[R] `its' questions
edd at debian.org
Fri Aug 27 13:51:58 CEST 2004
On Fri, Aug 27, 2004 at 04:08:40PM +0530, Ajay Shah wrote:
> Problem 1: Often, when I'm dealing with its, str() breaks. Here's a
> bug demo. The first statements work fine --
> Problem 2: I try to write an its out and read it back in, but the two
> don't seem to be conformable for matrix subtraction.
Those two seem like genuine its bugs to me.
> Problem 3: How would I convert an its object into an ordinary
> numerical matrix or data frame? I have succeeded with statements
Use itsAsDf <- core(itsObject) to turn 'itsObject' into a data.frame,
as.matrix and friends take it from there.
> Problem 4: I tried to do plot() and then lines() but that does not
> seem to work. How does one superpose multiple curves on one picture,
> where each of them is an its object?
The par(new=TRUE) command allows you do that generically. I.e. to add a second
object to a plot, and have it use the right axis, this works
plot(Data) # plot something, sets up plot, axes, ...
par(new=TRUE) # tell R we need more
plot(moreData, axes=FALSE) # plot more, don't overplot x axis
axis(4) # add 2nd y-axis on right
Those are my principles, and if you don't like them... well, I have others.
-- Groucho Marx
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