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# What is atan() in R?

harris910

The atan()also called the arc tangent function function in R 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 1: Mathematical representation of inverse tangent function

Figure 2 shows the visual representation of the atan() function.

Figure 2: Visual representation of inverse tangent 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);

b <- atan(-0.5);

#applying atan() and then converting the result in radians to degrees
c <- atan(1) * (180.0 / pi);
print(paste0("tan(1): ", c, " degrees"))


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math
tangent
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