"contour" can't return a list of contours (it would be nice)
"arrows" has different options from S-PLUS (no "open" or
"rel" options,
no "lwd" parameter or graphics parameter pass-through;
"size" in S
corresponds to "length" in R). [I know we needn't follow S-PLUS
syntax
slavishly, but it would be nice at least to compile a more-or-less
comprehensive list of differences.]
The xaxs option "i" (no extra space around xlim, ylim) isn't
documented
axis() first argument is called "side" (not "which" as in
S: see
comment above)
In lines 5-8 I correct what I think is a bug -- since "cra" (character
size in rasters) doesn't change with "cex", the legend
line-spacing
doesn't change correctly for cex>1.
The other changes, which should definitely be considered optional, adds
the capability I've always wanted in legends -- to be able to mix symbols
and lines in the same legend without having to have a symbol or a line for
every item in the legend, and to be able to put symbols and lines in the
same column (option "merge"). The spacing's not quite perfect,
though.
3c3
< xjust=0, yjust=1, merge=FALSE, ...)
---> xjust=0, yjust=1, ...)
5,8c5,8
< xchar <- xinch(par("cin")[1])*par("cex")
< ychar <- yinch(par("cin")[2])*1.2*par("cex")
< xbox <- xinch(par("cin")[2]*0.8)*par("cex")
< ybox <- yinch(par("cin")[2]*0.8)*par("cex")
---> xchar <- xinch(par("cin")[1])
> ychar <- yinch(par("cin")[2]) * 1.2
> xbox <- xinch(par("cin")[2] * 0.8)
> ybox <- yinch(par("cin")[2] * 0.8)
50c50
< if (!merge) xt <- xt + xbox + xchar
---> xt <- xt + xbox + xchar
52d51
< col _ rep(col,length.out=length(legend))
54,57c53,54
< pch _ rep(pch,length.out=length(legend))
< ok _ (is.character(pch) | pch>0)
< points((xt + 0.25 * xchar)[ok], yt[ok], pch[ok], col=col[ok])
< if (!merge) xt <- xt + 1.5 * xchar
---> points(xt + 0.25 * xchar, yt, pch, col=col)
> xt <- xt + 1.5 * xchar
60,66c57,58
< lty _ rep(lty,length.out=length(legend))
< ok _ (lty>0)
< if (merge) segments((xt-xchar)[ok], yt[ok], (xt + xchar)[ok],
< yt[ok], lty=lty[ok], col=col[ok])
< else segments(xt[ok], yt[ok], (xt + 2 * xchar)[ok],
< yt[ok], lty=lty[ok], col=col[ok])
< if (!merge) xt <- xt + 3 * xchar
---> segments(xt, yt, xt + 2 * xchar, yt, lty=lty, col=col)
> xt <- xt + 3 * xchar
68d59
< if (merge) xt <- xt + 3 * xchar
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