[R] Best way to store negative indexes

Adaikalavan Ramasamy ramasamy at cancer.org.uk
Wed Jul 28 02:47:13 CEST 2004

Do you mean something like 
  abs( my_vector[i] - my_vector[j] )

See if reading help("subset") helps.

On Wed, 2004-07-28 at 01:42, StephaneDemurget wrote:
> Hi,
> I'm trying to figure out how to properly construct a graph of 
> frequencies of a difference between 2 values, that is | i | - | j |.
> I'd like to know the best way to store the actual data because of course 
> doing my_vector[i -j] will not work because the index could be negative.
> I know there's no hash table so what's the best solution, 
> simplicity-wise ? Use a list of pair of values {index, i - j} ? Or can I 
> somehow use negative index, perhaps using 0array ? Any help would be 
> appreciated :)
> ATM, I use as.character (i-j) to index my data, but I lose all the 
> processing power of R there after.
> Sorry If it's written somewhere, but I read a lot of docs about it, 
> searched through the ML archives and didn't manage to find an answer.
> Please also answer me back at my email address as I am not subscribed to 
> the list.
> Best regards,
> --Stephane
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