Difference between revisions of "ATAN2"
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imported>SMcNeill m |
imported>SMcNeill m (-) |
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: {{Parameter|angle!}} = {{KW|_ATAN2}}({{Parameter|y}}, {{Parameter|x}}) | : {{Parameter|angle!}} = {{KW|_ATAN2}}({{Parameter|y}}, {{Parameter|x}}) | ||
| − | + | {{Parameters}} | |
* {{Parameter|y}} is the vertical axis position (row) as a positive, zero or negative floating point value. | * {{Parameter|y}} is the vertical axis position (row) as a positive, zero or negative floating point value. | ||
* {{Parameter|x}} is the horizontal axis position (column) as a positive, zero or negative floating point value. | * {{Parameter|x}} is the horizontal axis position (column) as a positive, zero or negative floating point value. | ||
| − | + | {{PageDescription}} | |
* The [[DOUBLE]] radian angle returned is '''positive''' for upper row values where y > 0. | * The [[DOUBLE]] radian angle returned is '''positive''' for upper row values where y > 0. | ||
::* _ATAN2(y, x) = [[ATN]](y# / x#) when x > 0 | ::* _ATAN2(y, x) = [[ATN]](y# / x#) when x > 0 | ||
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| − | + | {{PageErrors}} | |
* With [[ATN]](y / x), x can never be 0 as that would create a Division by Zero [[ERROR Codes|error]] 11 or #IND. | * With [[ATN]](y / x), x can never be 0 as that would create a Division by Zero [[ERROR Codes|error]] 11 or #IND. | ||
| − | + | {{PageSeeAlso}} | |
* [[ATN]] {{text|(arctangent)}} | * [[ATN]] {{text|(arctangent)}} | ||
* [[_PI]] {{text|(QB64 function)}} | * [[_PI]] {{text|(QB64 function)}} | ||
Revision as of 03:04, 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).
Syntax
- angle! = _ATAN2(y, x)
Parameters
- 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.
Description
- 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.
Errors
See also
- ATN (arctangent)
- _PI (QB64 function)
- Mathematical Operations
- Atan2 reference