[R] Calling a function to store values

[David Winsemius]

On Mar 3, 2011, at 10:12 AM, kparamas wrote:

> Hi,
>
> I am calling a function with different arguments to read different  
> files and
> want the results to be stored in
> different matrices.
>
> Ex:
> cData1 = NULL
> cData2 = NULL
>
> readData = function(cData, start, end)
> {
>
> ....
>   cData = //reads from the file
> }
>
> I am calling the functions using
> readData(cData1,1,3)
> readData(cData2,4,7)
>
> But After running the code, cData1 and cData2 are not getting updated.
> Is there a way in R to do this?
You need to assign the results of the function to an R object in the  
global environment. At the moment calling readData() only creates the  
cData object in the environment of the function which then disappears  
after function completion.

Try :

cdata_1_1_3 <- readData(cData1,1,3)
cdata_2_4_7 <- readData(cData2,4,7)

>
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>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT