Which is the most efficient way to determine if the columns of a matrix are all integers, e.g. a = [1 1.5 2; 10 3.1 3] columns 1 and 3 ? Note that if I would have defined a = Any[1 1.5 2; 10 3.1 3] I could have used julia> identity.(a[:,1]) 2-element Vector{Int64}: 1 10 and then use eltype, …

How to efficiently determine if a column of a matrix is made of integers

jar1 October 4, 2022, 9:01am 2

julia> isinteger.(Any[1 1.5 2; 10 3.1 3])
2×3 BitMatrix:
 1  0  1
 1  0  1

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