atan2(y, x) devuelve el valor de atan(y/x) en radianes. El método atan2() devuelve un valor numérico entre – 
y que representa el ángulo 
de un punto (x, y) y el eje x positivo.
Sintaxis:
atan2(y, x)
Parámetro:
(y, x) - Both must be a numeric value.
Devoluciones :
Returns atan(y / x), in radians. The double value is
Error de tecleado :
Returns a TypeError if anything other than float is passed.
Código #1:
# Python3 program to demonstrate
# the atan2() method
# imports math
import math
# prints the theta value of
# two negative co-ordinates
theta1 = math.atan2(-0.9, -0.9)
print("atan2(-0.9, -0.9) : ", theta1)
# prints the theta value of
# two positive co-ordinates
theta2 = math.atan2(1.2, 1.5)
print("atan2(1.2, 1.5) : ", theta2)
# prints the theta value of one
# positive and one negative co-ordinates
theta3 = math.atan2(1.2, -1.5)
print("atan2(1.2, -1.5):", theta3)
Producción :
atan2(-0.5, -0.5): -2.356194490192345 atan2(1.2, 1.5): 0.6747409422235526 atan2(1.2, -1.5): 2.4668517113662407
Código #2:
# Python3 program to demonstrate the atan() method # imports math import math # list containing x and y coordinates y = [1, 2, 3, 4] x = [6, 3, 7, 8] # traversing in range to get theta # for all y and x co-ordinates for i in range(len(x)): theta = math.atan2(y[i], x[i]) print(theta)
Producción :
0.16514867741462683 0.5880026035475675 0.40489178628508343 0.4636476090008061
Código #3: Programa que demuestra el error
# Python3 program to demonstrate the # TypeError in atan() method # importing math import math y, x = 3, 6 # when integer values are passed # it returns a TypeError theta = math.atan2([y], [x]) print(theta)
Producción :
Traceback (most recent call last):
File "/home/622586ab389561bcdbfff258aca01e65.py", line 9, in
theta = math.atan2([y],[x])
TypeError: a float is required
Aplicación práctica:
esta función se usa para encontrar la pendiente en radianes cuando se dan las coordenadas Y y X.
Código #4:
# Let's find the slope when X # and Y co-ordinates are given # imports math import math # X and Y are co-ordinates X = 2; Y = 2 # slope in radians theta1 = math.atan2(Y, X) # print the Slope in radians print(theta1)
Producción :
0.7853981633974483