Vectorization

Dear Community,

Let say I have Matrix M. In Matrix M, each Column is feature of Image. Now what I want to get a binary matrix B by following way.

for given image feature i:

B(1,i) = M(1,i) >= M(2,i);

its mean for each image feature, each cell is compared to its next cell. I want to do it without loops for speed.

[Oleg Komarov]

"Without loops for speed" is really not the right statement anymore.

Many times loops are much faster is correctly set up.

Answer 1

[Oleg Komarov]

diff(M) <= 0

Answer 2

[Jan]

B = (M(1:end-1, :) >= M(2:end, :));

[Jan]

It is worth to investigate the similarities and differences to Oleg's (faster) solution.

[Aravin]

Jan, Oleg worked on my small examples. I could find any dissimilarity. If you have in your mind then please share.

Thanks for your help too.