R help - May 2005 - Turnpoints (pastecs): How to specify a limit on the number of tur npoints?

Hello,

I'm trying to get a few turnpoints for a financial time series.  There is a
function in pastecs that does that.  However, I get a large number of
turnpoints:

library(pastecs)
data(EuStockMarkets)
dax <-EuStockMarkets[,1]
plot(dax)
turnp <-turnpoints(dax)  
summary(turnp) #gives 925 peaks/pits!!!

How can specify to get only 30 turnpoints?

Second question: the extract function 

extract(turnp,30)

gives me this: 
> extract(turnp,30)
 [1]  0  0 -1  1  0 -1  0  1 -1  0  1  0  0 -1  0  0  1  0  0 -1  0  0  0  1
-1
[26]  1 -1  1 -1  1
Warning message:
arguments after the first two are ignored in: UseMethod("extract", e,
n,
...) 
>
Any odea what caused this error?

I'm on win2k,
> version
         _              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status   Patched        
major    2              
minor    1.0            
year     2005           
month    05             
day      09             
language R              
>


Regards,

Pierre Lapointe
Assistant Market Strategist



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