The Deprecation warning was absent in 4.3.3 but is there in 4.6.2. Does
this mean consecutive brackets are treated as Lamda expressions scoping to
the right?
Like:
sage : y=1/((x-1)(x-3)(x-5))
sage : y
1/(x-9)
sage : y=1/((x-1)(x-3)(x^2-5))
sage : y
1/(x^2-9)
sage : y=1/((x-1)(x-3)(x^2-5)(x^3-1))
sage : y
1/((x^3-1)^2-9)
I did not find this mentioned in the docs. May be it is there.
Thanks.
On Sat, Mar 26, 2011 at 12:52 AM, John H Palmieri <jhpalmier...@gmail.com>wrote:
>
>
> On Friday, March 25, 2011 9:35:13 PM UTC-7, Surendran Karippadath wrote:
>>
>> If the multiplication sign * is absent ( say by mistake!) what is SAGE
>> evaluating?
>> For example:
>> x=var('x');f=1/((x-1)(x-3));
>> f.limit(x=1) returns -1/3
>> diff(f,x) returns -1/(x - 4)^2
>> plot(f,(x,0,10)) plots a smooth curve going through -1/3.
>>
>> It is clear it is evaluating f =1/(x-4). How? Why is not pointing to
>> the possible error?
>>
>
> I think it's taking the expression (x-1), treating it as a symbolic
> expression, and plugging in (x-3) for x, thus obtaining (x-3-1) = (x-4).
> Actually, here's what happens when I do this:
>
> sage: x=var('x');f=1/((x-1)(x-3));
> /Applications/sage/local/lib/python2.6/site-packages/IPython/iplib.py:2073:
> DeprecationWarning: Substitution using function-call syntax and unnamed
> arguments is deprecated and will be removed from a future release of Sage;
> you can use named arguments instead, like EXPR(x=..., y=...)
> exec code_obj in self.user_global_ns, self.user_ns
> sage: f
> 1/(x - 4)
>
> If you didn't see the warning, what version of Sage are you using?
>
> --
> John
>
>
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