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 Nov 23 awarded Popular Question Sep 26 awarded Famous Question Aug 31 awarded Popular Question Jun 8 awarded Nice Question Jun 4 awarded Quorum Mar 9 awarded Notable Question Sep 24 awarded Autobiographer Jul 2 awarded Curious Jun 16 awarded Popular Question Nov 29 awarded Notable Question May 16 comment Simplify difference of two arc tangents? Thanks Joseph, I will have to dig into it in more detail. May 16 revised Simplify difference of two arc tangents? added 43 characters in body May 16 asked Simplify difference of two arc tangents? May 11 awarded Popular Question May 3 accepted Stuck on 'differentiating the integral from above' for computing of a PDF May 2 comment Stuck on 'differentiating the integral from above' for computing of a PDF Wait... is it because $\frac{d}{dz}F_Y(-z) = \frac{d}{dz}[F_Y(\infty) - F_Y(z)] = \frac{d}{dz}[1 - F_Y(z)] = -f_Y(z)$ ?... May 2 comment Stuck on 'differentiating the integral from above' for computing of a PDF Thanks, but can you please explain how $\frac{d}{dz}F_Y(-z) = -f_Y(z)$?.... May 2 asked Stuck on 'differentiating the integral from above' for computing of a PDF Feb 24 awarded Yearling Jan 26 comment What is the intuition behind a function being 'weakly differentiable'? Christopher, by sign(x[n]) I just mean the non-linear operation of taking the sign of that particular number in the vector. For example, in my case, if my x[n] = [-2 1 4 -18 4 -3], then sign(x[n]) = [-1 1 1 -1 1 -1]