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To find the size of the matrix (i.e., the number of rows and columns), enter:

size(M)

gives

ans =
35

To view a particular element, for example, the (2, 4) element, enter:

M(2,4)

gives

ans =
23

To view a particular row such as the 3 row, enter:
rd
M(3,:)

gives

ans =
31 37 41 47 53

th
To view a particular column such as the 4 column, enter:
M(:,4)

gives

ans =
7
23
47

If we wanted to construct a submatrix of the original matrix, for example,
nd
rd
one that includes the block from the 2 to 3 row (included) and from the 2 nd
column to the 4 column (included), enter:
th
M(2:3,2:4)

© 2001 by CRC Press LLC