Hello everybody!
Thanks for your help.
I'm realizing that i'm definitely really bad in sage, perhaps i'll be
best in another life!!lol!
This is a piece of a code for changing a symbolic mathematica list
expression to a sage list expression:
def mmatosage(mma_list):
# Convert the mathematica object to a string
string = repr(mma_list)
# Convert mathematica-style {} to python style []
string = string.replace('{','[').replace('}',']')
# Replace mathematica's crazy exponent notation with the standard
one
string = string.replace('^', '**')
# Delete new lines (both \n and \r\n appear sporadically)
string = string.replace('\n', ' ').replace('\r', ' ')
sage_stuff = sage_eval(string,locals =
{'E':'E','x':'x','y':'y'},preparse=False,)
return sage_stuff
I get the folowing error when I apply it to this mathematica
expression {((1 + E^x^2)*x)/(1 + E^x^2 + 2*E^x^2*x^2),
((-1 + E^y^2)*y)/(-1 + E^y^2 + 2*E^y^2*y^2)}
---> 41 sage_stuff = sage_eval(string,locals =
{'E':'E','x':'x','y':'y'},preparse=False)
42 return sage_stuff
/usr/local/src/sage-4.0.2/local/lib/python2.5/site-packages/sage/misc/
sage_eval.pyc in sage_eval(source, locals, cmds, preparse)
197 return locals['_sage_eval_returnval_']
198 else:
--> 199 return eval(source, sage.all.__dict__, locals)
200
201
/usr/local/src/sage-4.0.2/local/lib/python2.5/site-packages/sage/
all.pyc in <module>()
TypeError: unsupported operand type(s) for ** or pow(): 'str' and
'int'
I have any idea.
Thankx for your help!
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