Difference between revisions of "ATAN2"

Revision as of 01:13, 5 September 2017

The _ATAN2 function returns the radian angle between the positive x-axis of a plane and the point given by the coordinates (x, y).

angle! = _ATAN2(y, x)

y is the vertical axis position (row) as a positive, zero or negative floating point value.
x is the horizontal axis position (column) as a positive, zero or negative floating point value.

The DOUBLE radian angle returned is positive for upper row values where y > 0.

The DOUBLE radian angle returned is 0 when x > 0 and _PI when x < 0 where y = 0
The DOUBLE radian angle returned is negative for lower row values where y < 0.

_ATAN2(0, 0) is undefined and the function returns 0 instead of a division error.

With ATN(y / x), x can never be 0 as that would create a Division by Zero error 11 or #IND.

Revision as of 01:10, 5 September 2017 (view source) imported>SMcNeill (style guidelines) ← Older edit		Revision as of 01:13, 5 September 2017 (view source) imported>SMcNeill m Newer edit →
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	{{DISPLAYTITLE:_ATAN2}}		{{DISPLAYTITLE:_ATAN2}}
−	The ~~'''~~_ATAN2~~'''~~ function returns the radian angle between the positive x-axis of a plane and the point given by the coordinates (x, y).	+	The {{KW\|_ATAN2}} function returns the radian angle between the positive x-axis of a plane and the point given by the coordinates (x, y).