Re: Weird Print Result
- To: mathgroup at smc.vnet.net
- Subject: [mg74153] Re: Weird Print Result
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Mon, 12 Mar 2007 22:12:58 -0500 (EST)
- Organization: Uni Leipzig
- References: <et36rq$qgu$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
the result of Print[] is Null -- this mean
that Print[] return nothing (but all functions
in Mathematica must return something) and so
it return Null, since X[[1]] is a sum, i.e. Head[X[[1]]]===Plus,
you replace every term in the sum by Null and you have
Null+Null+Null+Null
and this is 4*Null
Regards
Jens
Bruce Colletti wrote:
> Re Mathematica 5.2 under WinXP.
>
> The code below creates the correct output, except for a strange concluding "4 Null."
>
> What does this weird last line of output mean (list length?), why does it print, and how can it be suppressed?
>
> Thankx.
>
> Bruce
>
>
> n = 2;
> T = Array[p, {n, n}];
> X0 = Array[x, {n}];
> X = (Expand /@ (X0.MatrixPower[T, 2]));
> Print /@ X[[1]]
>