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MathGroup Archive 2006

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RE: Table command strange output when 'i' over 16

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69816] RE: [mg69779] Table command strange output when 'i' over 16
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sat, 23 Sep 2006 23:45:15 -0400 (EDT)

Nasser,

Basically I don't think it is a correct construction. The different
iterators should have different iterator variables. So digging into why it
doesn't work is probably a wasted effort.

In your case you don't need an iterator variable. You could use...

Table[0, {16}, {16}] // MatrixForm

However, if you evaluate the following statement repeated you will obtain
different results and sometimes the correct one.

Table[0, {i, 1, 16}, {i, 1, 16}] // MatrixForm

But I just don't see a reason to use that construction.

Sometimes you might want to use a construction with an iterator variable in
one iterator and no variable in the second variable.

Table[i, {i, 1, 16}, {16}] // MatrixForm

Table[i, {16}, {i, 1, 16}] // MatrixForm

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

From: Nasser Abbasi [mailto:nma at 12000.org]
To: mathgroup at smc.vnet.net

hello;

Mathematica 5.2, on XP.

When I type the command

Table[0,{i,1,2},{i,1,2}]
Table[0,{i,1,3},{i,1,3}]
Table[0,{i,1,4},{i,1,4}]

etc... all the way to

Table[0,{i,1,15},{i,1,15}]

I always get a 2D square  Matrix filled with zeros as I expected.

But when I type

Table[0,{i,1,16},{i,1,16}]

Now the matrix returned no longer filled with zero.
Any idea why this is? and any other value of over 16 will also have this
problem.

Notice that when I change the second index counter from 'i' to 'j' it works:
Table[0,{i,1,16},{j,1,16}]

it works ok, and I get a matrix filled with zero.

any thoughts?

Here is a screen shot:
http://12000.org/tmp/092106/table_bug.htm

Nasser



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