Mathematical Functions

Mathematical Functions:

Ex1:

>>>import math #importing math module to call its member functions ex: sqrt(),pow(),...etc

>>> a=math.sqrt(16) 

>>> print(a)

4.0

>>> b=math.pow(2,3)

>>> print(b)

8.0

>>> print(math.pow(2,4))

16.0

Ex2:

>>> a=sqrt(16) #Error bcoz we did not import the related module 'math'

>>> import math

>>> a=sqrt(16) #Error we should call this function w.r.t module name

Ex3: To use only single function from the math module

>>> from math import sqrt

>>> a=sqrt(49)

>>> print(a)

7.0

>>> 

To calculate square root value of a number, we need not develop any logic, we can simply use the sqrt() function that is already given in the ‘math’ module.

For example to calculate the square root of 16 we can call the function as sqrt(16).

Math is a module that contains several predefined functions to perform mathematical operations.

If we want to use any module in our program,

Steps:

1.   We should ‘import’ the math module

Ex: import math

2.   We can use any of the function which is available in math module.

Ex: a=math.sqrt(16)

Note1: We can refer to sqrt() from math module by writing module name before the function.

Or

import math as k

>>> a=k.sqrt(16)

>>> print(a)

4.0

Note 2:import math statement is useful to import all

the functions from math module.

Note 3: If we want to import only one or two functions from math module, we can write as like below:

from math import sqrt #this will make only sqrt() available to our program

Example:

From math import sqrt

a=sqrt(16) #ok

b=factorial(5)#error as this program only available sqrt()

Note: 4: Similarly to import more than one function, one can write like below:

from math import factorial,sqrt

a=sqrt(16)

b=factorial(5)

print(a,b)

output:

4.0 120

Related video: https://www.youtube.com/watch?v=-AJntqLTi94&feature=youtu.be

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Command Line arguments

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