[R] Count number of zeros in a collumn

[Murat Tasan]

more generally, if you want to test for some minimum threshold T on
the number of zeros, try:

> if(length(which(dart[,1977] == 0)) < T) { # some code to handle the too-few-zeros-case }




On Sep 27, 4:54 pm, Marcio Resende <mresende... at yahoo.com.br> wrote:
> I have a matrix 700x2000 which is sampled in each cycle from another matrix
> 788x2000 with the numbers 0,1 and 9
>
> There is one specific collumn of this matrix, dart[,1977], that usually,
> after the samplimg procedure has only 1 and 9 (because the zero frequency in
> this collumn is low).
> However, when this happens, I want to include an IF conditional in my code.
> so basically what i wanted to do was to count the number of zeros in this
> collumn to use this information in my conditional:
>
> something like:
>
> if (the number of zeros in collumn [,1977] is zero) ... else ...
>
> I tried to find out indirectly by the rowsum but because of the sampling
> procedure the rowsum is not always the same
>
> Thank you very much
> --
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