Hi
the following gave me a shock:
> atan(2) [1] 1.107149 > atan(2+0i) [1] -0.4636476+0i >
or, perhaps more of a gotcha:
> atan(1.0001+0i) [1] -0.7853482+0i > atan(0.9999+0i) [1] 0.7853482+0i >
evidently atan()'s branch cuts aren't where I thought they were.
Where do I look for documentation on this?
-- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743
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