How can I use ATAN math function in Excel VB code. Do I need a special math addin?

Question

I am using trigometric math functions such Sin, Cos and Tan in VB code in my EXCEL spreadsheets. But a function like ATAN produces a coding error. Do I need to add a special math addin to be able to use a large variety of math functions?

Answer 1

Hi @John Laakso,

You do not need a special math add-in to use the ATAN function in Excel VBA code. The VBA function equivalent to Excel's ATAN function is Atn, which takes a number argument and returns the corresponding angle in radians. The range of the result is -pi/2 to pi/2 radians. To convert degrees to radians, multiply degrees by pi/180. To convert radians to degrees, multiply radians by 180/pi.

Here is an example of how to use the Atn function in VBA code:

Dim x As Double
Dim y As Double
Dim angle As Double

x = 3
y = 4
angle = Atn(y / x)

MsgBox "The angle is " & angle & " radians."

This code calculates the angle between the x-axis and a line from the origin to the point (3,4) in the Cartesian plane, using the Atn function.

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References:

• Atn function

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