Confirmed, this is now http://trac.sagemath.org/13773
On Tuesday, November 27, 2012 7:12:56 PM UTC, Alan wrote:
>
> my first attempt at using the online version was to move from polar to
> cartesian coods. I tried
>
> var('r theta psi x y z')
> (r,theta,psi,x,y,z)
> e1 = r == +sqrt(x^2+y^2+z^2)
> e2 = theta == arccos(z/sqrt(x^2+y^2+z^2))
> e3 = psi == arctan(y/x)
> solve([e1,e2,e3],x,y,z)
>
> with the result
>
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_53.py", line 10, in <module>
> exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
> -*-\\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("dmFyKCdyIHRoZXRhIHBzaSB4IHkgeicpCihyLHRoZXRhLHBzaSx4LHkseikKZTEgPSByID09ICtzcXJ0KHheMit5XjIrel4yKQplMiA9IHRoZXRhID09IGFyY2Nvcyh6L3NxcnQoeF4yK3leMit6XjIpKQplMyA9IHBzaSA9PSBhcmN0YW4oeS94KQpzb2x2ZShbZTEsZTIsZTNdLHgseSx6KQ=="),globals())+"\\n");
>
> execfile(os.path.abspath("___code___.py"))
> File "", line 1, in <module>
>
> File "/tmp/tmpCMmv9N/___code___.py", line 8, in <module>
> exec compile(u'solve([e1,e2,e3],x,y,z)
> File "", line 1, in <module>
>
> File
> "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/symbolic/relation.py",
>
> line 753, in solve
> sol_list = string_to_list_of_solutions(repr(s))
> File
> "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/symbolic/relation.py",
>
> line 457, in string_to_list_of_solutions
> v = symbolic_expression_from_maxima_string(s, equals_sub=True)
> File
> "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/calculus/calculus.py",
>
> line 1791, 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(and(-pi/2<parg(-r),-pi/2<parg(r),parg(-r)<==pi/2,parg(r)<==pi/2,-r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))!=0,sqrt(r^2*(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))+r^2*cos(theta)^2+tan(psi)^2*r^2*(1-cos(theta))*(cos(theta)+1)/(tan(psi)^2+1))!=0),[x==-r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1)),y==-tan(psi)*r*sqrt(1-cos(theta))*sqrt(cos(theta)+1)/sqrt(tan(psi)^2+1),z==-r*cos(theta)],union()),If(and(-pi/2<parg(-r),-pi/2<parg(r),parg(-r)<==pi/2,parg(r)<==pi/2,r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))!=0,sqrt(r^2*(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))+r^2*cos(theta)^2+tan(psi)^2*r^2*(1-cos(theta))*(cos(theta)+1)/(tan(psi)^2+1))!=0),[x==r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1)),y==tan(psi)*r*sqrt(1-cos(theta))*sqrt(cos(theta)+1)/sqrt(tan(psi)^2+1),z==-r*cos(theta)],union()),If(and(-pi/2<parg(r),parg(r)<==pi/2,-r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))!=0,sqrt(r^2*(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))+r^2*cos(theta)^2+tan(psi)^2*r^2*(1-cos(theta))*(cos(theta)+1)/(tan(psi)^2+1))!=0),[x==-r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1)),y==-tan(psi)*r*sqrt(1-cos(theta))*sqrt(cos(theta)+1)/sqrt(tan(psi)^2+1),z==r*cos(theta)],union()),If(and(-pi/2<parg(r),parg(r)<==pi/2,r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))!=0,sqrt(r^2*(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1))+r^2*cos(theta)^2+tan(psi)^2*r^2*(1-cos(theta))*(cos(theta)+1)/(tan(psi)^2+1))!=0),[x==r*sqrt(1/(tan(psi)^2+1)-cos(theta)^2/(tan(psi)^2+1)),y==tan(psi)*r*sqrt(1-cos(theta))*sqrt(cos(theta)+1)/sqrt(tan(psi)^2+1),z==r*cos(theta)],union())]'
>
> in Sage
>
>
> It seems to be objecting to "in Sage" in the return value from Maxima
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