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


Hi,
On way is;

l = {{1, 2}, {3, 4}, {5, 6}}
MapIndexed[{#[[1]], -1.0*#[[2]]} &, l]

Yas


On Thu, 13 Oct 2005, sherifffruitfly at gmail.com wrote:

> 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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