[R] issue with plot (type="h")

[Manuel Morales]

Hi GaÅ¡per

On Wed, 2006-02-22 at 14:12 +0100, Gasper Cankar wrote:
> Hello everyone.
> 
> For reasons too long to explain I wanted to do plots similar to histograms with plot(type="h"). 
> I ran into a problem - if I set line width too high, histogram isn't accurate anymore.
> 
> For example:
> 
> par(lend=2)
> plot(c(2,4,3,2),ylim=c(0,5), type="h")
> abline(h=3)
> 
> Column 3 appears just as high as it should. But if I do
> 
> par(lend=2)
> plot(c(2,4,3,2),ylim=c(0,5), type="h",lwd=100)
> abline(h=3)
> 
> then columns become too high. Can I correct the problem or is there another way to display my data correctly?

You need to use lend=1 or lend="butt" in your par() statement.

In my view, it would be nice to change the default to use lend=1 for
plot type = h, or at least to include a warning when square is used,
since the effect of increasing the lwd may not always be obvious.