#31 Python Tutorial for Beginners | Working with Matrix in Python
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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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@dipbhowmik4583 3 жыл бұрын
I have watched several python basic courses online. But none of them discussed array or specially multidimentional array using numpy in python. But this dude talked about each and every single topic from python. He is freaking awesome ! Seriously!! These things are specially added in premium courses of python may be! Anyway respect Sir. Highly appreciate your efforts .
@jayanthkumar5238 3 жыл бұрын
i am in final year. i will pay you the fees for this when i get my first salary of my first job. THANKS!
@mukulyadav9011 2 жыл бұрын
Given are 2 similar dimensional numpy arrays, how to get a numpy array output in which every element is an element-wise sum of the 2 numpy arrays? pls help me with this
@madisettykeerthi8574 2 жыл бұрын
@@mukulyadav9011 i guess, m3=m1+m2
@sr-ju4lq 2 жыл бұрын
@@mukulyadav9011 it is shown in last video
@sharad3295 2 жыл бұрын
@@mukulyadav9011 or you can use for loop to do
@emna904 Жыл бұрын
I wish all the best for you
@praanshugrover_98 4 жыл бұрын
Code: from numpy import * print("Data for matrix 1") x = int(input("Enter the length of rows of array")) y = int(input("Enter the length of columns of array")) matrix1 = zeros([x, y], dtype=int) for i in range(x): a = array([]) for j in range(y): element = int(input("Enter the element of array")) a = append(a, element) matrix1 = append(matrix1, [a], axis=0) for i in range(x): matrix1 = delete(matrix1, 0, 0) print("Entered matrix is: ") print(matrix1) print("Data for matrix 2") c = int(input("Enter the length of rows of array")) if y == c: d = int(input("Enter the length of columns of array")) matrix2 = zeros([c, d], dtype=int) for i in range(c): a = array([]) for j in range(d): element = int(input("Enter the element of array")) a = append(a, element) matrix2 = append(matrix2, [a], axis=0) for i in range(c): matrix2 = delete(matrix2, 0, 0) print("Entered matrix is: ") print(matrix2) matrix3 = zeros([x, d], dtype=int) for i in range(x): for j in range(d): for k in range(c): matrix3[i][j] += matrix1[i][k] * matrix2[k][j] print("Matrix after multiplication: ") print(matrix3) else: print("Multiplication not possible as columns of matrix 1 is not equal to rows of matrix 2") Output: Data for matrix 1 Enter the length of rows of array2 Enter the length of columns of array3 Enter the element of array1 Enter the element of array2 Enter the element of array3 Enter the element of array4 Enter the element of array5 Enter the element of array6 Entered matrix is: [[1. 2. 3.] [4. 5. 6.]] Data for matrix 2 Enter the length of rows of array3 Enter the length of columns of array2 Enter the element of array7 Enter the element of array8 Enter the element of array9 Enter the element of array10 Enter the element of array11 Enter the element of array12 Entered matrix is: [[ 7. 8.] [ 9. 10.] [11. 12.]] Matrix after multiplication: [[ 58 64] [139 154]]
@mitachowdhury2423 Жыл бұрын
😂
@danielkamau8436 4 жыл бұрын
waoh!! what a good class about matrices, am a new learner with completely no knowledge of coding and learning this through personal initiative but I bet am growing in some good speed, courtesy of Navin. I pray GOD never to lack something for us your trainees
@ajeettharu1785 4 жыл бұрын
You are the best teacher of python , i have ever seen sir ji .....feeling happy to watch your python series
@aniketatole2936 2 жыл бұрын
Yes!!
