Re: [R] How can I brake a label in two lines when using expression()?

Mon, 07 May 2012 07:19:52 -0700 


On May 7, 2012, at 6:20 AM, Beatriz De Francisco wrote:
I making an xyplot and the y label is too long and needs to be in two rows, but when I brake it there is a huge gap between the last text string and the expression, and I can't get rid of it. Any ideas?
My first idea would be that you should learn to post "minimal" examples. Since your question is about how to use plotmath expressions, you could skip all the data of that with:: 

xyplot(1~1) # as the "scaffold".
Your question had nothing to do with that data, and it required that the responder locate the package that had panel.errbars() which you rather carelessly failed to mention. You can keep those second line items together using group() but the arrangement on the page is unsatisfactory since the text newline does not do a linefeed : 

ylab=expression("Mean Reapisration Rate
 "*group("(", umol.*L^-1*.g *"(AFDM)"^-1,")"))


Try using atop():

ylab=expression(atop("Mean Reapisration Rate",
                     "("*mu*mol~L^-1*.g~"("*AFDM*")"^-1*")")
                      )

So this code is my nomination for a minimal solution:

xyplot(1~1, ylab=expression(atop("Mean Reapisration Rate",
                     "("*mu*mol %.% L^-1 %.% g~"("*AFDM*")"^-1*")")
                      ) )
I also took the liberty of changing the "umol" to a proper micro-mol with the use of the Greek mu. I also put in proper "cdots" instead of periods. (So now it meets my personal standards for labeling proprieties.) If you don't use atop(), the registration of the "bottom expression" gets messed up, at least in my attempts. One of the known difficulties with plotmath expressions is the difficulty in getting a proper line break. atop() solves the two line problem but not the three line problem. 

--
David



Data:
structure(list(Temp = c(8L, 8L, 8L, 8L, 8L, 8L, 12L, 12L, 12L,
12L, 12L, 12L), CO2 = c(380L, 380L, 380L, 750L, 750L, 750L, 380L,
380L, 380L, 750L, 750L, 750L), Treat = structure(c(3L, 3L, 3L,
4L, 4L, 4L, 1L, 1L, 1L, 2L, 2L, 2L), .Label = c("12-380", "12-750",
"8-380", "8-750"), class = "factor"), Week = c(1L, 3L, 8L, 1L,
3L, 8L, 1L, 3L, 8L, 1L, 3L, 8L), Mean.Rate = c(2.125909389, 1.905870003, 
1.417687602, 3.110439984, 2.31043989, 1.849232493, 2.546747098,
3.290235064, 3.000717599, 2.694901409, 3.852590547, 2.964084249
), lower = c(1.846641409, 1.44072624, 1.185304427, 2.56408099,
2.02644683, 1.606374443, 2.253928482, 2.759177284, 2.49014747,
2.168437604, 3.075977559, 2.438453415), upper = c(2.405177369,
2.371013766, 1.650070777, 3.656798978, 2.59443295, 2.092090543,
2.839565714, 3.821292844, 3.511287728, 3.221365214, 4.629203535,
3.489715083), fTemp = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 2L,
2L, 2L, 2L, 2L, 2L), .Label = c("8", "12"), class = "factor"),
   fCO2 = structure(c(1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L,
2L, 2L), .Label = c("380", "750"), class = "factor"), fTreat = structure(c(1L, 
   1L, 1L, 2L, 2L, 2L, 3L, 3L, 3L, 4L, 4L, 4L), .Label = c("8-380",
   "8-750", "12-380", "12-750"), class = c("ordered", "factor"
   )), fWeek = structure(c(1L, 2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L,
1L, 2L, 3L), .Label = c("1", "3", "8"), class = "factor")), .Names = c("Temp", 
"CO2", "Treat", "Week", "Mean.Rate", "lower", "upper", "fTemp",
"fCO2", "fTreat", "fWeek"), row.names = c(NA, -12L), class = "data.frame") 

xyplot(cbind(Mean.Rate,lower,upper)~fWeek|fTreat,
      resp.week.mean.rate,
      as.table=TRUE,
      xlab="Week",
      ylab=expression("Mean Reapisration Rate
(umol."*L^-1*".g (AFDM)"^-1*")"),
                        scales=list(alternating=FALSE,
                                    tick.number=10,
                                    tck=c(-1,0)),
      layout=c(4,1),
      ylim=1:5,
      auto.key=list(title="Treatment",
                    lines=TRUE,
                    cex.title=1,
                    columns=2),
      panel=function(x, y,...){
        panel.errbars(x,y,make.grid="none",ewidth=0.2,type="p",...)
panel.loess(x[resp.week.mean.rate $Treat=="8-380"],y[resp.week.mean.rate$Treat=="8-380"],span = 5, degree = 1,lwd=2,...) panel.loess(x[resp.week.mean.rate $Treat=="8-750"],y[resp.week.mean.rate$Treat=="8-750"],span = 5, degree = 1,lwd=2,...); panel.loess(x[resp.week.mean.rate $Treat=="12-380"],y[resp.week.mean.rate$Treat=="12-380"],span = 5, degree = 1,lwd=2,...); panel.loess(x[resp.week.mean.rate $Treat=="12-750"],y[resp.week.mean.rate$Treat=="12-750"],span = 5, degree = 1,lwd=2,...) 
      }
      )

Beatriz de Francisco Mora
PhD Student
The Scottish Association for Marine Science
Scottish Marine Institute
Oban
PA37 1QA
Tel: 06131 559000 (switchboard)
Fax: 01631559001
E. beatriz.defranci...@sams.ac.uk<mailto:beatriz.defranci...@sams.ac.uk > 
http://www.smi.ac.uk/beatriz-de-franciso
The Scottish Association for Marine Science (SAMS) is registered in Scotland as a Company Limited by Guarantee (SC009292) and is a registered charity (9206). SAMS has an actively trading wholly owned subsidiary company: SAMS Research Services Ltd a Limited Company (SC224404). All Companies in the group are registered in Scotland and share a registered office at Scottish Marine Institute, Oban Argyll PA37 1QA. The content of this message may contain personal views which are not the views of SAMS unless specifically stated. Please note that all email traffic is monitored for purposes of security and spam filtering. As such individual emails may be examined in more detail. 

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David Winsemius, MD
West Hartford, CT

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