March 2003
Intermediate to advanced
512 pages
14h 30m
English
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Name
Atn Function
Syntax
Atn(number)numberUse: Required
Data Type: Numeric
Any numeric expression, representing the ratio of two sides of a right angle triangle.
Return Value
The return value is a Double representing the arctangent of
number in the range -pi/2 to pi/2
radians.
Description
Takes the ratio of two sides of a right triangle
(number) and returns the corresponding
angle in radians. The ratio is the length of the side opposite the
angle divided by the length of the side adjacent to the
angle.
Rules at a Glance
If no number is specified, a runtime error is generated.
The return value of Atn is in radians, not degrees.
Example
<%
Const Pi = 3.14159
Dim dblSideAdj, dblSideOpp
Dim dblRatio, dblAtangent, dblDegrees
dblSideAdj = 50.25
dblSideOpp = 75.5
dblRatio = dblSideOpp / dblSideAdj
dblAtangent = Atn(dblRatio)
' convert from radians to degrees
dblDegrees = dblAtangent * (180 / Pi)
Response.Write dblDegrees & " Degrees"
%>Programming Tips and Gotchas
To convert degrees to radians, multiply degrees by pi/180.
To convert radians to degrees, multiply radians by 180/pi.
Don’t confuse Atn with the cotangent. Atn is the inverse trigonometric function of Tan, as opposed to the simple inverse of Tan.
See Also
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.