If I copy and paste your code, I also get an error. The reason is that the first symbol you use for subtraction is not a hyphen, but some other symbol which looks very much like a hyphen, but which Sage does not recognize. (The second subtraction symbol seems to be okay.) Try using hyphens instead.
John On Wednesday, April 1, 2015 at 11:19:12 AM UTC-7, CR wrote: > > I've been using sagemath throughout the semester with few problems, but I > just can't seem to figure out what's wrong with my syntax here. > > x = var('x') > > p(x) = x^3 – 3*x^2 + x - 1 > Dp(x) = derivative(p(x), x) > > plot(p(x), -1, 1) > > I'm getting this error: > > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > File "_sage_input_2.py", line 10, in <module> > exec compile(u'open("___code___.py","w").write("# -*- coding: > utf-8 -*-\\n" + > _support_.preparse_worksheet_cell(base64.b64decode("eCA9IHZhcigneCcpCgpwKHgpID0geF4zIOKAkyAzKnheMiArICh4IC0gMSkKRHAoeCkgPSBkZXJpdmF0aXZlKHAoeCksIHgpCgpwbG90KHAoeCksIC0xLCAxKQ=="),globals())+"\\n"); > > execfile(os.path.abspath("___code___.py")) > File "", line 1, in <module> > > File "/tmp/tmpd2XXUV/___code___.py", line 5 > __tmp__=var("x"); p = symbolic_expression(x**_sage_const_3 – > _sage_const_3 *x**_sage_const_2 + (x - _sage_const_1 )).function(x) > ^ > SyntaxError: invalid syntax > > So appears that the function is in error... > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.