Avoid for loop in matlab

Hello,

i have the following for loop and i am trying to find a way to avoid the loops and reduce the time. is it possible to calculate A and B without using a for loop ?

for i = 1:m
    for j = 1:m
        A(i,j) = A(i,j)/(sqrt(Dn(i,i)*Dn(j,j)));
    end
end
for i = 1:m
    for j=1:n
        B(i,j) = B(i,j)/(sqrt(Dn(i,i)*Dn(j+m,j+m)));
    end
end

A is an mxm matrix

B is an mxn matrix

and Dn is an NxN diagonal matrix

with N = 247 , n = N-m = 217 and m =30.

Answer 1

[Walter Roberson]

sdnd = sqrt(diag(Dn));  %gives a column vector
A = A ./ (sdnd(1:m) .* sdnd(1:m).');
B = B ./ (sdnd(1:m) .* sdnd(m+1:end).');

Requires R2016b or later.

[Pamela AL ALam]

Thank you, it works