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Opposite of is.vector(). Check if entry is not vector
not.vector(x)a boolean value to indicate if entry is vector
vector entry
vect1 = list(r=1,t=3:10)
vect2 = LETTERS
is.vector(vect1) # TRUE
not.vector(vect1) # FALSE
not.vector(vect2) # FALSE
if(not.vector(vect1)) message("yes") # NULL
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