How to iterate an if statement condition and store values in separate columns

Question

Joy Shen 2023-3-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1921270-how-to-iterate-an-if-statement-condition-and-store-values-in-separate-columns

回答： DUY Nguyen 2023-3-2

I'm trying to calculate Esim for different boundary conditions on Fsim. The first being if Fsim is less than n_ins, the second if Fsim is between n_ins and n_tot, and the third if Fsim is above n_tot.

However, I want to have three different values of n_tot. Is there a way to calculate this piecewise function, where one of the boundary conditions has three different values? I essentially would like Esim to have three columns of data for each n_tot(i).

This is what I have so far:

Qsim=[]; Qsim=Cd.*Asim.*sqrt(2*g*(Fsim-n_ins))*Dsim;
Vsim=[]; Vsim=Qsim.*Dsim; %ft^3
n_tot=[12 13 14];
for i=1:1:3
if (Fsim < n_ins)
    Esim = 0;
elseif (Fsim >= n_ins & Fsim < n_tot(i))
    Esim(:,i)=Vsim./(int_L*int_W);
elseif (Fsim>= n_tot(i))
    Esim = int_L*int_W*int_H; % make sure this is here
end
end

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Answer 1

DUY Nguyen 2023-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/1921270-how-to-iterate-an-if-statement-condition-and-store-values-in-separate-columns#answer_1183320

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Hi,

You can try something like this! Esim will have three columns of data for each n_tot(i)

Qsim = Cd.*Asim.*sqrt(2*g*(Fsim-n_ins))*Dsim;
Vsim = Qsim.*Dsim; %ft^3
n_tot = [12 13 14];
Esim = zeros(length(Vsim), length(n_tot));
for i = 1:length(n_tot)
        if (Fsim < n_ins)
            Esim(:,i) = 0;
        elseif (Fsim >= n_ins && Fsim(j) < n_tot(i))
            Esim(:,i) = Vsim(j)/(int_L*int_W);
        elseif (Fsim >= n_tot(i))
            Esim(:,i) = int_L*int_W*int_H;
        end
    
end