atan() math function to get arc tan of input number in radian in Python

atan(x) returns arc tan of x. Input number is in radian

import math
print(math.atan(0))      # 0.0
print(math.atan(0.1))    # 0.09966865249116204
print(math.atan(0.5))    # 0.4636476090008061
print(math.atan(1.5))    # 0.982793723247329
print(math.atan(10))     # 1.4711276743037347
print(math.atan(50))     # 1.550798992821746
print(math.atan(500))    # 1.5687963294615568

Note that all the inputs are in radian.
Using negative input value

import math
print(math.atan(-0.1))    # -0.09966865249116204
print(math.atan(-0.5))    # -0.4636476090008061
print(math.atan(-1.5))    # -0.982793723247329
print(math.atan(-10))     # -1.4711276743037347
print(math.atan(-50))     # -1.550798992821746
print(math.atan(-500))    # -1.5687963294615568

Inputs in degree

We can convert radian value to degree and use the same

import math
in_degree = 57
in_redian = math.radians(in_degree)
print(math.atan(in_redian))

Output

0.782810326348054

1 radian = 57.2957914331 degree
1 degree = 0.0174533 radian

Drawing graph of atan()

In our Trigonometric language atan is also know as arctan. Using this we will use Matplotlib to generate graph of atan $atan graph$

import matplotlib.pyplot as plt
x=[]
y=[]
i=-1
while (i<=1):
    x.append(i)
    y.append(math.atan(i))
    i=i+0.01
plt.plot(x,y)    
plt.show()

acos() asin() sin() tan()

Math Functions copysign() Python- Tutorials

Subhendu Mohapatra

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