Hello John,
The correct syntax for this in R is:
axis(1, at=1:5, labels=expression(1^10, 2^10, 3^10, 4^10, 5^10))
Note that expression() expects actual R syntax and not strings. To
handle strings you would need to do
axis(1, at=1:5, labels=parse(text=c("1^10", "2^10", "3^10", "4^10",
"5^10")))
The best way to accomplish this task using RPy is to write a little R
wrapper function and call that from RPy:
myAxis = r("function(side, pos, labels) axis(side, at=pos,
labels=parse(text=c(labels)))")
So that you get something like:
from rpy import r
r.plot( [1,2,3,4,5], xaxt="n" )
myAxis = r("function(side, pos, labels) axis(side, at=pos,
labels=parse(text=c(labels)))")
myAxis( side=1, pos=[1,2,3,4,5], labels=["1^10", "2^10",
"3^10",
"4^10", "5^10"] )
-Greg
On May 16, 2007, at 2:17AM , John Owens wrote:
> I'm trying to use "expression" to set axis labels
> (so I can get superscripts, 2^10 for instance).
>
> I think the right nomenclature in R is
>
> expression("2^10", "2^11", ...)
>
> (i.e. r.axis(1, labels=expression(...)))
>
> but I have not been able to get it to work under
> rpy. Any example of how to get the mathplot()-like
> functionality working with expression to typeset
> more complex text would be really appreciated!
>
> Thanks -
>
> JDO
>
>
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