Introduction To Python Math Library
For a mathematical calculation in Python, In other words, you can use the built-in mathematics operators, such as addition(+), subtraction(-), multiplication(*), division(/). This operator is basic, and it is limited for calculation. So, more advanced math operations in a python, such as logarithmic, exponential, trigonometric function. All methods of these functions are used for integer or real type objects, not for complex numbers.
About Python math Module
The python math module is to deal with mathematical operations. It comes with already packages with standard function (operator). Most of the math Library is wrappers around ‘C’ platform’s mathematical functions. Therefore, it’s underlying functions are written in CPython.
Install math package:- you don’t have to install it separately. Already inbuilt in Python. just import like this, import math
Install math package
you don’t have to install it separately. Already inbuilt in Python math Library. just import like this, import math
Why math Library instead of NumPy?
NumPy vs math Use NumPy if you are doing scientific computations with arrays, matrices, or large datasets or 3D dimension datasets. NumPy is a third party package towards scientific computing. It means you have to install it. Mostly used are scientific computing and its data science field. It is best optimized for vector and array operations. The NumPy is high.
It is faster for such operations than say just using a list. For more details https://numpy.org/.Use math if you are doing simple computations with only scalars data, trigonometric computation not list, or arrays.math is a standard library.
It provides a basic mathematical function as well as advanced and constants. When working with scalar values, math Library can be faster than their NumPy counterparts. Because the NumPy functions convert into arrays
cmath vs math
The math module supplies mathematical functions on floating-point numbers, while the cmath module supplies equivalent functions on complex numbers.
A complex number is a combination of imaginary and real number.
formulated as a+bi,Where,
a = is a real number
bi = is an imaginary number
A real number is a value of a continuous quantity that can represent a distance along a line. In other words, you can think of any number. Number of normal use, such as 1, 4.56, -7.8, 9/4Positive or negative, large or small, whole numbers or decimal numbers are all Real Numbers.
An Imaginary number, When squared, gives a negative result.Imaginary numbers are shown as i
They describe the arithmetic properties of numbers and are widely used in the field of number theory. The natural theory is a branch of pure mathematics, which is the study of natural numbers. Which deals with positive whole numbers or integers
This function returns the smallest integral value greater than or equal to the given number. If the given number is an integer, the same number is returned. If the number is a positive or negative decimal, then the function will return the next integer value greater than the given value.
import math a = 9.8 b = math.ceil(a) print("the ceil of 9.8 is:",b)
(the floor of 9.8 is :’, 9.0)
This function returns the greatest integral value smaller than the number. If the given number is an integer, the same number is returned.
a = 9.8 b = math.floor(a) print("the floor of 9.8 is:",b)
(‘the floor of 9.8 is:’,9.0)
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This function returns the factorial of the number.
math.factorial(5) out:-120 math.factorial(4.7) ValueError Traceback (most recent call last) <ipython-input-8-de4b77638d6b> in <module>() ----> 1 math.factorial(4.7) ValueError: factorial() only accepts integral values math.factorial(-8) ValueError Traceback (most recent call last) <ipython-input-9-a613a6ffd2a3> in <module>() ----> 1 math.factorial(-8) ValueError: factorial() not defined for negative values
It is the elimination part after the decimal point. It means when you get a number with a decimal point, you might want to keep only the integer part and eliminate the decimal part. Removing the decimal value is a type of rounding. The negative number always rounds off zero or positive
math.trunc(34.78) output: 34 math.trunc(67) output:67 math.trunc(-9.7) output:-9
To determine whether two numbers are close to each other.
Definition of Close: close means “near in time, space, effect”.
For Example, 1.47, 1.48, 1.478 measure closeness by two decimal points,1.47, 1.48
math.isclose(8,9) False math.isclose(8.8999,9) True
Compare two numbers using the tolerances:
1. Relative tolerance:
or rel_tol, is the maximum difference for being considered “close”.The default value is 1e-092.
2: Absolute tolerance:
or abs_tol, is the maximum difference for being considered “close”.The default value is 0.0
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The logarithmic function can be considered the inverse of exponential functions.Denoted by
Here b is the base of the logarithm, which can be any number.
The logarithm having base e.
With the exponential function, natural log uses the constant e. It’s generally used to calculate values such as the rate of population growth.
math.exp(32) 78962960182680.69 math.exp(-97) 7.47197233734299e-43 math.exp(5.6) 270.42640742615254 math.exp("y") --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-38-4fce065a7e97> in <module>() ----> 1 math.exp("y") TypeError: a float is required
log2() and log10()
The math module also provides two separate log functions that calculate the log values base 2 and 10.
math.log(math.pi,2) o/p:-1.651496129472319 math.log(10,2) o/p:- 3.3219280948873626
math.log10(math.pi) 0.4971498726941338 math.log10(6) 0.7781512503836436 math.log10(10) 1.0
The power function takes any number x as input, raises x to some power n, and returns x power n. A power function is in the form of f(x) = kx^n, where k = all real numbers and n = all real numbers.
