[R] barplot with log base 2 scale or shift the x-axis

[Uwe Ligges]

I'd rescale my data to minimum around 0 and use some separate axis() 
that takes the rescaling into account - given there is no package that 
already does it. ;-)

Uwe Ligges



Summer Nitely wrote:
> Hi,
> I have data that is on a log base 2 scale.  It goes from negative factors of
> 2 to positive ones.  I am using barplot.  However, I don't want the data
> centered at 0 - I want the min of the yaxis to be just below the lowest
> value in the data. The plots are kind of deceptive switching between
> positive and negative.  I see that barplot has a log option, but that
> doesn't seem to be adjustable for a log base 2 scale.  Does anyone know how
> to adjust the x-axis, so it's at y= -value rather than at y=0?  I''d rather
> not add a factor to the data, unless I can have accurate labels on the
> y-axis.
> Any ideas?
> Thanks,
> Summer
> 
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