How to reduce an existing matrix

I would like to reduce an existing matrix (1885x1885) to (188x188), essentially discarding the last 5 rows and columns.

How would I code this. Thanks in advance.

[Azzi Abdelmalek]

What do you mean by reduce? Please give a short example

Answer 1

[Roger Stafford]

I think you mean reduce it to (1880x1880).

 M = M(1:end-5,1:end-5);

Answer 2

[Sausan Khomusi]

Partially yes. I would like to then reduce the (1880 X 1880) matrix to every 10th row and every 10th column. making it (188 by 188).

I must have deleted that part of the question. My apologies.

Answer 3

[Roger Stafford]

 M = M(10:10:end,10:10:end);

Answer 4

[Cedric]

 buffer = M(:,1:10:end) ;
 M_reduced = buffer(1:10:end,:) ;

[Sausan Khomusi]

thank you again Cedric. This worked perfectly. I was creating a for loop and it was getting really messy.

Sausan