[R] arrays of arrays
murdoch.duncan at gmail.com
Wed Nov 10 12:40:27 CET 2010
On 10/11/2010 12:12 AM, Michael Bedward wrote:
> Hello Sachin,
> You have a "ragged array" and you can easily store this as a list of vectors...
> x<- list(c(0,0,1,1), c(1,3,5), 4, c(7, -1, 8, 9, 10, 6))
> The only gotcha with this is that you will then need to use double
> brackets for the first index when retrieving values (single brackets
> will return a vector wrapped in a list)...
> e.g. x[] gives 5
An alternative syntax that is sometimes easier to work with is
This needs the double brackets; x[c(2,3)] would be a list holding items
2 and 3 from x, i.e. list(c(1,3,5), 4).
> You can query vector length with double brackets...
> e.g. length( x[] ) gives 3
> Hope this helps,
> On 10 November 2010 16:00,<sachinthaka.abeywardana at allianz.com.au> wrote:
>> Hi Erik,
>> Thanks for replying. Only problem with that is that each row has 5 elements
>> (or 5 columns). I want varying number of columns as shown in my example.
>> x<- 0 0 1 1
>> 1 3 5
>> 7 -1 8 9 10 6
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