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