How to Access Variable in MATLAB

How to access variable in Matlab?By default, MATLAB identify variable which you use as a matrix or array. So for variable which contain more than one element, addressing each element variable element in MATLAB following the following notation:
variable(line, column)

For example you can define in command window a matrix which has 3x3 dimension:

>> a = [1 3 5; 5 6 7; 8 2 4]

a =

     1 3 5

     5 6 7

     8 2 4

To access single element of matrix above as follow :

>> a(3,2)

ans =

         2

It means that you are accessing matrix element of 'a' variable in third line and second column.

To access element in the certain line as follow:

>> a(3,:)

ans =

         8 2 4

It means that you are accessing matrix elements of 'a' variable in third line. Sign double dot (:) at the matrix column means all column.

To access element in the certain column as follow:

>> a(:,3)

ans =

         5

         7

         4

It means that you are accessing matrix element of 'a' variable in the third column. Sign double dot (:) in the line means all line

To access some elements in certain line and column as follow:

>> a(1:2,2:3)

ans =

        3 5

        6 7

It means that you are accessing matrix element of 'a' variable in first to second line and in second to third column. Writing (1:2) at the line means first to second line. Writing (2:3) at the column means second to third column.