MATLAB Tutorials Class 2: Creation of Matrix and array in MATLAB

 MATLAB Tutorials Class 2: Creation of Matrix and array in 

MATLAB 

Hai... We addressed the environmental setup and layout configuration in my previous post. Here we going to see Matrix and array. The expansion of MATLAB is the 'Matrix laboratory'. MATLAB script operations are based on matrix and array.

1. What is the Matrix?

        The matrix is a framework for the number of columns and rows. The matrix may look rectangular or square. A count of rows and columns is used for matrix status representation ( no. of. row X no. of. column matrix). For instance, if the number of rows and columns is 3, the matrix is known as the 3 x 3 matrix. 

2. What is an array?

        An array is an arrangement of elements together in a single row.
 
3. How to create an array in MATLAB?

To do this, you can use the command window. For execution, after entering the code line, give enter. If you want to see the answer in the same command window means, you don't put the semicolon at last. Eventually, if you give a semicolon, you'll see the result in the workspace. Good practice putting a semicolon.

Array Creation in MATLAB:

Method 1: To create an array, give space or comma between each number as shown below

>> array_creation=[1 2 3 4 5 6 7]

array_creation =

     1     2     3     4     5     6     7

>> array_creation=[1,2,3,4,5,6,7]

array_creation =

     1     2     3     4     5     6     7

Method 2: It's another way to create an array. Its general syntax is 'first number: difference: last number.' If you did not mention the difference means, it will consider 1.
>> array_creation=1:10

array_creation =

     1     2     3     4     5     6     7     8     9    10

>> array_creation=1:2:10

array_creation =

     1     3     5     7     9

Matrix creation in MATLAB:

Separate rows with semicolons to create a matrix that has multiple rows.

>> matrix_creation=[1;2;3;4]

matrix_creation =

     1
     2
     3
     4

>> matrix_creation=[1,2;3,4]

matrix_creation =

     1     2
     3     4

>> matrix_creation=[1,2,3;4,5,6;7,8,9]

matrix_creation =

     1     2     3
     4     5     6
     7     8     9

How to create a zero's matrix and one's matrix in MATLAB?

Zero Matrix :

        Creates a matrix that contains zeros in full. Syntax is 

                    zero_matrix=zeros() 

case 1:if we give syntax like 'zero' means it creates 1 x 1 zero matrices.

>> zero_mat_creation=zeros

zero_mat_creation =

     0

case 2: If we mention a number, that number is considered to be a row and column count.

>> zero_mat_creation=zeros(2)

zero_mat_creation =

     0     0
     0     0

>> zero_mat_creation=zeros(5)

zero_mat_creation =

     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0

case 3: if suppose we need a specified number of row and column zeros matrix means we can mention the number of row and column as given below

zero_mat_creation=zeros(2,3)

zero_mat_creation =

     0     0     0
     0     0     0

>> zero_mat_creation=zeros(5,8)

zero_mat_creation =

     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0


Ones Matrix :

        Creates a matrix that contains ones in full. Syntax is 

                    zero_matrix=ones() 

case 1:if we give syntax like 'ones' means it creates 1 x 1 ones matrices.

>> one_mat_creation=ones

one_mat_creation =

     1

case 2: If we mention a number, that number is considered to be a row and column count.

>> one_mat_creation=ones(2)

one_mat_creation =

     1     1
     1     1

>> one_mat_creation=ones(4)

one_mat_creation =

     1     1     1     1
     1     1     1     1
     1     1     1     1
     1     1     1     1

case 3: if suppose we need a specified number of row and column ones matrix means we can mention the number of row and column as given below

>> one_mat_creation=ones(5,2)

one_mat_creation =

     1     1
     1     1
     1     1
     1     1
     1     1

>> one_mat_creation=ones(5,9)

one_mat_creation =

     1     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1     1


Identity Matrix:

A square matrix with 1s on the main diagonal, and 0s everywhere else is an identity matrix. Syntax is 

>> identity_mat_creation=eye

identity_mat_creation =

     1

>> identity_mat_creation=eye(5)

identity_mat_creation =

     1     0     0     0     0
     0     1     0     0     0
     0     0     1     0     0
     0     0     0     1     0
     0     0     0     0     1

>> identity_mat_creation=eye(3)

identity_mat_creation =

     1     0     0
     0     1     0
     0     0     1 

Note: while creating zeros, ones, and identity matrix will be in type (or class) of double. we can get another class by mentioning them. Syntax is

zeros(5,'typename')

The typename are  'double', 'single', logical, 'int8', 'uint8', 'int16', 'uint16', 'int32', 'uint32', 'int64', or 'uint64'.

