Lab1 Ex4
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Ex4. Arrays and Matrices (29 marks)
(Ex4_4 is tested separately since its mark number is significantly higher than Ex4_1 through Ex4_3. The file name for this problem should be lab4.m
.)
Ex4_1. Changing elements of a matrix (4 marks)
Get a matrix from user input, change its 4th through 6th elements to 0, 1 and 2 respectively, and print the modified matrix. If the matrix has less than 6 elements, print Invalid input
.
Hint: Search the documentation for size()
and numel()
.
Note: An array is also considered a matrix with only one row.
Notice what has been changed! Think about what the 4th element of a matrix is.
Sample Test Case
Input:
[100:115]
Output:
Columns 1 through 13
100 101 102 0 1 2 106 107 108 109 110 111 112
Columns 14 through 16
113 114 115
Input:
[1 2 3 4; 5 6 7 8]
Output:
1 2 1 4
5 0 2 8
Ex4_2. Taking a part of a matrix (5 marks)
Print as a matrix the intersection of row 2 to 5 and column 3 to 6 of a given matrix obtained from user input.
Sample Test Case
Input:
magic(7)
Output:
7 9 18 27
8 17 26 35
16 25 34 36
24 33 42 44
Ex4_3. Matrix reshaping (5 marks)
Get an integer n
from user input and output a square matrix with 1, 2, ..., n on the first row, n+1, n+2, ..., 2n on the second, and so on.
Hint 1: Use reshape()
.
Hint 2: What is the transpose of a matrix and how is it done in MATLAB? Notice the result of reshape()
's orientation.
Sample Test Case
Input:
6
Output:
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
25 26 27 28 29 30
31 32 33 34 35 36
Lab1 Exercises
- Status
- Finished
- Problems
- 5
- Open Since
- 2022-05-19 18:15
- DDL
- 2022-05-21 00:00
- Extension
- 24.0 hour(s)