Return Negative Elements of a Numeric Vector
Simply returns the negative (or non-positive) elements of some input vector x. Defined as x[which(x < 0)] or x[which(x <= 0)] depending on include.zero input.
If TRUE, elements <= 0 are returned; if FALSE, elements < 0 are returned.
Dane R. Van Domelen
Acknowledgment: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-0940903.
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