If n is greater than zero, then the function is proportional to the nth power of x.
- pow(): Power functions have the following formula where the variable x is the base, the variable n is the power, and can be any constant.
f(x) = ax^n
Now, in python use math.pow() to get the power of numbers.
- exp(): Is a natural exponent with exp(). Major difference is base being the variable, power becoming the variable.
f(x) = a^x
a can be any constant and x which is the power value, becoming the variab
The specialization in the exponential function grows rapidly as the x value increases. If the base is greater than 1, then the function continuously increases in value x increases. The slope of these functions continuously increases as x increases.
f(x) = e^x
Power Function math.pow(3,2) 9.0 math.pow(5,7) 78125.0 math.pow(5.56, 6) 29542.602396307444 math.pow(-9.54, 6) 753859.2155364405
- Square Root:
math.sqrt(5) 2.23606797749979 math.sqrt(-8) --------------------------------------------------------------------------- ValueError Traceback (most recent call last) <ipython-input-41-9f6332b1593d> in <module>() ----> 1 math.sqrt(-8) ValueError: math domain error math.sqrt(5.6) 2.3664319132398464
The square root of a number is another number which produces the first number when it is multiplied by itself. In the python math module use math.sqrt() to find the square root of any positive real number. The real number is integer or decimal and the value returned is always a float value.
No square root of negative number.
- Greatest Common Divisor(GCD):
print ("GCD of 75 and 30 is ",math.gcd(75, 30)) print ("GCD of 75 and 30 is ",math.gcd(75, 30)) GCD of 75 and 30 is 15
Also called the highest common divisor. GCD of two positive integers a and b is the largest common to a and b.For example, the GCD 12 and 60 is 6. You can divide both 12 and 60 by 6 without any remainder.
The python module provides a function math.gcd()
- Convert Angle Value
math.radians(23) 0.4014257279586958 math.degrees(23) 1317.8029288008934 math.radians(-9) -0.15707963267948966 math.degrees(-18) -1031.324031235482
Angles can be measured either by degrees or by radians. So sometimes you have to convert degrees to radians and vice versa.The python math module provides a function, you can use math.radians(). This function returns the radian value of degree input.
If you want to convert radians to degrees, then use math.degrees().
- Trigonometric Value
- SIN function-
SIN import math a = math.pi/5 a 0.6283185307179586 math.sin(a) 0.5877852522924731 math.sin(7) 0.6569865987187891 math.sin(-8) -0.9893582466233818
Cos import math a = math.pi/8 a 0.39269908169872414 math.cos(a) 0.9238795325112867 math.cos(-9) -0.9111302618846769 math.cos(7)
tan import math a = math.pi/5 a 0.6283185307179586 math.tan(a) 0.7265425280053609 math.tan(8) -6.799711455220379 math.tan(-5) 3.380515006246586
hypotenuse import math a = 5 b = 7 math.hypot(a,b) 8.602325267042627 a = -9 c = -7 math.hypot(a,c) 11.40175425099138
Arc Cos import math a = math.pi/5 a 0.6283185307179586 math.acos(a) 0.8914064000439458 Pie math.pi 3.141592653589793 r = 5 circumference = 2 * math.pi * r circumference 31.41592653589793 r = 5 area = math.pi * r * r area 78.53981633974483
Trigonometry deals with the study of triangles. It is the relationship between angles and sides of a triangle.The python math module provide useful functionality such as,
- sin value math.sin()
- cosine value math.cos()
- tan value math.tan()
- arcsin value math.asin()
- arc cosine value math.acos()
- hypotenuse value math.hypot()
Constant Math Module:
Python math modules offer constants.It is part of a mathematical function.The most useful and famous mathematical constant are as follows,
Which is defined as the ratio of the circumference to the diameter of a circle.= c / d
c = circumference
d = diameter
its value is 3.141592653589793 or 22/7.(approximately: 3.14)Pie also denotes Pi. Pi is an irrational number, which means it can not be expressed as a simple fraction.
- Euler’s Number:
Euler’s Number math.e 2.718281828459045
It is a base of the natural logarithm.Euler’s number (e) is a constant is the base of the natural logarithm.It is an irrational number with finite decimal places. The value is 2.718281828459045.
Form math module Math.e
Infinity positive_infnity = float('inf') print('Positive Infinity: ', positive_infnity) ('Positive Infinity: ', inf) negative_infnity = float('inf') print('Negative Infinity: ', positive_infnity) ('Negative Infinity: ', inf) test = float("inf") test inf
Simply it can’t be defined by a number.It is never-ending or boundaryless. It can be any direction it means positive or negative. Positive and Negative infinity in python are as follows:
- Not a Number(NaN):
NaN math.isnan <function math.isnan>
It is not related to a mathematical function, it integrated the computer science field as a reference to value the not numeric.
Python math module: math.nan