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# numpy.angle() in Python

• Last Updated : 28 Nov, 2018

`numpy.angle()` function is used when we want to compute the angle of the complex argument. A complex number is represented by “ x + yi ” where x and y are real number and `i= (-1)^1/2`. The angle is calculated by the formula `tan-1(x/y).`

Syntax : numpy.angle(z, deg=0)

Parameters :
z : [array_like] A complex number or sequence of complex numbers.
deg : [bool, optional] Return angle in degrees if True, radians if False (default).

Return :
angle : The counterclockwise angle from the positive real axis on the complex plane, with dtype as numpy.float64.

Code #1 : Working

 `# Python program explaining``# numpy.angle() function``# when we want answer in radian`` ` `import` `numpy as geek``in_list ``=``[``2.0``, ``1.0j``, ``1` `+` `1j``]`` ` `print` `(``"Input  list : "``, in_list)``   ` `out_angle ``=` `geek.angle(in_list) ``print` `(``"output angle in radians : "``, out_angle) `

Output :

```Input  list :  [2.0, 1j, (1+1j)]
output angle in radians :  [ 0.          1.57079633  0.78539816]
```

Code #2 : Working

 `# Python program explaining``# numpy.angle() function``# when we want answer in degrees`` ` `import` `numpy as geek``in_list ``=``[``2.0``, ``1.0j``, ``1` `+` `1j``]`` ` `print` `(``"Input  list : "``, in_list)``   ` `out_angle ``=` `geek.angle(in_list, deg ``=` `True``) ``print` `(``"output angle in degrees : "``, out_angle) `

Output :

```Input  list :  [2.0, 1j, (1+1j)]
output angle in degrees :  [  0.  90.  45.]
```

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