Removing "layers"

[Brandon Farr]

I'm curious if one is able to remove layers from a ggplot object. My
case is as follows. I have done an awful lot of automated plot
creation, and have saved all ggplot objects to RData files. Later on,
I can revisit the plots and utilize the fact that the object is self
contained. My question is, can I remove a layer? Specifically in the
automated process I used levels of factor "a" to specify "linetype",
but would like to go back and facet based on factor "a" and have a
single "linetype". Is this possible?

Thanks,
Brandon

[hadley wickham]

Hi Brandon,

It's not really possible (although you can dig around in p$layers and
do it yourself) - I have thought about it, but haven't figured out the
right interface yet.

Hadley

--
http://had.co.nz/

[Brandon Farr]

Hadley,

As always, thanks for the quick reply. As often happens, after posting
question digging around becomes much more fruitful. I determined that
if I call:

p$layers[[i]] <- NULL

I can remove the un-needed layer, and can then start to rebuild. Not a
process I would want to automate, as it isn't clear without inspection
what each layer does, but this works for custom charting.

Thanks for such a great package,
Brandon

On Mar 27, 1:18 pm, hadley wickham <h.wick...@gmail.com> wrote:
> Hi Brandon,
>
> It's not really possible (although you can dig around in p$layers and
> do it yourself) - I have thought about it, but haven't figured out the
> right interface yet.
>
> Hadley
>