Re: How to reverse sign on the y's in a list of (x, y)'s?

• To: mathgroup at smc.vnet.net
• Subject: [mg61257] Re: [mg61231] How to reverse sign on the y's in a list of (x, y)'s?
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Fri, 14 Oct 2005 05:53:48 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```data=Table[{Random[],Random[]},{3}]

{{0.5566055767951565, 0.11695563345151412},
{0.5886363424084826, 0.7475217203750398},
{0.7924491804881474, 0.03645907331756618}}

{1,-1}#&/@data

{{0.5566055767951565, -0.11695563345151412},
{0.5886363424084826, -0.7475217203750398},
{0.7924491804881474, -0.03645907331756618}}

Bob Hanlon

>
> From: sherifffruitfly at gmail.com
To: mathgroup at smc.vnet.net
> Date: 2005/10/13 Thu AM 01:39:38 EDT
> Subject: [mg61257] [mg61231] How to reverse sign on the y's in a list of (x, y)'s?
>
> Hi all,
>
> This is really dumb, but I just don't know how to do it...
>
> Import from excel gives me a list of ordered pairs, and I want the 2nd
> element of each pair to be of opposite sign. Sticking the negative sign
> in front of the entire Import statement reverses both the 1st and the
> 2nd elements (duh). How do I get just the second item to reverse sign?
>
> thanks!
>
>

```

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