After reading the MATLAB Matrix topic, you will understand how to create and manipulate Matrix in MATLAB.
A MATLAB-vector is a one-dimensional array whereas matrix is a two-dimensional array of numbers. Square brackets are used for defining Vector and Matrix in MATLAB. The semi-colon is used within the square brackets for separating the rows. Space or comma used within the square brackets for separating the elements.
MATLAB – Selecting a single Element of a Matrix
The general form is:
c = x(i,j)
The variable c stores the element at position ith row and jth column of vector or matrix x.
Example
Aim (1): To extract the element present at 2nd row and 1st column of matrix x as shown below
Program (1):
x = [2,3,4;1,2,34;11,22,324] c = x(2,1)
Output (1)
c = 1
MATLAB – Selecting the complete row of Matrix
In some cases, for analysis purpose, we need to select either a complete row or column of the matrix. Selecting the complete row of a Vector or Matrix. The general form is:
c = x(i,:)
The variable c stores complete ith row of vector or matrix x.The colon used for performing this operation and here the meaning of the colon is “to select all”.
Example
Aim (1): To extract the 2nd row of matrix x as shown below
Program (1):
x = [2,3,4;1,2,34;11,22,324] c = x(2,:)
Output (1)
x = 2 3 4 1 2 34 11 22 324 c = 1 2 34
MATLAB – Selecting the complete column of Matrix
The general form is:
c = x(:,j)
The variable c stores the complete jth column of a vector or matrix x.The colon used for performing this operation and here the meaning of the colon is “to select all”.
Example
Program (1): To extract the 1st column of matrix x as shown below
x = [2,3,4;1,2,34;11,22,324] c = x(:,1)
Output (1)
x = 2 3 4 1 2 34 11 22 324 c = 2 1 11
