[R] Eyeball problem ...

[John Logsdon]

Just a point about plotting and abline with a dotted grid.  Try this for
size: 

eh<-function (mx, my, line='dotted') 
{
    x <- c(0, mx)
    y <- c(0, my)
    plot(x, y, "l")
    abline(v = seq(0, mx, 10), h = seq(0, my, 10), lty = line)
}

eh(100,100)
eh(100,1000)
eh(100,5000)
eh(100,10000)

When there are enough horizontal lines, the dotted characteristic makes it
look vertical!  Had me puzzled for a bit.  Try it with line='' as well. 
Actually it is worse with (eg) eh(10000,100) but I was considering your
collective health.

Is there any simple way of returning the axis label values that can be
passed to abline, or enforcing abline to put the grid against these?  This
is what I was actually trying to do when my eyeballs fell out.

\John

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