R devel - Jul 2008 - plot.dendrogram xlim/ylim

list(...),

I would like to zoom in to the leaves of large trees in a dendrogram
plot. The playwith package allows zooming by passing xlim and ylim
arguments to the plot call (Hmisc does this too I think). But
currently stats:::plot.dendrogram does not accept xlim or ylim. So I
would like to enable that. In place of the existing code chunk:

    xlim <- c(x1 - 1/2, x2 + 1/2)
    ylim <- c(0, yTop)
    if (horiz) {
        xl <- xlim
        xlim <- rev(ylim)
        ylim <- xl
        tmp <- xaxt
        xaxt <- yaxt
        yaxt <- tmp
    }
    plot(0, xlim = xlim, ylim = ylim, ......

I propose something like:

function(..., xlim, ylim)

    xlim0 <- c(x1 - 1/2, x2 + 1/2)
    ylim0 <- c(0, yTop)
    if (horiz) {
        xl <- xlim0
        xlim0 <- rev(ylim0)
        ylim <- xl
        tmp <- xaxt
        xaxt <- yaxt
        yaxt <- tmp
    }
    if (missing(xlim)) xlim <- xlim0
    if (missing(ylim)) ylim <- ylim0
    plot(0, xlim = xlim, ylim = ylim, ......


Regards,
Felix

-- 
Felix Andrews / ???
PhD candidate
Integrated Catchment Assessment and Management Centre
The Fenner School of Environment and Society
The Australian National University (Building 48A), ACT 0200
Beijing Bag, Locked Bag 40, Kingston ACT 2604
http://www.neurofractal.org/felix/
3358 543D AAC6 22C2 D336 80D9 360B 72DD 3E4C F5D8

>>>>> "FA" == Felix Andrews <felix at nfrac.org>
>>>>>     on Thu, 24 Jul 2008 13:16:22 +1000 writes:
    FA> list(...), I would like to zoom in to the leaves of
    FA> large trees in a dendrogram plot. The playwith package
    FA> allows zooming by passing xlim and ylim arguments to the
    FA> plot call (Hmisc does this too I think). But currently
    FA> stats:::plot.dendrogram does not accept xlim or ylim. So
    FA> I would like to enable that. In place of the existing
    FA> code chunk:

  >>     xlim <- c(x1 - 1/2, x2 + 1/2)
  >>     ylim <- c(0, yTop)
  >>     if (horiz) {
  >>         xl <- xlim
  >>         xlim <- rev(ylim)
  >>         ylim <- xl
  >>         tmp <- xaxt
  >>         xaxt <- yaxt
  >>         yaxt <- tmp
  >>     }
  >>     plot(0, xlim = xlim, ylim = ylim, ......
  >> 
  >> I propose something like:
  >> 
  >> function(..., xlim, ylim)
  >> 
  >>     xlim0 <- c(x1 - 1/2, x2 + 1/2)
  >>     ylim0 <- c(0, yTop)
  >>     if (horiz) {
  >>         xl <- xlim0
  >>         xlim0 <- rev(ylim0)
  >>         ylim <- xl
  >>         tmp <- xaxt
  >>         xaxt <- yaxt
  >>         yaxt <- tmp
  >>     }
  >>     if (missing(xlim)) xlim <- xlim0
  >>     if (missing(ylim)) ylim <- ylim0
  >>     plot(0, xlim = xlim, ylim = ylim, ......

Thank you for the suggestion!
Yes, "something like" this will be part of R 2.8.0
(or 'R-devel' as from tomorrow).

Martin Maechler, ETH Zurich
>>  -- 
>>  Felix Andrews / ???
>>  PhD candidate
>>  Integrated Catchment Assessment and Management Centre
>>  The Fenner School of Environment and Society
>>  The Australian National University (Building 48A), ACT 0200
>>  Beijing Bag, Locked Bag 40, Kingston ACT 2604
>>  http://www.neurofractal.org/felix/
>>  3358 543D AAC6 22C2 D336 80D9 360B 72DD 3E4C F5D8