[R] Help with cumsum function
Uwe Ligges
ligges at statistik.uni-dortmund.de
Sat Aug 11 18:31:21 CEST 2007
Hectorman Hectorman wrote:
> Hello!
>
> I have a question regarding the cumsum function that I do not know how to
> solve. Would appreciate help from someone. I have imported data from a
> txtfile with 2 columns. I am interested in the seconds column, which
> contains numbers from i=0 to 40. I would like to count the number of
> instances of the numbers 0 to 40 in the seconds column. My problem is that
> if there are no observations of one number i in the second column cumsum
> skips this in the output.
>
> Below is an example of the output of the argument Y=cumsum(table(x[,2]))
> 0 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18
> 19 20 21 22 23 24
> 3 5 6 10 13 14 16 18 21 25 27 30 32 35 38 40 42 54 105
> 233 306 341 383 417
> 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
> 441 468 487 502 518 532 542 546 552 564 566 574 578 584 591 594
>
> As you can see from the output there are no observations of i=4 in this
> column. Are there any way I could return the following result instead
> 0 1 2 3 4 5 6 7 8 and so on
> 3 5 6 10 10 13 14 16 18
>
> When i=4 cumsum is the same as when i=3 (10)
>
Y <- cumsum(table(factor(x[,2], levels=0:40)))
Uwe Ligges
> I would really appreciate if anyone could help me with this one:)
>
> Jan Moberg
>
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