@mukulyadav9011 2 жыл бұрын
Given are 2 similar dimensional numpy arrays, how to get a numpy array output in which every element is an element-wise sum of the 2 numpy arrays? pls help
@samgilchrist5583 2 жыл бұрын
@@mukulyadav9011 Take for Example One Dimensional Numpy Array ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- from numpy import * arr1 = array([1,4,3,7]) # 1st Array arr2 = array([5,3,8,1]) # 2nd Array arr3 = arr1 + arr2 # This will add element-wise as u said print(arr3) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Output:- >>> [6 7 11 8] This is also Know as "Vectorised Operation" He Literally Mentioned about this in the Previous Video (#30) .See from 1:35
@yashsolanki3339 4 жыл бұрын
Hi Navin Sir ! I'm yash from Ahmedabad I'm really enjoying the series of python in the condition of lockdown and I'm about to finish in some days, WHAT I WANT TO TELL YOU IS! please you also teach us Machine learning too !! I know there are lots of International institutes who teaches data science and machine learning but i had experience form one the institution and that was bad, and i realized they doing just job they actually not intrested to teach which I've noticed, NOW, WHEN IT COMES TO YOU.! It' seems like you're enthusiastic towards teaching us with lots of energies and fun and that's how we can learn, no matter we're not getting certificates here but what really important is KNOWLEDGE, and in the series of python i realized you're really a worth teacher to gain the knowledge So please I'm requesting you to teach us machine learning! And Thank you so much for sharing your KNOWLEDGE here !! Lots of love and wishes to you and your family ❤❤❤
@raghavarora8422 2 жыл бұрын
You r the finest teacher of python as im from civil enginerring and got placed in It company...and the way u taught that made me pro in python
@RhoChalmers 3 жыл бұрын
OMG... you are so young in the matrix multiplication video. Thank you for these python & math videos!
@Siddharth-uo6zw 4 жыл бұрын
When I saw you I remember Mr.Satya Nadela I will pray to god and support you through donations and watching ads without skipping any ad so, that you will be able to make a huge IT Company in India you are fabulous sir.
@your-Space 4 жыл бұрын
So kind you are 😘
@erenxpro099 5 жыл бұрын
Sir m really glad. The way in which you teaches is really very amazing. You put your hard work for making this video, thank you so much for that. ☺️
@deepakreddyt 4 жыл бұрын
you are explaining every concept with good examples and ideas really thanks a lot.
@ishansaha6299 6 жыл бұрын
You python tutorial is best of all waiting for further upload
@mortezaoskuei9738 5 жыл бұрын
from numpy import * arr1=array([ [1,2,3], [4,5,6]]) arr2=arr1.reshape(3,2) arr3=ones((2,2)) for i in range(2): for j in range(2): c=0 for k in range(3): f=arr1[i][k]*arr2[k][j] c=c+f arr3[i][j]=c print(arr3)
@mogalheena7875 4 жыл бұрын
The way u teach is really awesome sir. Thank you sir
@pranjalisuryavanshi9698 3 жыл бұрын
Thank you so much sir !! You teach Python in most easiest & fun way .
@reksmeyok1957 5 жыл бұрын
the best and enthusiastic video explanation
@boooringlearning 3 жыл бұрын
you are indeed an excellent teacher of Python!
@rosia1948 4 жыл бұрын
Thankyou bro... U r the best teacher of coding☺️.... superb explanation 👌👌
@jitendrachaudhary6271 4 жыл бұрын
Thank you sir for this tutorial I really like the way you teach
@ayushmadhu2680 4 жыл бұрын
Sir, I have become a fan of yours.🙌🙌
@prasantaiimk 3 жыл бұрын
Excellent. Provided explanation is spot on and very clear
@054_ritesh3 4 жыл бұрын
Awesome teaching skills, You are one of the best teachers I have ever seen!!!! 👍👍👍
@njabulomahlalela2912 2 жыл бұрын
Spot on !!!!
@chessbd Жыл бұрын
so precious and thanks for your power tutorial......hats off to you and your team!
@halawatulquran2479 4 жыл бұрын
Sir IAM wounder to see your way of explanation with fun and creating more interest in subject
@faizelahi4147 6 жыл бұрын
This is one of the best platform on the KZfaq to learn programming Thank you telusko learning
@subaananthanam6019 3 жыл бұрын
Amazing sir. Could you please explain how to include an unknown variable like x or y in a matrix?
