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[Tut] Python abs() Function

Python abs() Function

Python’s built-in `abs(x)` function returns the absolute value of the argument `x` that can be an integer, float, or object implementing the `__abs__()` function. For a complex number, the function returns its magnitude. The absolute value of any numerical input argument `-x` or `+x` is the corresponding positive value `+x`.

## Example Integer abs()

The following code snippet shows you how to use the absolute value 42 of a positive integer value 42.

```# POSITIVE INTEGER
x = 42
abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}")
# Absolute value of 42 is 42```

The following code snippet shows you how to use the absolute value 42 of a negative integer value -42.

```# NEGATIVE INTEGER
x = -42
abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}")
# Absolute value of -42 is 42```

## Example Float abs()

The following code snippet shows you how to use the absolute value 42.42 of a positive integer value 42.42.

```# POSITIVE FLOAT
x = 42.42
abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}")
# Absolute value of 42.42 is 42.42```

The following code snippet shows you how to use the absolute value 42.42 of a negative integer value -42.42.

```# NEGATIVE FLOAT
x = -42.42
abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}")
# Absolute value of -42.42 is 42.42```

## Example Complex abs()

The following code snippet shows you how to use the absolute value of a complex number (3+10j).

```# COMPLEX NUMBER
complex_number = (3+10j)
abs_complex_number = abs(complex_number) print(f"Absolute value of {complex_number} is {abs_complex_number}")
# Absolute value of (3+10j) is 10.44030650891055
```

## Python abs() vs fabs()

Python’s built-in function `abs(x)` calculates the absolute number of the argument `x`. Similarly, the `fabs(x)` function of the math module calculates the same absolute value. The difference is that `math.fabs(x)` always returns a float number while Python’s built-in `abs(x)` returns an integer if the argument `x` is an integer as well. The name “fabs” is shorthand for “float absolute value”.

Here’s a minimal example:

```x = 42 # abs()
print(abs(x))
# 42 # math.fabs()
import math
print(math.fabs(x))
# 42.0```

## Python abs() vs np.abs()

Python’s built-in function `abs(x)` calculates the absolute number of the argument `x`. Similarly, NumPy’s `np.abs(x)` function calculates the same absolute value. There are two differences: (1) `np.abs(x)` always returns a float number while Python’s built-in `abs(x)` returns an integer if the argument `x` is an integer, and (2) `np.abs(arr)` can be also applied to a NumPy array `arr` that calculates the absolute values element-wise.

Here’s a minimal example:

```x = 42 # abs()
print(abs(x))
# 42 # numpy.abs()
import numpy as np
print(np.fabs(x))
# 42.0 # numpy.abs() array
a = np.array([-1, 2, -4])
print(np.abs(a))
# [1 2 4]```

abs and np. absolute are completely identical. It doesn’t matter which one you use. There are several advantages to the short names: They are shorter and they are known to Python programmers because the names are identical to the built-in Python functions.

## Summary

The `abs()` function is a built-in function that returns the absolute value of a number. The function accepts integers, floats, and complex numbers as input.

If you pass `abs()` an integer or float, `n`, it returns the non-negative value of `n` and preserves its type. In other words, if you pass an integer, `abs()` returns an integer, and if you pass a float, it returns a float.

```# Int returns int
>>> abs(20)
20
# Float returns float
>>> abs(20.0)
20.0
>>> abs(-20.0)
20.0```

The first example returns an int, the second returns a float, and the final example returns a float and demonstrates that `abs()` always returns a positive number.

Complex numbers are made up of two parts and can be written as `a + bj` where `a` and `b` are either ints or floats. The absolute value of `a + bj` is defined mathematically as `math.sqrt(a**2 + b**2)`. Thus, the result is always positive and always a float (since taking the square root always returns a float).

```>>> abs(3 + 4j)
5.0
>>> math.sqrt(3**2 + 4**2)
5.0```

Here you can see that `abs()` always returns a float and that the result of `abs(a + bj)` is the same as `math.sqrt(a**2 + b**2)`.

## Where to Go From Here?

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The post Python abs() Function first appeared on Finxter.

https://www.sickgaming.net/blog/2020/11/...-function/

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