Problem by creating Sub Matrices
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I have 5x5 matrix.I want to create 6 submatrices of order 3x3.Uploaded the pic please any one can do it.Or any other methods to do this operation.Thanks
采纳的回答
The more that you set up before the loop, the neater and clearer the code will be:
mat = reshape(1:25,5,5).'; % input matrix, any size
%
blkR = 3; % output block rows
blkC = 3; % output block columns
stpR = 2; % step size rows
stpC = 1; % step size columns
%
inSz = size(mat);
vecR = blkR:stpR:inSz(1); % blocks' end rows
vecC = blkC:stpC:inSz(2); % blocks' end columns
%
numR = numel(vecR); % count blocks along rows
numC = numel(vecC); % count blocks along columns
out = cell(numR,numC);
for kR = 1:numR
for kC = 1:numC
idxR = vecR(kR)+(1:blkR)-blkR; % row indices
idxC = vecC(kC)+(1:blkC)-blkC; % column indices
out{kR,kC} = mat(idxR,idxC); % use indices
end
end
and checking the output:
>> out{:}
ans =
1 2 3
6 7 8
11 12 13
ans =
11 12 13
16 17 18
21 22 23
ans =
2 3 4
7 8 9
12 13 14
ans =
12 13 14
17 18 19
22 23 24
ans =
3 4 5
8 9 10
13 14 15
ans =
13 14 15
18 19 20
23 24 25
>>
更多回答（1 个）
MSP
2017-8-25
clear all
a=magic(5)
shiftr=2
shiftc=1
k=1
rowsize=3
colsize=3
for i=1:shiftr:size(a,1)
if i+rowsize-1>size(a,1) %%check whether b matrix indices is within a If not then break-i loop
break
end
for j=1:shiftc:size(a,2)
if (j+colsize-1)>size(a,2)
break
else
b(:,:,k)=a(i:i+rowsize-1,j:j+colsize-1)
k=k+1;
end
end
j=1;
end
This is the most basic format of doing it.Have a look and ask if u don't understand.
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