@yashjadhav3974 3 жыл бұрын
arr2.reshape(2,2,3).........explanation: 2 array that contains 2 sub array of 3 element each
@nikhilnale4549 4 жыл бұрын
Ty's to making this series oh python ... It really help me to learn python
@manojhegde9786 2 жыл бұрын
your lectures are so good , iam enjoying the way you teach python.
@b.sasikumar2141 4 жыл бұрын
Ur one the best attribute having person for python sir tq sir..... 🙏🙏🙏
@sriramamara5100 3 жыл бұрын
your explanation was so good through practically................
@varshithathalavai2477 Жыл бұрын
Hi sir Ur teaching is awesome and I have a question after watching all ur sessions I used to think that I need memorize certain functions what u have thought during the class
@MrABhitechq 4 жыл бұрын
thanks sir, you video have been very helpful. Can you include machine learning also if possible.
@javedansari3016 3 жыл бұрын
7:55 I like the way of correction of mistake, in mind something and uttering something
@bhavani9873 3 жыл бұрын
You are really a very good teacher , sir 👍👌👌👌👌👌💐
@Malin_Music 4 жыл бұрын
Sir your videos are really helpful 😊! How does python assigns index in a 2-D array?
@AlladiBalaji- 4 жыл бұрын
What a casual explanation sir
@user-kq5zy9mu6c 4 ай бұрын
Respected sir, You are very brilliant. You are covering each and every topics on python. I support you.
@ponnapallinagasindhu1922 Ай бұрын
you mirrored your video at 8:31 to make us understand for diagnol elements.......WOW, SUCH A WONDERFUL TEACHER U R! 🙌
@santoshkumarpandit7101 4 жыл бұрын
Clear and nice explanation... 🙂
@snehalbhamare8326 4 жыл бұрын
Thank you sir..you have explained every concept very well..
@saikumarpulicharla9483 5 жыл бұрын
Multiplication of two matrices m1 ( m * n ) and m2 ( n * o ) output m3 ( m * o) from numpy import * m1=matrix('1,2,3;2,3,4;5,6,7') m2=matrix('2;4;6') m3=zeros((len(m1[:,1]),len(m2.T))) if len(m1.T) != len(m2[:,0]): print('wrong dimensions') else: for i in range(len(m1[:, 1])): for j in range(len(m2.T)): a = array(m1[i, :]) b = array(m2[:, j].T) m3[i, j] = sum(a * b) print(m3)
@hritekuthaiah995 4 жыл бұрын
Thanks brother
@AnjaliSingh19171 4 жыл бұрын
Bro what does this( len(m1[:,1]) )means
@nishantsharma2447 5 жыл бұрын
thank you very much for your free training.. :)
@aakashverma8602 5 жыл бұрын
means the parameter we give should be equal to length of the 1-D array when multiplied with each other
@KuldeepSharma-ni3rv Жыл бұрын
hello @Telusko, you explained well and things are clear. i have a ques how to append or remove value in multidimensional array
@rohitshah8904 4 жыл бұрын
Ur python series are amazing💕
@HarpreetSingh-yw4ln 4 жыл бұрын
Hi navin Can you please make videos on graphs and implementation using python I really like your approach and way of teaching please make video on graphs
@rashmikattimani9478 3 жыл бұрын
Loving the Course !!!!!
@BwithGadgets 5 жыл бұрын
Hello, If we use Jupyter Notebook then some of the operations shown in this video doesn't work. Also, it automatically does the deep copy while we copy the array using the method shown in video. Please, specify these points as well to avoid confusion. Thanks
@kittuak7938 Жыл бұрын
Sir please continue making videos on different types of modules libraries and packages by different types of numerical examples in python
@pradeepganesh712 5 жыл бұрын
Can someone explain why has a semicolon been used after the matrix multiplication statement?
@puspajha7371 2 жыл бұрын
Thank you so much sir. Your videos are really great.
@GerardFunClub Жыл бұрын
This is so helpful!!!
@bhavnarathod5120 Жыл бұрын
Best lectures.Thankyou Sir for creating such videos.
