#31 Python Tutorial for Beginners | Working with Matrix in Python

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Matrix Multiplication Theory : https://goo.gl/omPVAS
Watch till 7:12 mins

In this lecture we will learn:
What are mutli-dimeansional arrays?
Two-dimensional array in Python
Attributes available with a two-dimensional array
How to convert the dimensions of an array
Matrix in Python
How to convert an array into a matrix?
Functions used with a matrix


#1
If a list contains multiple elements of the same type, then it is known as an array.
When an array contains another array inside it, then it is known as a two-dimensional array.
Two- dimensional array can be defined as an array within another array.
It is a collection of rows and columns.

Syntax of a two-dimensional array:-
arr= array([
[arr1],
[arr2]
])

#2
Attributes with two-dimensional arrays:-
dtype attribute returns the data type of the data with which you are working.
ndim attribute gives the number of dimensions of an array and also gives the rank to an array.
e.g, if it is a single-dimensional array then it will return 1 if three-dimensional array then it returns 3.
It will also give the rank whether it is 1-D, 2-D and many more.
shape attribute returns the number of rows and the number of columns present inside an array.
size attribute gives the size of the entire block.
flatten attribute convert the 2-dimensional array into a single-dimensional array.

#3
reshape attribute is used to change the dimensions of an array. We can convert a 1-D array to a 2-D array by using the reshape method.
reshape(r,c) method takes two parameters ie., the number of rows and a number of columns, that you want in an updated array.
reshape attribute also works with a 3-D array. In 3-D, we have multiple 2-D arrays. And a 2-D array contains multiple 1-D arrays.

#4
Matrices can be defined as a two-dimensional array that has multiple rows and columns.
A matrix that has one row and multiple columns is known as a row matrix.
A matrix having one column and multiple rows is known as a column matrix.
Both the row matrix and column matrix is in the form of a single-dimensional array.
A separate format available for a matrix in python.

#5
Functions with matrix:-
matix() attribute is used to convert an array into a matrix format.
We can also create a matrix without using an array. It can also be created directly by using the matrix() attribute.
matrix('1 2 3 6 ; 4 5 6 7')
In this, values are separated by using the space, and rows are separated by using the semicolon.
A diagonal () function can be used to only print the diagonal elements of an array.
min() function will give the minimum value element from an array.
max() function is used to get the maximum value element of an array.
There is a certain number of rules that should be followed in matrix multiplication.

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