[R] RE : Must be easy, but haven't found the function (numerical integration)

[GOUACHE David]

try :

library(Bolsatd)
?sintegral

or:

library(caTools)
?trapz

David Gouache
Arvalis - Institut du Végétal
Station de La Minière
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] 
Envoyé : lundi 17 septembre 2007 12:09
À : 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.
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