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st: atan2: Mata vs Stata

From   Chris Parker <>
Subject   st: atan2: Mata vs Stata
Date   Tue, 26 Feb 2013 19:59:46 -0500

Does anyone know why I get different answers for atan2 when
calculating in Mata and Stata? Here is an example from Stata/SE 12.1
for Mac

. disp atan2(sqrt(.0113631735),sqrt(1-.0113631735))

. mata
------------------------------------------------- mata (type end to
exit) -----------------------------------------------------------
: atan2(sqrt(.0113631735),sqrt(1-.0113631735))

: end

I feel like I must be missing something very simple but I can't figure
out what it is.

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