I' ve tried your suggestions but the results are wrong.I don't
understand...i explain my request in a new way.
I have this table named data-4-bk.csv

"Y/h","u/U_b","v/U_b","uu/U_b^2","vv/U_b^2","uv/U_b^2","k/U_b^2"
0.16067E-02,-0.11652E-01,0.30712E-04,0.11377E-02,0.37886E-06,-0.12657E-05,0.13570E-02
0.48616E-02,-0.28583E-01,-0.10085E-03,0.72322E-02,0.44299E-04,-0.17874E-04,0.78991E-02
0.82005E-02,-0.40079E-01,-0.25124E-03,0.14272E-01,0.23333E-03,-0.75078E-04,0.15054E-01
0.11625E-01,-0.47481E-01,-0.50081E-03,0.19783E-01,0.60134E-03,-0.17623E-03,0.20764E-01
0.15139E-01,-0.52047E-01,-0.78504E-03,0.23607E-01,0.11297E-02,-0.31123E-03,0.25042E-01
0.18743E-01,-0.54658E-01,-0.11273E-02,0.26189E-01,0.17884E-02,-0.46941E-03,0.28287E-01
0.22439E-01,-0.55902E-01,-0.15016E-02,0.27935E-01,0.25450E-02,-0.64447E-03,0.30825E-01
0.26231E-01,-0.56181E-01,-0.19149E-02,0.29136E-01,0.33728E-02,-0.83204E-03,0.32881E-01
0.30121E-01,-0.55777E-01,-0.23570E-02,0.29974E-01,0.42480E-02,-0.10299E-02,0.34591E-01
0.34111E-01,-0.54897E-01,-0.28303E-02,0.30577E-01,0.51528E-02,-0.12376E-02,0.36045E-01
0.38204E-01,-0.53696E-01,-0.33293E-02,0.31034E-01,0.60717E-02,-0.14533E-02,0.37305E-01
0.42403E-01,-0.52267E-01,-0.38533E-02,0.31403E-01,0.69931E-02,-0.16763E-02,0.38415E-01
0.46709E-01,-0.50663E-01,-0.43996E-02,0.31712E-01,0.79083E-02,-0.19064E-02,0.39403E-01

I give these R commands to import the file

quattro <- read.csv('data-4-bk.csv', header=TRUE)
attach(quattro)
names(quattro)

Then i'd like to calculate the new variable "t" defined as:

First element of u/U_b column * Second element of Y/h column
Second element of u/U_b column * Third element of Y/h column
etc.. etc..

Now i' d like to print the values of t as a new column on the original
data-4-bk.csv

Thanks and sorry for my newbie request.





2009/6/2 Simon Pickett <simon.pickett@bto.org>

> you could use a loop but maybe easier would be
> x<-c(NA,x)
> y<-c(y,NA)
> t<-x*y
>
> use write.table() to write the table to your hard drive
>
> e.g.
>
> write.table(t, file="C:/Documents and Settings/simonp/My Documents/RELU/GIS
> data/Land Cover Map working/squares plus adjoining parcels/Scotland/scotland
> adj squares.csv", sep = ",",row.names = F)
>
> HTH, Si.
>
> ----- Original Message ----- From: "Carletto Rossi" <nuovodna@gmail.com>
> To: <r-help@r-project.org>
> Sent: Tuesday, June 02, 2009 11:22 AM
> Subject: [R] newbie help: simple operations in R
>
>
>  Hi, i' d like to use R for simple calculations. I show you an examples to
>> make clear my help request
>>
>> I' ve a file .csv like this (my real file is composed by 10.000 lines and
>> 8
>> columns)
>>
>> x y
>> 3 4
>> 1 7
>>
>> I' ve imported in R correctly. Now i want create a new variable named "t"
>> and t is defined throught this relation:
>>
>> t = 4 (second element on x column) * 4 (first element on y column)
>>
>> in what way can i calculate t and print its value on an external file or,
>> better, append t values as a column on my original csv???
>>
>> Thanks
>>
>> Emanuele
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>

	[[alternative HTML version deleted]]


