[R] sum of digits or how to slice a number into its digits

[Dimitris Rizopoulos]

one way is using function strsplit(), e.g.,

x <- c("100100110", "1001001", "1101", "00101")
sapply(strsplit(x, ""), function (x) sum(x == 1))


I hope it helps.

Best,
Dimitris


On 3/4/2011 2:18 PM, drflxms wrote:
> Dear R colleagues,
>
> I face a seemingly simple problem I couldn't find a solution for myself
> so far:
>
> I have to sum the digits of numbers. Example: 1010 ->2 100100110 ->  4
> Unfortunately there seems not to be a function for this task. So my idea
> was to use sum(x) for it. But I did not figure out how to slice a number
> to a vector of its digits. Example (continued from above): 1010 ->
> c(1,0,1,0)  100100110 ->  (1,0,0,1,0,0,1,1,0).
>
> Does anyone know either a function for calculating the sum of the digits
> of a bumber, or how to slice a number into a vector of its digits as
> described above?
>
> I'd appreciate any kind of help very much!
> Thanx in advance and greetings from cloudy Munich,
> Felix
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
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