#Negative square root install#

Once you have it installed, you import it just like you did the math module: > import numpy as npīy convention, the NumPy module is aliased to the letters np, which can save you some keystrokes.

#Negative square root install#

NumPy does not come prepackaged with Python, so you may need to download it with your package manager first: $ python3 -m pip install numpy It stands for Numerical Python and allows programmers to perform advanced mathematical calculations however, it of course offers functionality for simpler operations, like finding the square root of a number. NumPy is another library that can be added to your Python installation. (It's a bit complex, as you'll see later on.)įor now, you can coerce the input to always be positive by using the Python absolute value function: > math.sqrt(abs(-4)) As such, negative real squares can't exist, and Python won't return a real value for such a number. This makes intuitive sense: a negative times a negative always equals a positive, and the square root is by definition a number multiplied by itself. In other words, the domain of numbers that you are allowed to find real square roots for are limited to n > 0: > math.sqrt(-4)Īs you can see, if you try to pass a negative number to the Python square root function located in the math module, you get a ValueError letting you know that the argument passed in is outside the domain of allowed values.

You may recall that square roots are only real for numbers that are greater than zero. > math.isqrt(12) # returns the nearest lowest whole number You can also call the math.isqrt() function, which will return an integer value by rounding down the result to the nearest whole integer: > math.sqrt(12) # returns the precise float If instead you want to return an integer, then you can round down the result like so: > round(math.sqrt(4)) However, note that math.sqrt() will always return a floating point number: > math.sqrt(4) # passing in an integerĢ.0 # still returns a floating point number The number you pass in can either be an integer or a float. The Python square root function found in the math module takes in a number and returns its square root.

Then, you specify the function from the math module that you want to call - in this case, math.sqrt(): > math.sqrt(4.0) It's part of the Python standard library, meaning it comes prepackaged with your Python installation and can be imported immediately: > import math The math module contains additional functions you can use to perform mathematical calculations. The first and most common method you can use to find the square root of a given number is to use the Python square root function located in the math module. In this article, you'll take a look at several different methods you can use to find the square root of a given number. This is the number, b, that when multiplied by itself yields the number a: a = b * b or a = b². All programming languages contain a plethora of functions that allow you to perform various mathematical calculations on numbers.įor example, say you want to find the square root of a number. One of the benefits of being a programmer is that you'll always have a calculator on hand. Calling the Python Square Root Function.