Thats an en dash (– in HTML). It often sneaks in when copy/pasting
equations from PDF.
We could translate en dash into hypen on the commandline to avoid that
surprise...
On Wednesday, April 1, 2015 at 9:05:22 PM UTC+2, John H Palmieri wrote:
>
> 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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