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What is atan() in R?
harris910
The arc tangent functionR returns the inverse tangent of a number. More specifically, it returns the inverse tangent of a number in radians.
Figure 1 below shows the mathematical representation of the atan() function.
Figure 2 shows the visual representation of the atan() function.
Methodology
To convert radians to degrees, use:
degrees = radians * ( 180.0 / pi )
Syntax
atan(num)
Parameter
This function requires a number as a parameter.
Return value
atan() will return the inverse tangent of a number (radians) sent as a parameter. The return values lie in the interval [-pi/2,pi/2] in radians.
Code
#Positive number in radians
a <- atan(0.5);
print(paste0("atan(0.5): ", a, " radians"))
#negative number in radians
b <- atan(-0.5);
print(paste0("atan(-0.5): ", b, " radians"))
#applying atan() and then converting the result in radians to degrees
#radians = 1.0
c <- atan(1) * (180.0 / pi);
print(paste0("tan(1): ", c, " degrees"))
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