# How to compare two arrays and logically replace elements to satisfy my condition

5 vues (au cours des 30 derniers jours)
Joy Shen le 8 Avr 2022
Commenté : Voss le 9 Avr 2022
I have two arrays that are physically related. I want to compare it column by column (ie. column 1 from array 1 compared to column 1 from array 2) and replace values in array 1 with the value of array 2 if the array 1 value is greater than the value in array 2. This logic part is seen at the end of my code
Thanks!
%% Monte Carlo Simulations for PS Flow Rate
n = 100000;
g = 32.2; %ft/s^2
Cd = 0.94; %Get engineering judgment for this
af = [0.01 0.95 0.99]; %NF, PF, CF Percentage of what is left. Differentiates damage states. this is what the flow area is
% Randomly generate flood heights for each flood height discretization bin
delta_h = [rand(n,1)*3, rand(n,1)+3, rand(n,1)+4, rand(n,1)+5, rand(n,1)+6, rand(n,1)+7, rand(n,1)+8, rand(n,1)+9, rand(n,1)+10, rand(n,1)+11, rand(n,1)+12, rand(n,1)+13, rand(n,1)+14, (rand(n,1)*5)+15] ; %Uniform random numbers from 0 to 3
Q_cf=[];
Q_pf=[];
Q_nf=[];
for i = 1:14
Q_cf = [Q_cf Cd.*sqrt(2.*g.*delta_h(:,i)).*af(3)];
Q_pf = [Q_pf Cd.*sqrt(2.*g.*delta_h(:,i)).*af(2)];
Q_nf = [Q_nf Cd.*sqrt(2.*g.*delta_h(:,i)).*af(1)];
end
Q_edges = [0 13 20 25 35];
q_cf_histcount = [];
q_pf_histcount = [];
q_nf_histcount = [];
for i = 1:14
q_cf_histcount = [q_cf_histcount; histcounts(Q_cf(:,i),'BinEdges',Q_edges,'Normalization','probability')];
q_pf_histcount = [q_pf_histcount; histcounts(Q_cf(:,i),'BinEdges',Q_edges,'Normalization','probability')];
q_nf_histcount = [q_nf_histcount; histcounts(Q_cf(:,i),'BinEdges',Q_edges,'Normalization','probability')];
end
%% Internal Flood Height
time = 3600; %Flood time duration taken as 1 hour or 3600 seconds
l_int = 25; %Length of room [ft]
w_int = 25; %Width of room [ft]
A_int = l_int*w_int;
h_int_cf = [];
h_int_pf = [];
h_int_nf = [];
h_int_cf = [h_int_cf (Q_cf.*time)/A_int];
h_int_pf = [h_int_pf (Q_pf.*time)/A_int];
h_int_nf = [h_int_nf (Q_nf.*time)/A_int];
%% Compare h_int to delta_h and replace h_int if greater than delta_h
for i = 1:14
h_int_cf = (h_int_cf(:,i)>=delta_h(:,i));
h_int_pf = (h_int_pf(:,i)>=delta_h(:,i));
h_int_nf = (h_int_nf(:,i)>=delta_h(:,i));
end
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### Réponse acceptée

Voss le 8 Avr 2022
"replace values in array 1 with the value of array 2 if the array 1 value is greater than the value in array 2"
% if array1 > array2
% array1 = array2;
% end
% therefore:
% array1 = min(array1,array2) % operates element-by-element
h_int_cf = min(h_int_cf,delta_h);
h_int_pf = min(h_int_pf,delta_h);
h_int_nf = min(h_int_nf,delta_h);
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Joy Shen le 9 Avr 2022
Thanks! nice and elegant
Voss le 9 Avr 2022
You're welcome (and thank you)!

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