The following code is correct?

I have a Ph of size 139 48 101 values ranging say 0 to 0.4, now to compute Kd from Ph have two equations if Ph is equal or less than 0.35 and if Ph is greater than 0.35. I used following code to apply two equation. Have I done it correctly?

Kd = zeros(size(Ph));
% Find indices where Ph is less than or equal to 0.35
indices1 = Ph <= 0.35;
% Find indices where Ph is greater than 0.35
indices2 = Ph > 0.35;
% Apply the first equation to 'kd' where PhiE is less than or equal to 0.35
Kd(indices1) = 38.18.*(1-3.39.*Ph(indices1)+1.95.*Ph(indices1).^2).*1e9; 
% Apply the second equation to 'kd' where Ph is greater than 0.35
Kd(indices2) = exp(-62.60.*PhiE(indices2)+22.58).*1e9;

[Dyuman Joshi]

"Have I done it correctly?"

Yes. Your code looks good.