# [R] splom, plotmath: how to add three lines of information with alignment?

Tue Apr 19 23:04:13 CEST 2011

```Hi,

This is always a challenge with expressions vs calls, etc. grid.table
expects an input that can be coerced into a matrix of unevaluated
expressions. This seems to work,

info <- function(a,b){
grid.table(c(bquote(alpha==.(a)), bquote(beta==.(b))),
parse=TRUE, # parse labels as expressions
theme=theme.list(
gpar.corefill=gpar(fill=NA, col=NA), # make bg transparent
core.just="left") # justification of labels
)
}
xyplot(1~1, panel=function(...) info(0.1, 0.5) )

HTH,

baptiste

On 20 April 2011 07:52, Marius Hofert <m_hofert at web.de> wrote:
> Dear guys,
>
> I'm almost there... how can I fix the final problems?
>
> Cheers,
>
> Marius
>
> PS: the "info" function is the one I will then try to call within splom...
>
> library(lattice)
> library(gridExtra)
>
> ## trial 1
> info <- function(a,b){
>    grid.table(as.expression(substitute(expression(alpha==alph, beta==bet),
>        list(alph=a, bet=b))),
>               parse=TRUE, # parse labels as expressions
>               theme=theme.list(
>               gpar.corefill=gpar(fill=NA, col=NA), # make bg transparent
>               core.just="left") # justification of labels
>               )
> }
> xyplot(1~1, panel=function(...) info(0.1, 0.5) )
>
> ## trial 2
> info <- function(a,b){
>    grid.table(substitute(expression(alpha==alph, beta==bet),
>        list(alph=a, bet=b)),
>               parse=TRUE, # parse labels as expressions
>               theme=theme.list(
>               gpar.corefill=gpar(fill=NA, col=NA), # make bg transparent
>               core.just="left") # justification of labels
>               )
> }
> xyplot(1~1, panel=function(...) info(0.1, 0.5) )
>
>
>
> On 2011-04-19, at 21:39 , David Winsemius wrote:
>
>>
>> On Apr 19, 2011, at 3:26 PM, baptiste auguie wrote:
>>
>>> I'm hoping to release a new version on CRAN soon; the broken state of
>>> R-forge and my poor understanding of R CMD CHECK results have often
>>> made me postpone action indefinitely.
>>
>> In this case the errors were all mine. I suppose an even earlier stage newbie than I might have problems not knowing that binary packages were not available on r-forge or in recognizing (eventually) that loaded old packages might prevent new versions from loading. Figuring out how to clear one package from all the various places they can reside is beyond my pay grade, so I just restart. Someone should write a flush.package function :-)
>>
>> --
>> david.
>>
>>>
>>> Best,
>>>
>>> baptiste
>>>
>>> On 19 April 2011 22:32, David Winsemius <dwinsemius at comcast.net> wrote:
>>>> I attempted , mostly with success to install following the directions in
>>>> r-forge webpage.
>>>>
>>>> I did add type="source", since generally r-forge does not have compiled
>>>> binaries and I did need to do it twice since I did not have `brew` installed
>>>> under 2.13.0(beta). The loading of help seemed to be a problem which I
>>>> initially assumed to be due to my being on a Mac running R 2.13.0(beta).
>>>> When issuing ?gridExtra I get a help page that says: Error in fetch(key) :
>>>> internal error -3 in R_decompress1
>>>>
>>>> (I did not expect to ?gridExtra to work since I generally use
>>>> help(package=gridExtra) for packages, but when i do that I get:
>>>>> help(package=gridExtra)
>>>> Error in formatDL(nm, txt, indent = max(nchar(nm, "w")) + 3) :
>>>> incorrect values of 'indent' and 'width'
>>>>
>>>> Then I realized I was loading a new package on top of an old loaded package
>>>> so I restarted R and none of the help errors returned.
>>>>
>>>> Nice text table. Should make this task a lot easier that the strategy I was
>>>> about to suggest of doing some sort of superpose of multiple panel.text
>>>> calls.
>>>>
>>>> --
>>>> David
>>>>
>>>>
>>>> On Apr 19, 2011, at 1:19 AM, baptiste auguie wrote:
>>>>
>>>>> On 19 April 2011 17:06, Marius Hofert <m_hofert at web.de> wrote:
>>>>>>
>>>>>> Dear Baptiste,
>>>>>>
>>>>>> Unfortunately, I get the error "Error using packet 1 invalid 'times'
>>>>>> argument" when executing your code. Hmm... not sure where the problem is.
>>>>>>
>>>>>
>>>>> Oops, – sorry, my mistake. For this code to work you'll need a more
>>>>> recent version of gridExtra than the one on CRAN. You can get it here:
>>>>>
>>>>> baptiste
>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Marius
>>>>>>
>>>>>> On 2011-04-19, at 24:03 , baptiste auguie wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> Does this help?