@behzadsalimianrizi4239 5 жыл бұрын
Hi, I want to create an 2-Darray with sin and cos. Could you help me how to creat it? Thanks
@rajkumarsubramani8784 Жыл бұрын
Your videos all are awesome. It will help all people who try to learn python Thank you so much sir
@easydatascience2508 Жыл бұрын
Hei , sir, you can see mine too. The channel has both Python Crash course tutorials, and R beginning course tutorials. All the videos have source files downloadable, you can check in the description of the video. Hope they will be useful.
@user-lx4xw6nh7k Жыл бұрын
easy to understand keep going on ahead
@sarthakhaldar9107 4 жыл бұрын
Please do a video on various 2D array operations using two for loops in python. I am stuck on hourglass problem in hackerrank
@onkaryende2334 3 жыл бұрын
Sir similarly can u pls make a series on c++ Your teaching ideology is just great and better than other
@nikhildhongdiya1586 3 жыл бұрын
Yes sir
@abhi-ww5ux 6 ай бұрын
decent video on python
@rutikpatil6758 4 жыл бұрын
Sir thank you so much for this wonderful series of python you are the best teacher I love your teaching
@thomaslau2362 3 жыл бұрын
Hi Mr Navin, i got one question and hope that you could address that. For the matrix multiplication what is the scenario that we will actually be using. For statistical calculations?
@divyanshupandey8150 3 жыл бұрын
Well he didn't.
@harshwardhansingh617 4 жыл бұрын
Hey sir, my confusion is why have you gave the semi-colon after the operation of matrices i.e., m3 = m1* m2; ??
@prasunmondal4572 5 жыл бұрын
By taking user input and using inbuilt numpy library: import numpy as np from numpy import * import mathematics as ma print(" .........Enter the 1st matrix.........") print() print("Enter the no of rows: ",end=" ") rows1=int(input()) print("Enter the no of column: ", end=" ") columns1=int(input()) m=[] print("Enter all the elements of the matrix following rows to column: ") for i in range(rows1*columns1): x=float(input()) m.append(x) fmatrix1=np.array(m) m1=fmatrix1.reshape(rows1,columns1) print() print("The 1st Matrix is: ") print(m1) print() print(" .........Enter the 2nd matrix.........") print() print("Enter the no of rows: ",end=" ") rows2=int(input()) print("Enter the no of column: ", end=" ") columns2=int(input()) n=[] print("Enter all the elements of the matrix following rows to column: ") for i in range(rows2*columns2): y=float(input()) n.append(y) fmatrix2=np.array(n) m2=fmatrix2.reshape(rows2,columns2) print() print("The 2nd Matrix is: ") print(m2) print() print() print("The multiplication of two matrices is: ") ma1=matrix(m1) ma2=matrix(m2) ma3=ma1*ma2 print() print(ma3) print() print(np.dot(ma1,ma2))
@StayInBliss 4 жыл бұрын
enjoying your work thanks bro
@sayedrezaomid1305 4 жыл бұрын
Thank s it was really a wonderful training Mr.Navin
@nithyashreenaidu8357 4 жыл бұрын
thank you so much it is really helpful
@fahmeedaahmed7238 4 жыл бұрын
Please upload video if user initializes value or dynamic allocation of values of matrix and then multiplication
@joenieakilimali9720 3 жыл бұрын
thank you sir ,, how can we fill the 2D array , getting size of the array and the value to fill from users
@vakhariyajay2224 2 жыл бұрын
Thank you very much. You are a genius .
@muvvalamounika4300 4 жыл бұрын
Can you help with python interview questions
@rupeshthakur3754 4 жыл бұрын
the same thing i.e. for matrix multiplication we have written multiple lines of code..but that thing is very easy in python.
@apurvabokil4329 5 жыл бұрын
hi, will you please help me with the difference between matrix and multidimensional array in numpy?
@soumadip_skyy_banerjee 4 жыл бұрын
Thankkeewww so much ♥
@randeeprana5622 3 жыл бұрын
Owsm video🔥🔥😍 Good Job sir🔥🙏
@shubhamsinha373 4 жыл бұрын
You are the best bhaiya. Love u 💓
@pranjalisuryavanshi9698 3 жыл бұрын
Kindly please tell me which written notes /book/ pdf should I refer to enhance skills of Python
@dhrubajyotiray5955 5 жыл бұрын
superb bro.. plz make a videos on ansible and jenkins also
@kramatqureshi5188 4 жыл бұрын
i want to apply max min product function on two fuzzy matrices. how i can do that in python? both matrices are 16*16.
