Returns an integer vector describing which values in the input vector, if any, are missing.
an R object, which should be of mode
an integer vector describing which values in the input vector, if any, are missing.
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## A non-zero number divided by zero creates ## infinity, zero over zero creates a NaN weird.values <- c(1/0, -20.9/0, 0/0, NA) ## Produces: 3 4. In this example, the which.na ## expression and the subscript expression ## involving is.na should return the same value which.na(weird.values) seq(along=weird.values)[is.na(weird.values)]
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