Creating a special matrix

Hello all,

I want to create this matrix

A=[0 0 1 1 1;0 1 1 1 0;1 1 1 0 0]

How can I get ?

Thank you.

Answer 1

[Star Strider]

One way:

v = [0 0 1 1 1 ];
A = [v; circshift(v,[0 -1]); circshift(v,[0 -2])]

[Thewall]

Thanks for your answer.

However, I have many columns and rows. I think I should shift 100 times of v vector. How can I do this?

[Star Strider]

My pleasure!

Use a for loop. If all you want to do is to shift the columns as you described for each row, change my example code to the more generalised version:

v = [0 0 1 1 1 ];
nrows = 3;
for k1 = 1:nrows
    A(k1,:) = circshift(v,[0 1-k1]);
end

Change v to the vector you want, and change the number of rows you want to create (denoted here as the value of the variable nrows) to create your matrix.