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sgn(0) = 0 [Software]

posted by Helmut Homepage - Vienna, Austria, 2018-07-13 23:58  - Posting: # 19060
Views: 986

Hi mittyri,

» A question:
» is 0 a positive endpoint?

Nope. 0 is by definition neither positive nor negative.*

sgn(x < 0) = –1
sgn(x = 0) =   0
sgn(x > 0) = +1

Also

x = sgn(x)·|x|

Logarithms are defined only for >0.



Cheers,
Helmut Schütz
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