To generate matrix from an array

Let say I have A=[1; 2; 3; 4; 5; 6; 7; 8] as a single column array. and i want to generate the matrix B and matrix C such that

B=[1 2 3; 2 3 4; 3 4 5; 4 5 6; 5 6 7; 6 7 8]. %if repeation of last two elements of previous row is carried out%

C=[1 2 3 4; 2 3 4 5; 3 4 5 6; 4 5 6 7; 5 6 7 8; ] %if repeation of last three elements of previous row is done% and so on

Please help me to code this.

Answer 1

[Adam Danz]

Use implicit expansion. (starting r2016b)

B = A(1:end-2) + (0:2);  %assuming A is a column vector
C = A(1:end-3) + (0:3);  %assuming A is a column vector

[brijesh soni]

Many Thanks!

Answer 2

[Jos (10584)]

More general, using indexing:

A = [1 22 3 44 55 666 7 888 9]
n = 2 
B = A(((1:numel(A)-n).' + (0:n)))