# Copy Upper Triangle To Lower Triangle In A Python Matrix || Google Interview Questions | python matrix

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## Copy Upper Triangle To Lower Triangle In A Python Matrix || Google Interview Questions

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Python Program to find Sum of Lower triangular elements in a matrix
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## Python program for left array rotation

In this video, you will learn a python program for left array rotation
You will learn how to shift elements towards the left in an array using loop by n elements.
source code : https://github.com/TheProgrammingPortal/python_examples
Steps:
1. declare an array with some elements using list and number of shifts.
2. print each element of list using for loop iteration over list
3. create a function which will rotate arrays by n elements.
4. print array after rotation using list iteration
In this video you will learn:
how to declare array using list
how to create a function
print elements of list using for loop
shifting array elements
passing parameters in function
Arrays in python
list in Python
len() function
for loop
array rotation program for a given array by n elements.
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## Python Tutorial – Python Numpy Array Multiplication

This is a quick tutorial on python arrays or matrices multiplication. This goes through creating two arrays and multiplying them together. np.array() is how matrices or arrays are formed in Python. It is important to make sure the matrices are shaped the proper way. You can check this by using the np.shape() function. To change a shape of a matrix you can use np.reshape(). The @ symbol allows you to do matrix multiplication, but make sure the dimensions are right to avoid errors.
This is a Python anaconda tutorial for help with coding, programming, or computer science. These are short python videos dedicated to troubleshooting python problems and learning Python syntax. For more videos see Python Help playlist by Rylan Fowers.

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In python we will import numpy as np
To define an array we type np.array
parentheses, bracket to start the matrix, then another bracket to enter the first row. After each row close with a bracket. At the end close the entire matrix with one more bracket and finally close your parentheses
This is what the array will look like when you print it out
We will save this 3×3 array as x
Here we are reshaping our x matrix to be a one long matrix that is 1 row by 9 columns
This is important to do sometimes because In matrix multiplication, the dimensions need to line up. An easy way to remember how to know if the dimensions will work is to look at the number of columns of the first matrix (or second dimension number) and the number of rows of the second matrix (or first dimension number). Those numbers need to be the same for it to work
Now I have defined a y matrix so we can see multiplication.
Notice the x is shaped (3,3) and the y is (3,2) since 3=3 we can do this multiplication, but only if we do x first then y
To multiply you can use the @ symbol.
There you have it, that is how you multiply matrices or arrays in python
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## #31 Python Tutorial for Beginners | Working with Matrix in Python

Matrix Multiplication Theory : https://goo.gl/omPVAS
Watch till 7:12 mins
Python Tutorial to learn Python programming with examples
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## How To Take Matrix Input From The User And Display The Matrix In Python

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User Define Function To Print Matrix

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