Possible bug in Table and/or lists (Mathematica v.7)
- To: mathgroup at smc.vnet.net
- Subject: [mg108053] Possible bug in Table and/or lists (Mathematica v.7)
- From: Vijay Kaul <vijaykaul at gmail.com>
- Date: Sun, 7 Mar 2010 04:05:21 -0500 (EST)
I found this potential bug in Mathematica 7, running on Win XP and OS
X and it's easily reproducible.
If I try the following:
dim = 3;
t = Table[1, {2*dim}, {2*dim}];
t // Grid
t[[-dim ;;]] = Table[1, {dim}];
t // Grid
I get unexpected results: the last three rows, rather than being each
a three element list, are, instead, single "1"s. On the other hand
dim = 3;
t = Table[1, {2*dim}, {2*dim}];
t // Grid
t[[-dim ;;]] = Table[1, {dim + 1}];
t // Grid
works as expected.
In general, dimensions where the shorter lists are *not* half the
larger dimension seem to work just fine. I can also reproduce the
problem by creating a list of length 2N and then trying to fill half
of it with lists of length 2N and half with lists of length N.
Maybe I'm missing something, but it baffled me and some others who
looked at it.
Also, I'm not sure where or how to find a Mathematica bug-list, and I
didn't see a FAQ around here, but I'm relatively unexposed to usenet,
newsgroups, and Google groups, so I may have missed some obvious
stuff.
So, with thanks and/or apologies in advance,
-Vijay
- Follow-Ups:
- Re: Possible bug in Table and/or lists (Mathematica v.7)
- From: Leonid Shifrin <lshifr@gmail.com>
- Re: Possible bug in Table and/or lists (Mathematica v.7)