How to change a row of the matrix in Matlab and Octave

To replace a single row of an array with another one in Matlab/Octave type

M(n,:)=[ k ]

• M is the name of the matrix (array)
• n is the number of the row to be replaced
• k is the list of new elements of the row

Example

Define a matrix 2x3

>> M = [1 2 3 ; 4 5 6]
M =
1 2 3
4 5 6

To replace the first row of the matrix type M(1,:)=[ 7 8 9]

>> M(1,:)=[ 7 8 9]

This command replaces the values from the first row

M =
7 8 9
4 5 6

To replace the second row of the matrix type M(2,:)=[ -1 -2 -3]

>> M(2,:)=[ -1 -2 -3]

This command replaces the values on the second row

M =
7 8 9
-1 -2 -3