[R] A faster plotOHLC() for the tseries package

[Dirk Eddelbuettel]

Hi Gabor,

On Sun, Dec 14, 2003 at 02:35:40PM -0500, Gabor Grothendieck wrote:
> 
> Dirk,
> 
> Could you please explain to me how to interpret the lines
> that you posted (which I gather are intended to be used with
> some program that combines them with the original source)?

That is the usual paradigm of using output of diff(1) 

 $ diff -u old new > diff.txt
     
as input to the patch(1) program as e.g. in

 $ patch < diff.txt        # try patch --dry-run < diff.txt   first
   
On win2k, you can get them for sure with Cygwin, probably also with
mingw/msys and likely also with BDR's set of tools to build R from source.
     
Patch, written by Larry Wall of Perl fame, reads an entry such as

  > --- plotOHLC.R.orig     2003-12-14 12:02:20.000000000 -0600
  > +++ plotOHLC.R     2003-12-14 12:03:42.000000000 -0600
  > @@ -21,14 +21,9 @@

and knows to replace lines marked with '-' (taken be old the old file) with
those marked '+'.  In this example, it is trivial as there is only one
segment in which the code 

 for (i in 1:NROW(x)) {
     segments(time.x[i], x[i, "High"], time.x[i], x[i, "Low"], 
         col = col[1], bg = bg)
     segments(time.x[i] - dt, x[i, "Open"], time.x[i], x[i, 
         "Open"], col = col[1], bg = bg)
     segments(time.x[i], x[i, "Close"], time.x[i] + dt, x[i, 
         "Close"], col = col[1], bg = bg)
 }

with 

 segments(time.x, x[, "High"], time.x, x[, "Low"], col = col[1], bg = bg)
 segments(time.x - dt, x[, "Open"], time.x, x[, "Open"], col = col[1], bg = bg)
 segments(time.x, x[, "Close"], time.x + dt, x[, "Close"], col = col[1], bg = bg)
     
> Alternately, could you just send the revised OHLC source?

Well, the source is different from what you find in $R_HOME/library/tseries/R
so you may as well edit there by hand. I don't have access to a windows box
right now, but if the above doesn't help email off-line and I start up the
laptop from work.

Hope this helps,  Dirk

-- 
Those are my principles, and if you don't like them... well, I have others.
                                                -- Groucho Marx