Identify cells with
NaN in a data frame. Improve on the defeault
is.nan() function, which only works on vectors, by allowing
data frames as input.
## S3 method for class 'data.frame' is.nan(x)
A data frame to be tested.
A matrix of the same dimension as
x, with TRUE/FALSE values
for whether each cell in the original data frame is a number or not.
NaN means 'Not a Number'.
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