How can I replace for loop with meshgrid?

For example,

a = zeros(20,100);
b = rand(20,100);
for m = 2:20
    for n = 2:100
        a(m,n)=b(m-1,n)+1;
    end
end

Using FOR loops is not efficient.

Can loops be replaced with meshgrid?

Thank you.

Answer 1

[madhan ravi]

You don't need a meshgrid to do the task:

[ m, n ] = size( b );
d = zeros( m, n );
d( 2 : m, 2 : n ) = b( 1 : end - 1, 2 : end ) + 1