From: Gavin Simpson <gavin.simpson_at_ucl.ac.uk>

Date: Tue, 19 Feb 2008 18:11:04 +0000

Date: Tue, 19 Feb 2008 18:11:04 +0000

On Tue, 2008-02-19 at 09:17 -0800, Stiffler wrote:

> Hello,

*>
**> I was wondering why the plot() command ignores the datatype when displaying
**> axis labels. More specifically, if the data points are integers then the
**> axis labels should intuitively also be integers, right?
**>
**> > x <- as.integer(c(1,2,3))
**> > y <-x
**> > typeof(x)
**> [1] "integer"
**> > plot(x,y)
**> >
**>
**> The axis labels are 1.0, 1.5, 2.0, 2.5, 3.0 but if the integer type were
**> taken into account they would be 1, 2, 3.
*

It is due to pretty() finding nice numbers for the axis

> pretty(x)

[1] 1.0 1.5 2.0 2.5 3.0

*>
*

> PS what's the right way to get integer labels?

Do them by hand, if they are (numeric) integers

*> plot(x,y, axes = FALSE)
**> axis(2)
*

> axis(1, at = x)

*> box()
*

Axis.integer <- function(x = NULL, at = NULL, ..., side, labels = NULL) {

at <- unique(x)

labels <- as.character(at)

axis(side = side, at = unique(x), labels = labels, ...)
}

y2 <- runif(3)

plot(x, y)

plot(x, y2)

But is far from bullet proof and is not guaranteed to work in all situations.

**HTH
**
G

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