On Jan 7, 2013, at 6:58 PM, ivo welch wrote:
hi david---can you give just a little more of an example? the
function should work with call by order, call by name, and data frame
whose columns are the names. /iaw
It is I who should be expecting you to provide an example.
--
David.
----
Ivo Welch (ivo.we...@gmail.com)
On Mon, Jan 7, 2013 at 4:25 PM, David Winsemius <dwinsem...@comcast.net
> wrote:
On Jan 7, 2013, at 3:57 PM, ivo welch wrote:
dear R experts:
I want to define a function the calculates the black-scholes value.
it takes 5 named parameters, BS <- function(S,K,dt,rf,sigma) {} .
let's presume I want to be able to call this not only with my 5
numeric vectors BS( sigma=0.3, S=100, K=100, dt=1, rf=0.1 ) and BS(
100, 100, 1, 0.1, 0.3), but also with a data frame that contains the
variables alll in a neat data frame already, BS( data.frame( S=100,
K=100, dt=1, rf=0.1, sigma=0.3 )). I could of course define BS6 and
BS1, but it would be nice to wrap this functionality into one
function
that can do both.
I know that BS has to parse an '...' argument, but there could be a
couple of magical R functions that might make this easier than I
would
do it with my planned clunky version. what's the elegant
version?
apply( dfrm, 1, BS)
--
David Winsemius
Alameda, CA, USA
David Winsemius, MD
Alameda, CA, USA
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