The following code is correct?

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Ahmed
Ahmed 2024-3-5
移动：Dyuman Joshi 2025-9-13
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;

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回答（1 个）

Karan Singh
Karan Singh 2025-1-31
Hi Ahmed,
Everything seems to be in order here. The code you provided has a typo in the second equation where you mistakenly used "PhiE" instead of "Ph." Is "PhiE" something different? Otherwise, everything seems fine. Your use of ".*" and ".^" is correct for element-wise operations, which is necessary given that "Ph" is an array.

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