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Apply function to parts of a list


Hi all,

Very often, I find myself having datas to plot of this form :

data={{x1,y1},{x2,y2},{x3,y3}...{xn,yn}}

So, very conventional : a list of abscissa and ordinate. Now, let's say I want to multiply by 2 all my ascissa. Right now, I write :

MapAt[2*#&,data,Table[{i,1},{i,1,Length[data]}]]

It's OK but I isn't there another way to achieve this as I find this rather "involved" for such a simple thing ?

Thanks in advance.


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