RE: Table through zero...strange

• To: mathgroup at smc.vnet.net
• Subject: [mg67032] RE: [mg66988] Table through zero...strange
• From: "David Park" <djmp at earthlink.net>
• Date: Wed, 7 Jun 2006 05:10:16 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```It's those pesky binary computers combined with approximate numbers!

Use an exact calculation and then convert it to approximate numbers (it has
no problem with an exact zero)

Table[x, {x, -1/10, 0, 1/50}]
% // N
{-(1/10), -(2/25), -(3/50), -(1/25), -(1/50), 0}
{-0.1, -0.08, -0.06, -0.04, -0.02, 0.}

or, use the Mathematica Chop function.

Table[x, {x, -0.1, 0, 0.02}] // Chop
{-0.1, -0.08, -0.06, -0.04, -0.02, 0}

David Park

From: leptonic [mailto:leptonic at gmx.ch]
To: mathgroup at smc.vnet.net

Hello,

When i type in Mathematica (version 4) Table[x, {x, -0.1, 0, 0.02}]

it gives me {-0.1, -0.08, -0.06, -0.04, -0.02, -3.46945 x 10-18]}
but for example Table[x, {x, -0.1, 0, 0.05}] will give a reasonable
{-0.1, -0.05, 0.}.

Probably a very stupid question but i can't figure out why the zero
makes problem.

Thanks for any help.

```

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