MATLAB: Special selecting rows of a matrix

mathematicsmatlab functionmatricesmatrixmatrix manipulation

Hi. I have a matrix of size m*n.

I want to select those rows of this matrix that their value in 10th column are between 10 to 12.

How can I do that?

Thanks a lot.

Let M be the given matrix. Then do this:

p = (1:size(M,1)).';
p = p(M(:,10)<=12&M(:,10)>=10);

p will be a column vector consisting of the row indices of all rows in M in which the element of the 10th column lies between 10 and 12.

 B = [A; A(end,:)] ;

Do not use "input" as name of a variable, because it is a name of a built-in function.

in  = [2, 2, 5, 6, 6, 6, 1, 1, 1, 1, 4, 3, 3];
out = cumsum([1, diff(a) ~= 0]);
>> out = [1 1, 2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6]