Really strange error, a change from (x+2) to (x-2) causes an error? This is Sage 8.0. This worked 2 years ago but broken now.
#This works: var ('x,a') assume(a, 'real') assume (a > 0) Psi = sqrt(a)* exp(-a*(abs(x+2))) integral(Psi^2,x, -oo,oo) (x, a) 1 #This does not work , changed a "+" sign to "-" sign var ('x,a') assume(a, 'real') assume (a > 0) Psi = sqrt(a)* exp(-a*(abs(x-2))) integral(Psi^2,x, -oo,oo) (x, a) Error in lines 5-5 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/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 (/ext/sage/sage-8.0/src/build/cythonized/sage/symbolic/expression.cpp:69945) return integral(self, *args, **kwds) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py", line 799, in integrate return definite_integral(expression, v, a, b, hold=hold) File "sage/symbolic/function.pyx", line 996, in sage.symbolic.function.BuiltinFunction.__call__ (/ext/sage/sage-8.0/src/build/cythonized/sage/symbolic/function.cpp:11397) res = super(BuiltinFunction, self).__call__( File "sage/symbolic/function.pyx", line 486, in sage.symbolic.function.Function.__call__ (/ext/sage/sage-8.0/src/build/cythonized/sage/symbolic/function.cpp:6440) res = g_function_evalv(self._serial, vec, hold) File "sage/symbolic/function.pyx", line 1085, in sage.symbolic.function.BuiltinFunction._evalf_or_eval_ (/ext/sage/sage-8.0/src/build/cythonized/sage/symbolic/function.cpp:12757) return self._eval0_(*args) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py", line 181, in _eval_ return integrator(*args) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/symbolic/integration/external.py", line 34, in maxima_integrator result = maxima.sr_integral(expression, v, a, b) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py", line 805, in sr_integral return max_to_sr(maxima_eval(([max_integrate],[sr_to_max(SR(a)) for a in args]))) 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 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 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 1693, in max_to_sr sage_expr=SR(maxima(expr)) File "sage/structure/parent.pyx", line 934, in sage.structure.parent.Parent.__call__ (/ext/sage/sage-8.0/src/build/cythonized/sage/structure/parent.c:9799) return mor._call_(x) File "sage/structure/coerce_maps.pyx", line 282, in sage.structure.coerce_maps.NamedConvertMap._call_ (/ext/sage/sage-8.0/src/build/cythonized/sage/structure/coerce_maps.c:6299) cdef Element e = method(C) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_abstract.py", line 1257, in _symbolic_ return R(self._sage_()) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/maxima_abstract.py", line 1232, in _sage_ maxima=self.parent()) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/sage/calculus/calculus.py", line 2151, in symbolic_expression_from_maxima_string raise TypeError("unable to make sense of Maxima expression '%s' in Sage"%s) TypeError: unable to make sense of Maxima expression 'if(-(_SAGE_VAR_x-2)>0,(e^-(4*_SAGE_VAR_a)*(e^(2*_SAGE_VAR_a*_SAGE_VAR_x)-2*e^(4*_SAGE_VAR_a)))/(2*_SAGE_VAR_a),-e^(4*_SAGE_VAR_a-2*_SAGE_VAR_a*_SAGE_VAR_x)/(2*_SAGE_VAR_a))' in Sage -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.