>> zero_mat_creation=zeros(5,8,'uint8')

zero_mat_creation =

  5×8 uint8 matrix

   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0

>> one_mat_creation=ones(5,9,'logical')

one_mat_creation =

  5×9 logical array

   1   1   1   1   1   1   1   1   1
   1   1   1   1   1   1   1   1   1
   1   1   1   1   1   1   1   1   1
   1   1   1   1   1   1   1   1   1
   1   1   1   1   1   1   1   1   1

>> identity_mat_creation=eye(5,6,'int32')

identity_mat_creation =

  5×6 int32 matrix

   1   0   0   0   0   0
   0   1   0   0   0   0
   0   0   1   0   0   0
   0   0   0   1   0   0
   0   0   0   0   1   0

Reference:


We have discussed the matrix and array creation in Matlab so far. We will see how to generate random numbers in MATLAB.

Thank you so much😇
Please subscribe😊.
Share with your friends and please provide your feedback about this post🙏🙏.


























Comments

Post a Comment

Popular posts from this blog

MATLAB Tutorials class 4 : MATLAB command diag, det, trace

MATLAB Tutorials class 4: MATLAB command  diag, det, trace               We discussed random number generation in my previous post (rand, randi,randn function). We're going to see some interesting Matlab commands and their functions in this post. They are diag,det, and trace. First, we going to see about diag diag           By using the diag command we can create a diagonal matrix and can compute the diagonal of the matrix. Diagonal elements are one in the identity matrix(eye), but we can create our desired diagonal element by using the diag command. This is the major difference between the diagonal matrix (diag) and the identity matrix (eye). 1. How to create a diagonal matrix in MATLAB?           The syntax for creating a diagonal matrix in MATLAB is                 diag_creation=diag([1 2 3 4 5]) >> diag_creation=diag([1 2 3 4 5]) diag_creation =      1     0     0     0     0      0     2     0     0     0      0     0     3     0     0      0     0     0     4     0  
Read more

MATLAB Tutorials class 5: MATLAB inbuild command repmat,repelem,cat,horzcat, and vertcat

MATLAB Tutorials class 5: MATLAB inbuild command repmat,repelem, cat,horzcat, and vertcat           We discussed MATLAB inbuild command diag,det, and trace in my previous post . We're going to see repmat, repelem, cat,horzcat, and vertcat MATLAB commands and their functions in this post.  repmat   repmat command used to repeat the copies of the array. Syntax is repmat_value=repmat(array,no)  How to create a matrix in which all elements should be the same in MATLAB? >> repmat_value=repmat(10,4) repmat_value =     10    10    10    10     10    10    10    10     10    10    10    10     10    10    10    10 >> repmat_value=repmat(10,4,3) repmat_value =     10    10    10     10    10    10     10    10    10     10    10    10 How to repeat one matrix in square shape and rectangle shape? >> rand_matrix_creation=randi(2,3) rand_matrix_creation =      2     1     1      1     1     2      1     2     2 >> repmat_value=repmat(rand_matrix_creation,2,2) repmat_val
Read more

Improved Median filter MATLAB code and explanation ( without inbuilt function and with inbuilt function)

Image
 Improved Median filter MATLAB code and explanation ( without inbuilt function and with inbuilt function)               We looked at the salt and pepper noise and the median filter Matlab program (with inbuilt and without inbuilt function) in my  previous post . In that post, I gave the 'medfilt2' program without using the inbuilt function. While viewing the output of the medfilt2 program function, there is some noise pixel on the filtered image. And the overall image looks blurred, too, because it also modifies the noiseless pixel intensity values. This problem can be corrected to some extent by making some adjustments to the median filter. We're going to see it in this post.  Modification: 1. Instead of changing all pixel values, only the noise-affected pixel is being changed here. The noise detection stage is used to detect the noise pixel. 2. While computing median, we consider only noiseless pixels instead of taking all pixel values. i.e. we neglecting noise pixel 0 an
Read more