How to reduce an existing matrix

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Sausan Khomusi
Sausan Khomusi 2013-8-4
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.

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采纳的回答

Roger Stafford
Roger Stafford 2013-8-4
I think you mean reduce it to (1880x1880).
M = M(1:end-5,1:end-5);

更多回答（3 个）

Sausan Khomusi
Sausan Khomusi 2013-8-4
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.
Roger Stafford
Roger Stafford 2013-8-4
编辑：Roger Stafford 2013-8-4
M = M(10:10:end,10:10:end);
Cedric
Cedric 2013-8-4
buffer = M(:,1:10:end) ;
M_reduced = buffer(1:10:end,:) ;
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Sausan Khomusi
Sausan Khomusi 2013-8-4
thank you again Cedric. This worked perfectly. I was creating a for loop and it was getting really messy.
Sausan

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