Bill Allombert on Fri, 27 Jun 2003 11:35:48 +0200

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Re: Minor points

On Fri, Jun 27, 2003 at 10:01:34AM +0100, Jon Perry wrote:
> 1) Why is:
> a(n++)=n^2
> not allowed (as opposed to a(n)=n++;n^2)?

n++ is not a valid formal parameter.
If I were crazy enough to define a(n++)=n^2, this would be an alias
for a(n)=n--;n^2 instead!

How do you define C[X++] the polynomials in the X++ indeterminate ?

> 2) How about a vector0 function which defines v[0] so that sequences with a
> zero offset can be correctly aligned within the vector.

PARI vectors start at 1. You cannot have a function that return 
a vector starting at 0 since this is not a valid PARI object.