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# What is the numpy.arccos() function in Python? Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

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### Overview

The numpy.arccos() function in Python is used to determine the inverse sine, element-wise, of a given array.

### Syntax

numpy.arccos(x, /, out=None, *, where=True)


### Parameter values

The numpy.arccos() function takes the following parameter values:

• x: This represents the x-coordinates on a unit circle. In a case where there are arguments, the domain is given as [-1, 1] This is a required parameter value.
• out: This represents a location where the result is stored. This is an optional parameter value.
• where: This is the condition over which the input is broadcast. At a given location where this condition is True, the resulting array will be set to the ufunc result. Otherwise, the resulting array will retain its original value. This is an optional parameter value.
• **kwargs: This represents the other keyword arguments.

### Return type

The numpy.arccos() function returns the inverse cosine of each element in a given array in radians and in a closed interval [0, pi].

### Code example

import numpy as np# creating an arrayx = np.array([[1, 0], [-1, -0.5]])# taking the arccos element-wisemyarray = np.arccos(x)print(myarray)
Implementing the numpy.arccos() function

### Code explanation

• Line 1: We import the numpy module.
• Line 4: We create an array x, using the array() method.
• Line 7: We implement the np.arccos() function on the array. Then, we assign the result to a variable called myarray.
• Line 9: We print the variable myarray to the console.

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CONTRIBUTOR Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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