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...
>
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