How to find the location of values in larger arrays where the value to the right is greater

I am struggling to develop a way of creating a matrix which displays the locations of when the value to the right is greater than the value itself. I want an output array of 1's and 0's to be displayed - 1 if the value to the right is greater

e.g. for the matrix:

20 10 10 10 10 10
10 10 -3 10 10 10
10 20 10 10 20 -6
10 10 20 10 10 10
20 10 10 10 10 25

I would like a script which writes when the value to the right is greater (displayed by a '1'):

0 0 0 0 0 0
0 0 1 0 0 0
1 0 0 1 0 0
0 1 0 0 0 0
0 0 0 0 1 0

What would the script look like, if instead a larger value to the left is required?

Thanks for any answers :)

Answer 1

[Guillaume]

Use diff on rows for that. diff will be positive for values that are greater on the right. To get a matrix the same size as the original, just concatenate a column of 0 to the right:

m = [20 10 10 10 10 10
     10 10 -3 10 10 10
     10 20 10 10 20 -6
     10 10 20 10 10 10
     20 10 10 10 10 25];
g = [diff(m, 1, 2) > 0, zeros(size(m, 1), 1)]

Answer 2

[Azzi Abdelmalek]

out=[diff(a,[],2) zeros(size(a,1),1)]>0

[Oliver]

Thank you, how about if I want the value to the left to be greater?

Thanks

[Azzi Abdelmalek]

   out=fliplr([diff(fliplr(a),[],2) zeros(size(a,1),1)]>0)

%or

   out1=[ zeros(size(a,1),1) diff(a,[],2) ]<0