# [R] Contingency table and zeros

Mon Mar 6 11:26:58 CET 2006

``` > myvector <-  c(1, 2, 3, 2, 1, 3, 5)
> myf <- factor(myvector, levels=1:5)
> table(myf)
myf
1 2 3 4 5
2 2 2 0 1
> cumsum(table(myf))
1 2 3 4 5
2 4 6 6 7

Nicolas Perot a écrit :

>Hello,
>
>Let's assume I have a vector of integers :
> > myvector <-  c(1, 2, 3, 2, 1, 3, 5)
>
>My purpose is to obtain the cumulative distribution of these numerical
>data, i.e. something like :
>
>value	nb_occur.
><=1    2
><=2    4
><=3    6
><=4    6
><=5    7
>
>For this, I create a table with ;
> > mytable <- table(myvector)
>
>1 2 3 5
>2 2 2 1
>
>However, table() returns an array of integers, mytable[4] returns the
>occurence number of the "5" item, which makes this table hard to index.
>I would prefer to have a data structure where mytable[4] could return 0,
>as there is no "4" in my vector.
>
>table() may not be the proper way to do it.
>
>For the moment, I use a loop which scans the vector from its lowest
>value to its highest, and counts the number of times each value appears.
>
>Is there a built-in function, or a table() option to do such a task ?
>
>Thanks.
>
>Regards,
>Nicolas
>
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