在Matlab中查找矩阵中相同元素的起始索引和结束索引

Question

I want to get the start index and end Index of the same repetitive Element in a matrix? for example this Matrix:

the result will be:

zero is not considered

Answer 1

You can go this way (example for 1):

a = rem(find(A==1),5)
a(a==0)=5;
startidx = min(a)
endidx = max(a)

The same way change A==1 to whatever you need and you'll get the result. You also can create a function with parameters A, number_you_want_to_find . There are some ways to improve this code, for example instead 5 use size(A,1) and maybe there is some way to replace all this code with one line, but this works too!

Hope, it was helpful!