On Tue, Aug 18, 2009 at 9:56 PM, rjf<fate...@gmail.com> wrote:
>
> Let's see, in sage then you have the following syntax.
> (x,y) means a list
> f(x,y) means a function application
> (x+y) means grouping for arithmetic.
> RationalField(x) means, uh, sortof "in indeterminate..."
> Integer(4) means, uh, set the type? force a coercion?
>
> Are there any other distinct uses of ()?
>
> Mathematica uses
> {} for lists
> [] for function arguments (in SMP these were called projections)
> () for grouping
>
> Maxima uses
> (a,b,c) as meaning something like begin a; b; c end
> [] for lists and array subscripting
> () for grouping and function calls.
>
> So it seems that you have a choice.
>
>
> However, the Sage choice is kind of confusing.
> x //a variable
> (x ) // a list of one item or a group consisting of x alone, hence x.
> ((x)) // a list of one item, grouped alone. Or a list of a list of
> one item. Or just x.
>
> That is, if (a+1,a+2) is a list of 2 items, is (a+1) not a list of
> one item?
yeah, (x) is the same as x, use (x, ) to have a tuple of one element "x".
Ondrej
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