[R] searching through a matrix

Spencer Graves spencer.graves at pdf.com
Mon Feb 28 00:53:47 CET 2005

      Does the following solve your problem: 

 is.na(array(c(NA, 1:5), dim=c(2,3)))
      [,1]  [,2]  [,3]

      spencer graves

Jessica Higgs wrote:

> I am trying to search through a matrix I have (x) to see if there are 
> any missing values. This is what I have been using:
> for (i in 1:3455)
>    for (j in 1:24)
>        if (is.na(x[i,j])) break;
> i
> j
> When I run the program, it either freezes or stops and returns the 
> last entry in the matrix (x[3455,24]). I need to figure out what 
> values in my data matrix are missing because I am using prcomp and it 
> keeps giving me an error starting that there are missing or infinite 
> values in  x. My data matrix does have some values that are equal to 
> zero but zero doesn't mean that the data is missing. it just indicates 
> that that value is equivalent to zero. Any suggestions for how to fix 
> this problem?
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