William asked me to post a copy of an off-line discussion to
this list. Here it is:
Since I still haven't gotten around to learning SAGE, I am
operating from a purely R-centric perspective here.
In particular I haven't a clue how R interfaces with SAGE. For
example, setting plot parameters via "par(ann=0)" would be persistent
in an R session, ie you wouldn't have to repeat this with every
subsequent plot. When calling R from SAGE is there an R session that
persists until it is killed explicitly or by exiting SAGE?
In R I usually make the plot first, then copy to ps,png,or pdf with
dev.copy. I infer from the duscussion below that one doesn't see the
plot directly in an R graphics window, but it is copied into the SAGE
cell, whatever that is. [I assume the "os.curdir+'/out.ps'" is
directing it to the SAGE cell?]
Would it be helpful to have the R graphics window, allowing use of
interactive graphical functions like locator() and identify(),
plus the ability to construct a graph in steps and make additions
before copying?
For example, (just making stuff up :-)
r.X11()
r.par(ann=0)
values = [x for x in srange(0,float(pi),.1)]
r.plot(values, [sin(x) for x in values], type='lines',lty=1, col="blue")
r.lines(values, [cos(x) for x in values],col="red",lty=2)
r.legend(locator(1),legend=c("sin","cos"),lty=c(1,2),col=c("blue","red"))
r.dev.copy(postscript,os.curdir+'/out.ps')
r.dev_off()
albyn
On Thu, Jan 24, 2008 at 02:40:26PM -0500, David Perkinson wrote:
> ----- Forwarded message from William Stein <[EMAIL PROTECTED]> -----
>
> Date: Thu, 24 Jan 2008 11:38:40 -0800
> From: William Stein <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED], [EMAIL PROTECTED]
> Subject: [sage-newbie] Re: [sage-devel] Re: R and rpy
>
>
> On Jan 24, 2008 9:24 AM, mhampton <[EMAIL PROTECTED]> wrote:
> >
> > OK I think I have learned a little. The following code seems to flush
> > the output properly, and sends it to the current cell.
> >
> > r.postscript(os.curdir+'/out.ps')
> > r.par(ann=0)
> > values = [x for x in srange(0,float(pi),.1)]
> > r.plot(values, [sin(x) for x in values], type='lines')
> > r.dev_off()
> >
>
> Cool. The following slight variant plots perfectly in any cell, etc.,
> and doesn't
> display any funny cruft:
>
> from rpy import r
> r.png(os.curdir+'/sage.png')
> r.par(ann=0)
> values = [x for x in srange(0,float(pi),.1)]
> r.plot(values, [cos(x^2) for x in values], type='l')
> _ = r.dev_off()
>
> Now somebody needs to start on the "nice usage of R from Sage" package for
> Sage, which will have a plot wrapper, etc., etc., This would likely go in
> *the*
> already existing directory
>
> SAGE_ROOT/devel/sage/sage/stats/
>
> In fact, it would be best if like with symbolic calculus we view this
> as a general
> package for doing statistics, which just happens to built almost entirely on
> R.
> But we could also provide hooks into some of the very formidable (or
> not?) statistics
> capabilities of SciPy.
>
> -- William
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