Help on creating custom financial time series graphs

Thu, May 9, 2002 8:15 AM

Hmmm,

Not quite the response I was hoping for ;0(

I chose R because of the cross platform capability. But I think it will be 
too difficult to re-write my functions in R.

Basically, the porting from Win32 GDI API won't be to GraphApp will not be 
too difficult if any one can help with one of the ff:

1. GraphApp to Win32 GDI func mapping (this would REALLY help)
2. A way to access the handle to a Graph Window (is this a HWND struct ?)
3. How to write an R extension (I hear this is unnecessarily difficult to 
implement) that draws to the screen

Any help will be appreciated

MAny Thanks

From: Don MacQueen <macq at llnl.gov>
To: "Neil Osborne" <r_stuff_online at hotmail.com>, r-help at stat.math.ethz.ch
Subject: Re: [R] Help on creating custom financial time series graphs
Date: Thu, 9 May 2002 07:46:12 -0700

You haven't mentioned why you're considering R in the first place.
For example, if you're planning to stay on the Win2K platform, the
easiest approach is probably to call your C modules from within R.
Since you know C, you probably won't find that to be too difficult.
On the other hand, if you're interested in R because you want to move
to some other platform (Linux, unix, Mac OS X), or want the freedom
of moving easily between platforms, then your C may not be easily
ported, in which case it's probably better to start afresh.

I think most R users would say it is very easy to draw/create graphs
in R. And indeed it is, for many kinds of graphs. But financial
graphs are somewhat specialized. The difficulty will depend on what
kind of customization you need. For example, if you have daily
closings, and want to graph them with Saturdays and Sundays omitted
from the graphs, and the gaps between Friday and Monday reduced, then
you have some significant customization to do. It definitely can be
done in R but you may not find to be easy (especially at first). With
that particular example in mind, however, I would bet that whatever
methods you used to construct the time axis could be implemented in R
fairly easily.

Hope this helps
-Don

At 12:27 PM +0000 5/9/02, Neil Osborne wrote:

I have written a series of C modules that produce various custom
(technical analysis) graphs when presented with a financial time
series. The code was developed on the Win2K and so makes many now
level function calls to the GDI etc, and is very tightly wedded to
the Win2k windowing system. I notice however, that most of the
graphing functionality in R (at least on the Windows OS) is handled
by GraphApp

This is the dillema I face:

Do I scrap the existing code and start from "afresh" (Please don't
say yes to this ! ;0)

How Can I "merge" my code into R with the minimum of fuss ?


If I have to start from afresh, I would like to know how easy it is
to draw/create graphs in R.

Many thanks in advance

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Help on creating custom financial time series graphs

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