May 1995
Beginner
508 pages
16h 14m
English
Content preview from VBScript in a Nutshell
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Name
Atn Function
Syntax
Atn(number)-
number Use: Required
Data Subtype: Numeric
Any numeric expression, representing the ratio of two sides of a right angle triangle.
Return Value
The return value is a Double data subtype 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
Atnis in radians, not degrees.
Example
<%
Dim dblSideAdj
Dim dblSideOpp
Dim dblRatio
Dim dblAtangent
dblSideAdj = 50.25
dblSideOpp = 75.5
dblRatio = dblSideOpp / dblSideAdj
dblAtangent = Atn(dblRatio)
'convert from radians to degrees
dblDegrees = dblAtangent * (180 / 3.142)
Response.Write dblDegrees & " Degrees"
%>Programming Tips & Gotchas
To convert degrees to radians, multiply degrees by pi/180.
To convert radians to degrees, multiply radians by 180/pi.
Don’t confuse
Atnwith the cotangent.Atnis the inverse trigonometric function ofTan, as opposed to the simple inverse ofTan.
See Also
| Tan Function |
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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.
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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.