Bioequivalence and Bioavailability Forum • sgn(0) = 0

sgn(0) = 0 [Software]

posted by Helmut – Vienna, Austria, 2018-07-14 01:58 (2505 d 08:16 ago) – Posting: # 19060
Views: 8,307

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 ℝ^>0.

The weird ISO 8601 mandates ‘+’ for 0. Treating zero in computation is yet another story.

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Complete thread:

WNL Calculation of partial areas > tlast with BQL= 0 rule Babe_Ruth 2018-07-13 21:36 [Software]
- WNL Calculation of partial areas > tlast with BQL= 0 rule ElMaestro 2018-07-13 22:25
- BQL = 0: bad rule Helmut 2018-07-13 23:28
  - BQL = 0: bad rule Babe_Ruth 2018-07-16 15:02
    - BQL = 0: bad rule Helmut 2018-07-16 16:02
      - BQL = 0: bad rule martin 2018-07-16 20:03
  - BQL = 0: bad rule martin 2018-07-16 20:43
- is zero positive? mittyri 2018-07-13 23:31
  - sgn(0) = 0Helmut 2018-07-13 23:58
  - is zero positive? Babe_Ruth 2018-07-16 14:49

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