Discretize and categorize data

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Hello,

I have two arrays of same size with values ranging from 0-1. I want to first discretize the values in each array and hten create a new array that give all possible combination a unique value, something like

classes(a ==1 & b ==1 ) = 1;

classes(a ==1 & b == 2) = 2;

...

classes(a == 7 & b ==7) = 49;

My dummy code is not working the way I want, all values in 'classes' remain 0. Where am I messing this up? Thanks.

a = rand(10);
b = rand(10);
c = 1:49;
c = flipud(reshape(c,[7 7])');
edges = linspace(0,1,7);
d = discretize(a,edges);
e = discretize(b,edges);
classes = zeros(size(a));
for i = 1:7
    for j = 1:7
        classes(a == i & b == j) = c(i,j);
    end
end