Comparing values of a vector

Question

Rodrigo Pena 2021-4-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796782-comparing-values-of-a-vector

评论： Rodrigo Pena 2021-4-9

采纳的回答： Rik

在 MATLAB Online 中打开

Hello All, How are you?

I would like to compare every value of my vector x to the following statement: 0≤x≤P

If x is between 0 and P use this formula to calculate Zc

Zc = (M/P^2)*(2*P.*x - x.^2); % 0≤x≤P

If x is within P and 1, use this formula to calculate Zc

Zc = (M/(1-P)^2)*((1-2*P) + 2*P.*x - x.^2);% P≤x≤1

And I also would like to store the values of Zc from both formulas in a single variable Zc

How can I do this?

Please find the code below:

M = 4/100; % Max Camber.
P = 4/10; % Location of Max Camber.
tmax = 18/100; % Maximum airfoil thickness.
% Mean Camber Line.
x = [0:0.01:1];%chord.
if any(x == 0)
    Zc = (M/P^2)*(2*P.*x - x.^2); % 0≤x≤P
else
    Zc = (M/(1-P)^2)*((1-2*P) + 2*P.*x - x.^2);% P≤x≤1
end

Thank you in advance !

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Answer 1

Rik 2021-4-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796782-comparing-values-of-a-vector#answer_671187

在 MATLAB Online 中打开

This is the easiest way to do it vectorized:

Zc_0_to_P =@(x) (M/P^2)*(2*P.*x - x.^2); % 0≤x≤P
Zc_P_to_1 =@(x) (M/(1-P)^2)*((1-2*P) + 2*P.*x - x.^2);% P≤x≤1
x = 0:0.01:1;
%pre-allocate with NaN so we can spot skipped values (if any)
Zc=NaN(size(x));
L= 0<=x & x<=P;
Zc(L)=Zc_0_to_P(x(L));
L= P<=x & x<=1;%this overlaps with the previous condition for x=P
Zc(L)=Zc_P_to_1(x(L));