@saurabhsharma-wg4lc 4 жыл бұрын
Can you please let know, if there is a way to append value in 2d array in python
@d-zone6418 5 жыл бұрын
Can I know how to give input from key board to multiply two matrices.
@swapnilbharude5236 4 жыл бұрын
Hey Navin, I think in the latest update numpy has deprecated i.e. it do not recommend the use of matrix and warns that it would be removed in future
@-ECE--VIGNESHN 3 жыл бұрын
Yes bro ur right
@ashwaniyadav3661 6 жыл бұрын
i love all your videos and waiting for next
@vinothe3502 5 жыл бұрын
Hi Navin.. how to give user input to 2d or 3d array.. it is possible.. I done some research.. it is mentioned that we have to get the list and reshape it to 2d or 3d.. can't we directly give user input to 2d array
@saddamahmad2310 6 жыл бұрын
thank you sir for this video
@florbertbierton9782 3 жыл бұрын
thank you telusko!!!
@JaiHind0502 2 жыл бұрын
Superb concept 🍾🥳👏🏻👏🏻
@just_a_living_being 6 жыл бұрын
from numpy import * array1 = zeros((3, 3)) array2 = zeros((3, 3)) print('Enter 9 value in first matrix: ') for i in range(3): for j in range(3): array1[i][j] = int(input()) print('Enter 9 value in second matrix: ') for i in range(3): for j in range(3): array2[i][j] = int(input()) for i in range(3): for j in range(3): m = 0 for t in range(3): m = m + array1[i][t] * array2[t][j] print(m, end=' ') print()
@ashwaniyadav3661 6 жыл бұрын
its sure work :)
@voalcalisticTanmay 6 жыл бұрын
great! can be enhanced more by making it more user friendly and removing ambiguity a bit more. Thank you.
@0712prasad 5 жыл бұрын
what if the matrix is not uniform i.e one is 3*3 and other is 3*4 how to multiply them??
@naturearoundme5686 5 жыл бұрын
Iam learning theory from navin sir and code form u great!
@vimalraj4846 5 жыл бұрын
Can you explain m=m+array1[i][t]*array2[t][j]
@AlladiBalaji- 4 жыл бұрын
What are the best tips to crack python interview questions sir
@KUNDALIK_UZ 2 жыл бұрын
Very very amazing video.thanks you very much
@rahatahmed9678 5 жыл бұрын
Thank You So Much
@AkashKumar-mw3bp 4 жыл бұрын
Sir, I have a problem regarding matrix and I am unable to solve the same please help me out. we have two matrices say A and B such that A[i,j] and B[[2,3],[3,4]] I want to multiply these matrices so that the values of matrix A runs over a given range say i=1to10 same for j.
@c_19_amangurumukhi40 3 жыл бұрын
great job sir...
@shivaprasadmallikarjunaiah3751 Жыл бұрын
You wanted to know did I enjoy this video? ...Absolutely YES from the moment you said "Welcome back Aliens" to "Buh-byeeeee" 😀
@ravikumarpawar2406 2 жыл бұрын
it's a great place to learn the technologies
@tengo2437 5 жыл бұрын
This is amazing tutorial. Easy way to learn python. I learn more from your tutorial and share with my all friends.Thank you telusko.
@soumyadas9939 3 жыл бұрын
Is there any way to remove the third brackets from the output matrix?
@AmanSingh-cq6yi 5 жыл бұрын
Very helpful,,,nyc
@mxcripto8040 2 жыл бұрын
Any tutorials on how to parse a list of arrays or list of matrices in python? I have a list of 10 arrays of 4x4 size and I am generating a random number, this random number I want to see if it is in the first row of any matrix on the list, and if it is there, I want to know wich matrix it is in and start a counter for that matriz saying that it has found a number.
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