R help - Feb 2005 - searching through a matrix

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?

Does the following solve your problem: 

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

      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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