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Test if an object is positive
is_positive(x)
an R object
is_negative
is_positive(1) is_positive(0) is_positive(-1) is_positive(iris$Species) is_positive(iris) is_positive(list(1, 0, -1, iris)) set.seed(999) M = matrix(rnorm(12), 4, 3) is_positive(M)
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