mathematica_free')" + '\n', '',
'single')
File "", line 1, in <module>
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/misc/functional.py",
line 721, in integral
return x.integral(*args, **kwds)
File "sage/symbolic/expression.pyx", line 12275, in
sage.symbolic.expression.Expression.integral
(/usr/local/sage-8.0/src/build/cythonized/sage/symbolic/expression.cpp:69945)
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py",
line 795, in integrate
return integrator(expression, v, a, b)
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/external.py",
line 97, in mma_free_integrator
page = page[page.index('"inputForm"'):page.index('"outputForm"')]
ValueError: substring not found
If I try integral(sin(x^2),x,algorithm='sympy') I get:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_20.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("aD1pbnRlZ3JhbChzaW4oeF4yKSx4LGFsZ29yaXRobT0nc3ltcHknKQ=="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpK8eQi1/___code___.py", line 3, in <module>
exec compile(u"h=integral(sin(x**_sage_const_2 ),x,algorithm='sympy')"
+ '\n', '', 'single')
File "", line 1, in <module>
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/misc/functional.py",
line 721, in integral
return x.integral(*args, **kwds)
File "sage/symbolic/expression.pyx", line 12275, in
sage.symbolic.expression.Expression.integral
(/usr/local/sage-8.0/src/build/cythonized/sage/symbolic/expression.cpp:69945)
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py",
line 795, in integrate
return integrator(expression, v, a, b)
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/external.py",
line 56, in sympy_integrator
return result._sage_()
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sympy/core/mul.py",
line 1572, in _sage_
s *= x._sage_()
File
"/usr/local/sage-8.0/local/lib/python2.7/site-packages/sympy/core/function.py",
line 707, in _sage_
func = getattr(sage, fname)
AttributeError: 'module' object has no attribute 'fresnels'
It seems that fresnels is defined in sympy but not in sagemath, Is it
possible to correct these errors? Thanks, Enrique.
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