[R] Automatic adjustment of axis ranges

[Jim Lemon]

I had a look at this, and worked out most of a function to do it. There 
are three things I haven't been able to figure out, however.

1) Getting the last N lines of the command history into a vector of 
strings. I thought something like:

last.commands<-history(N)

would work, but no go. There doesn't seem to be a file that I can tail, 
either.

2) Finding continuation lines by parenthesis matching. I thought this 
would be easy, but split() doesn't seem to do what the help file says, viz.
"...in particular if split has length 0, x is split into single 
characters." Trying the following:

split("abc","")

I get:

[[1]]
[1] "abc"

not:

[1] "a" "b" "c"

3) Once I have the last plot command as a string, suitably modified, 
getting it to run.

Any suggestions?

Jim
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