splitting a periodic sweeping matrix

I have a matrix that goes from a negative value to a positive value through 0 and then from a positive value to negative value . This is repeated for 100 times. How do i divide the matrix so that i get all the negative sweeps in one matrix and all the positive sweep in another. For example see the attached file.

Answer 1

[Matt J]

    neg=A(A<=0);
    pos=A(A>0);

[DebiPrasad]

hey Thanks Matt, but i don't need the matrix to be only containing negative and positive values, but sweeps. What i mean is first vector will have values -2 to 2 thats a sweep . another vector will contain the sweep of 2 to -2.

[Matt J]

idx=diff(A)>0;
idx=[idx(1), idx];

pos_sweeps=A(idx);
neg_sweeps=A(~idx);