RI Y2 CEP Lesson 8 Slides 2020

Lesson 82 Dimensional Array – Nested Lists

A table with 4 rows and 4 columns

Representing . . . A table with 4 rows and 4 columns25518518502559618518525501859625518518596We can represent a table with n rows and m columns into a n by m matrix.25518525596185018518525502551851859618596n rows (horizontal)by m columns (vertical)

A Matrix to a 2 dimensional array[[255,185,185,0], [255,96,185,185], [255,0,185,96], [255,185,185,96]]Nested lists in Python: a list in a list 25518525596185018518525502551851859618596

Lesson Objective•manipulate two dimensional array : nested lists•using matrix as example

Notation of Matrix

Operations and Methods to Matrices•print•finding maximum•addition , subtraction•scalar multiplication•transpose•matrix multiplication (if possible)

creating a null matrix : matrix with all 0creating a m row by n column null matrix •if m = n, the matrix will be square•a matrix need not be square this does not work. Why?so how?

printing a matrixprinting a matrix row by row: