[R] Creating data.frames dynamically

[Yasir Kaheil]

Hi Worik:

Is this what you want?

> Names <- letters[1:5];
> Dates<- 1:20;
> d<- data.frame(dates=Dates, a = vector(mode="numeric",
> length=length(Dates)));
> for(i in 2:5){d[,paste(sep="",Names[i])]<-with(d,a)}; d
   dates a b c d e
1      1 0 0 0 0 0
2      2 0 0 0 0 0
3      3 0 0 0 0 0
4      4 0 0 0 0 0
5      5 0 0 0 0 0
6      6 0 0 0 0 0
7      7 0 0 0 0 0
8      8 0 0 0 0 0
9      9 0 0 0 0 0
10    10 0 0 0 0 0
11    11 0 0 0 0 0
12    12 0 0 0 0 0
13    13 0 0 0 0 0
14    14 0 0 0 0 0
15    15 0 0 0 0 0
16    16 0 0 0 0 0
17    17 0 0 0 0 0
18    18 0 0 0 0 0
19    19 0 0 0 0 0
20    20 0 0 0 0 0


thanks
y

Worik R wrote:
> 
> I have time series data in named vectors.  They are all the same length
> for
> the same dates.
> 
> The dates are in a separate vector.
> 
> I want to create a vector of numeric data for every named series,
> associated
> with the dates in a data.frame.
> 
> So if...
> 
> Names <- c("a", "b", "c")
> 
> d <- data.frame(dates=Dates, a=vector(mode="numeric",
> length=length(Dates),
> b=vector(mode="numeric", length=length(Dates), c=vector(mode="numeric",
> length=length(Dates))
> 
> Then I copy the processed data into d
> 
> for(i in SomeVectorOfFactors){
>     for(N in Names){
>         d[[N]][i] <- FunctionCallOfSomeSort(i)
>     }
> }
> 
> 
> I want to create the data.frame, d, in the same style I access it.
> 
> d <- data.frame(dates=Dates, [[Names]]=vectors(.....))
> 
> Then it is much simpler to add new columns.
> 
> Worik                                                                 ST
> 
> 	[[alternative HTML version deleted]]
> 
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> 
> 


-----
Yasir H. Kaheil
Catchment Research Facility
The University of Western Ontario 

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