>>>>>>>
>>>>>>> library(gridExtra)
>>>>>>>
>>>>>>> my.title = function(expressions) {
>>>>>>> grid.table(expressions, parse=TRUE,
>>>>>>>           theme=theme.list(gpar.corefill = gpar(fill = NA, col = NA),
>>>>>>>             core.just = "left"))
>>>>>>> }
>>>>>>>
>>>>>>> e = expression(alpha,"text", italic(italic),
>>>>>>>  hat(beta), integral(f(x)*dx, a, b))
>>>>>>>
>>>>>>> library(lattice)
>>>>>>>
>>>>>>> xyplot(1~1, panel=function(...) my.title(e) )
>>>>>>>
>>>>>>> HTH,
>>>>>>>
>>>>>>> baptiste
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 19 April 2011 08:43, Marius Hofert <m_hofert at web.de> wrote:
>>>>>>>>
>>>>>>>> Dear expeRts,
>>>>>>>>
>>>>>>>> I would like to create a scatter plot matrix with splom(). The lower
>>>>>>>> panel should
>>>>>>>> upper panel
>>>>>>>> plot, see the splom() call below. Now two questions came up:
>>>>>>>> (1) The lower panels show "tau" and "alpha" on top of each other. How
>>>>>>>> can I plot
>>>>>>>> *three* expressions on top of each other? I tried several approaches
>>>>>>>> (see the trials below),
>>>>>>>> but couldn't manage to get this to work properly.
>>>>>>>> (2) Is there the possibility to plot the two/three lines (containing
>>>>>>>> "tau = ..", "alpha = ..")
>>>>>>>> aligend according to the equality sign?
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>> Marius
>>>>>>>>
>>>>>>>>
>>>>>>>> library(lattice)
>>>>>>>>
>>>>>>>> f <- function(i,j) i+j
>>>>>>>>
>>>>>>>> U <- matrix(runif(3000), ncol=3)
>>>>>>>>
>>>>>>>> splom(U,
>>>>>>>>    superpanel=function(z, ...){
>>>>>>>>        tau <- cor(U, method="kendall")
>>>>>>>>        df=data.frame(rows=as.vector(row(tau)),
>>>>>>>> columns=as.vector(col(tau)),
>>>>>>>>        vals=as.vector(tau)) # data frame of row indices, column
>>>>>>>> indices, and tau values
>>>>>>>>        df=subset(df,columns<rows) # subset for lower left triangle
>>>>>>>>        with(df,{
>>>>>>>>            panel.text(x=rows, y=columns,
>>>>>>>>
>>>>>>>> labels=as.expression(unlist(lapply(1:length(vals),
>>>>>>>>                           function(i)
>>>>>>>> substitute(atop(tau==tau.,alpha==alpha.),
>>>>>>>>                                                  list(tau.=vals[i],
>>>>>>>> alpha.=round(vals[i],3)) ) ))) )
>>>>>>>>        })
>>>>>>>>        panel.pairs(z, upper.panel=panel.splom,
>>>>>>>> lower.panel=function(...){}, ...)
>>>>>>>>    })
>>>>>>>>
>>>>>>>> ## some minimal "trial" examples:
>>>>>>>> plot(0,0,main=paste("alpha=1","\n","beta=2","\n","gamma=3",sep=""))
>>>>>>>> plot(0,0,main=expression(atop(atop(alpha==1, beta==2), gamma==3)))
>>>>>>>> plot(0,0,main=paste(expression(alpha==1),"\n",expression(beta==2),"\n",
>>>>>>>>       expression(gamma==3), sep=""))
>>>>>>>> plot(0,0,main=substitute(paste(alpha==1,x,beta==2,x,
>>>>>>>>       gamma==3, sep=""), list(x="\n")))
>>>>>>>> plot(0,0,main=expression(cat(alpha==1, "\n", beta==2, "\n", gamma==3,
>>>>>>>> sep="")))
>>>>>>>> plot(0,0,main=cat(expression(alpha==1), "\n", expression(beta==2),
>>>>>>>> "\n",
>>>>>>>>       expression(gamma==3), sep=""))
>>>>>>>>
>>>>>>>> ______________________________________________
>>>>>>>> R-help at r-project.org mailing list
>>>>>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>>>>>> http://www.R-project.org/posting-guide.html
>>>>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> ______________________________________________
>>>>> R-help at r-project.org mailing list
>>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>>> http://www.R-project.org/posting-guide.html
>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>> David Winsemius, MD
>>>> West Hartford, CT
>>>>
>>>>
>>
>> David Winsemius, MD
>> West Hartford, CT
>>
>
>

```