Hi! 1st time I'm posting here. I'm beginning to learn R and I've encountered
a problem that I'm unable to solve so far.
I have a 20 000 x 5 matrix. In the 5th column, I have elevation. Missing
value are actually put to -99999. I want to track down the index of those
values and replace them with NA. I've read that to replace, the command
"replace" is enough. I just don't know how to construct the index vector that
contains the index of -99999 values.
Hope this makes sense,
Thanks!
Philippe
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