ufunc Trigonometric

Trigonometric Functions

NumPy provides the ufuncs sin(), cos() and tan() that take values in radians and produce the corresponding sin, cos and tan values.

Example

  import numpy as np

x = np.sin(np.pi/2)

print(x)

Example

  import numpy as np

arr = np.array([np.pi/2, np.pi/3, np.pi/4, np.pi/5])

x = np.sin(arr)

print(x)

Convert Degrees Into Radians

By default all of the trigonometric functions take radians as parameters but we can convert radians to degrees and vice versa as well in NumPy.

Note: radians values are pi/180 * degree_values.

Example

  import numpy as np

arr = np.array([90, 180, 270, 360])

  x = np.deg2rad(arr)

print(x)

Radians to Degrees

Example

  import numpy as np

arr = np.array([np.pi/2, np.pi, 1.5*np.pi, 2*np.pi])

x = np.rad2deg(arr)

print(x)

Finding Angles

Finding angles from values of sine, cos, tan. E.g. sin, cos and tan inverse (arcsin, arccos, arctan).

NumPy provides ufuncs arcsin(), arccos() and arctan() that produce radian values for corresponding sin, cos and tan values given.

Example

  import numpy as np

x = np.arcsin(1.0)

print(x)

Angles of Each Value in Arrays

Example

  import numpy as np

arr = np.array([1, -1, 0.1])

x =
  np.arcsin(arr)

print(x)

Hypotenues

Finding hypotenues using pythagoras theorem in NumPy.

NumPy provides the hypot() function that takes the base and perpendicular values and produces hypotenues based on pythagoras theorem.

Example

  import numpy as np

base = 3
perp = 4

x = np.hypot(base, perp)

print(x)