Finding a specific arrangement of numbers in a matrix?

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John
John 2018-1-10
评论： Stephen23 2018-1-11
Hello, how do i find a specific arrangement of numbers in a matrix?
For example, I have this matrix
0 0 0 0 0
0 1 1 1 0
0 1 1 1 0
0 0 0 0 0
How do I find the specific arrangement of
0 1 1 0
0 1
1 0
Also, I would like to change the 1's to 5

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回答（1 个）

Birdman
Birdman 2018-1-11
%finding specific arrangement of zeros and ones
Acol=diff(A);%column-wise comparison
Arow=diff(A.').';%row-wise comparison
%%finding indices of transitions
[rC0_1,cC0_1]=find(Acol==1);
[rC1_0,cC1_0]=find(Acol==-1);
[rR0_1,cR0_1]=find(Arow==1);
[rR1_0,cR1_0]=find(Arow==-1);
%replace 1 with 5's
A(A==1)=5;

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