R help - Sep 2007 - Must be easy, but haven't found the function (numerical integration)

Hi,

I have a data frame of 2 columns with the following types :
data$day char
data$value num

And I plot my data with :
plot(strptime(donnees$day,format="%Y-%m-%d %H:%M:%S"),donnees$value,
type="l")

And I'd just like to get the numerical value of the integration of this
graph.
I looked at ?integrate but, as far as I understood (that is, not very much,
due to my poor english), it seems that it doesn't work with values in data
frame.

Could you please help me to do this ?

Thanks in advance,
Have a nice week,
Ptit Bleu.
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On 9/17/07, Ptit_Bleu <ptit_bleu at yahoo.fr>
wrote:
> I have a data frame of 2 columns with the following types :
> data$day char
> data$value num
>
> And I plot my data with :
> plot(strptime(donnees$day,format="%Y-%m-%d
%H:%M:%S"),donnees$value,
> type="l")
>
> And I'd just like to get the numerical value of the integration of this
> graph.
> I looked at ?integrate but, as far as I understood (that is, not very much,
> due to my poor english), it seems that it doesn't work with values in
data
> frame.
>
> Could you please help me to do this ?
I admit that others may find better solutions, but a possible solution
could be summing the areas of the trapezoids over the sequence of
them. It would be easy to program a function to do that, I guess

Paul

Hi,
When we install windows R 2.5.1 on a network drive ( the "P: ' drive,  
actually a samba public share )
R runs well but the windows help is unavailable.
It complains about "Navigation to the webpage was cancelled"
Does anyone know how to fix that?
Thanks, Bill

try :

library(Bolsatd)
?sintegral

or:

library(caTools)
?trapz

David Gouache
Arvalis - Institut du V?g?tal
Station de La Mini?re
78280 Guyancourt
Tel: 01.30.12.96.22 / Port: 06.86.08.94.32


-----Message d'origine-----
De?: Ptit_Bleu [mailto:ptit_bleu at yahoo.fr] 
Envoy??: lundi 17 septembre 2007 12:09
??: r-help at stat.math.ethz.ch
Objet?: [R] Must be easy,but haven't found the function (numerical
integration)


Hi,

I have a data frame of 2 columns with the following types :
data$day char
data$value num

And I plot my data with :
plot(strptime(donnees$day,format="%Y-%m-%d %H:%M:%S"),donnees$value,
type="l")

And I'd just like to get the numerical value of the integration of this
graph.
I looked at ?integrate but, as far as I understood (that is, not very much,
due to my poor english), it seems that it doesn't work with values in data
frame.

Could you please help me to do this ?

Thanks in advance,
Have a nice week,
Ptit Bleu.
-- 
View this message in context:
http://www.nabble.com/Must-be-easy%2C-but-haven%27t-found-the-function-%28numerical-integration%29-tf4465684.html#a12732936
Sent from the R help mailing list archive at Nabble.com.

Ptit Bleu.

try the  'adapt' function for multi-dimensional numerical integration.

library(adapt)
Adaptive Numerical Integration in 2?20 Dimensions

John



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