The generic function is.na returns a logical vector of the same “form” as its argument x, containing TRUE for those elements marked NA or NaN (!) and FALSE otherwise. dim, dimnames and names attributes are preserved.
## S3 method for class 'fdata' is.na(x)
An observation is considered as NA if any of its values is NA.
A matrix of Logical values giving as rows the variables of
and as columns the observation.
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