Dynamic array storage with for loop

18 May 2020
3 Answers
Answer Accepted
Updated 3 Jun 2020
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D = 0.067;
Ugs = [0.047,0.061,0.288,0.344,0.404,0.544,0.709,0.945,1.418,1.891,2.363,2.836,4.727];
Uls = ones(1,13)*0.047;
Uls1 = ones(1,13)*0.071;
Uls2 = ones(1,13)*0.095;
Uls3 = ones(1,13)*0.142;
g = 9.81;
rho_gas=1.18;
rho_liq=900;
Ugs_aht= Ugs *((rho_gas).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls_aht= Uls *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls1_aht= Uls1 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls2_aht= Uls2 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls3_aht= Uls3 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
print(Uls_aht, Uls1_aht,Uls2_aht,Uls3_aht)
C = ((Ugs_aht).^0.5) + ((Uls_aht).^0.5);
C1 = ((Ugs_aht).^0.5) + ((Uls1_aht).^0.5);
C2 = ((Ugs_aht).^0.5) + ((Uls2_aht).^0.5);
C3 = ((Ugs_aht).^0.5) + ((Uls3_aht).^0.5);
flow = ones(1,13);
flow = string('flow');
for i = 1:13
if C <= 0.2(i)
flow(i)= 'Bubble'
if C1 <= 0.89(i)
flow(i)= 'Slug'
if C2 <= 0.98(i)
flow(i)= 'Transition'
if C3 >= 1.00(i)
flow(i)= 'Churn'
end
end
end
end
% end
Ugs = Ugs.';
Usl = Usl.';
Usl1 = Usl1.';
Usl2 = Usl2.';
Usl3 = Usl3.';
C = C.';
C1 = C1.';
C2 = C2.';
C3 = C3.';
Uls_aht = Uls_aht.';
Uls1_aht = Uls1_aht.';
Uls2_aht = Uls2_aht.';
Uls3_aht = Uls3_aht.';
% flow = flow.';
T = table(Ugs,Uls_aht,Uls1_aht,Uls2_aht,Uls3_aht,C,C1,C2,C3)

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 Accepted Answer

Temidayo BOBOYE
Temidayo BOBOYE on 3 Jun 2020

0 votes

D = 0.067;% Diameter of tube in meters
Ugs = [0.047,0.061,0.288,0.344,0.404,0.544,0.709,0.945,1.418,1.891,2.363,2.836,4.727];
Uls = ones(1,13)*0.047;
Uls1 = ones(1,13)*0.071;
Uls2 = ones(1,13)*0.095;
Uls3 = ones(1,13)*0.142;
Uls4 = ones(1,13)*0.284;
Uls5 = ones(1,13)*0.378;
g = 9.81;% Acceleartion due to gravity (m/s^2)
rho_gas=1.18;% Gas density (Kg/m^3)
rho_liq=900;% Liquid density (Kg/m^3)
for i = 1:13
Ugs_aht(i)= Ugs(i) *((sqrt(rho_gas))/(sqrt(g * D *(rho_liq - rho_gas))));
end
Uls_aht= Uls *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht1= Uls1 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht2 = Uls2 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht3 = Uls3 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht4 = Uls4 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht5 = Uls5 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
C = (sqrt(Ugs_aht)) + (sqrt(Uls_aht));
C1 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht1));
C2 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht2));
C3 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht3));
C4 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht4));
C5 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht5));
Ugs =Ugs.';
Uls = Uls.';
Uls1 = Uls1.';
Uls2 = Uls2.';
Uls3 = Uls3.';
Uls4 = Uls4.';
Uls5 = Uls5.';
Ugs_aht = Ugs_aht.';
Uls_aht = Uls_aht.';
Uls_aht1 = Uls_aht1.';
Uls_aht2 = Uls_aht2.';
Uls_aht3 = Uls_aht3.';
Uls_aht4 = Uls_aht4.';
Uls_aht5 = Uls_aht5.';
C = C.';
C1 = C1.';
C2 = C2.';
C3 = C3.';
C4 = C4.';
C5 = C5.';
plot(C,Ugs_aht,'--r')
xlabel('C (sqrt(m/s))')
ylabel('Ugs_aht (m/s)')
title('Flooding Mechanism')
T= table(Ugs, Uls,Uls_aht, Ugs_aht, C,C1,C2,C3,C4,C5);
hold on
plot(C1,Ugs_aht,'--b')
hold on
plot(C2,Ugs_aht,'--g')
hold on
plot(C3,Ugs_aht,'--y')
hold on
plot(C4,Ugs_aht,'--c')
hold on
plot(C5,Ugs_aht,'--k')

More Answers (2)

Ameer Hamza
Ameer Hamza on 18 May 2020
Edited: Ameer Hamza on 18 May 2020

0 votes

There are several syntax errors in your code. Compare it with the following code to see the issues
D = 0.067;
Ugs = [0.047,0.061,0.288,0.344,0.404,0.544,0.709,0.945,1.418,1.891,2.363,2.836,4.727];
Uls = ones(1,13)*0.047;
Uls1 = ones(1,13)*0.071;
Uls2 = ones(1,13)*0.095;
Uls3 = ones(1,13)*0.142;
g = 9.81;
rho_gas=1.18;
rho_liq=900;
Ugs_aht= Ugs *((rho_gas).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls_aht= Uls *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls1_aht= Uls1 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls2_aht= Uls2 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
Uls3_aht= Uls3 *((rho_liq).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
C = ((Ugs_aht).^0.5) + ((Uls_aht).^0.5);
C1 = ((Ugs_aht).^0.5) + ((Uls1_aht).^0.5);
C2 = ((Ugs_aht).^0.5) + ((Uls2_aht).^0.5);
C3 = ((Ugs_aht).^0.5) + ((Uls3_aht).^0.5);
flow = strings(1,13);
for i = 1:13
if C(i) <= 0.2
flow(i) = 'Bubble';
elseif C1(i) <= 0.89
flow(i) = 'Slug';
elseif C2(i) <= 0.98
flow(i) = 'Transition';
elseif C3(i) >= 1.00
flow(i) = 'Churn';
end
end
% end
Ugs = Ugs.';
Uls = Uls.';
Uls1 = Uls1.';
Uls2 = Uls2.';
Uls3 = Uls3.';
C = C.';
C1 = C1.';
C2 = C2.';
C3 = C3.';
Uls_aht = Uls_aht.';
Uls1_aht = Uls1_aht.';
Uls2_aht = Uls2_aht.';
Uls3_aht = Uls3_aht.';
% flow = flow.';
T = table(Ugs,Uls_aht,Uls1_aht,Uls2_aht,Uls3_aht,C,C1,C2,C3)
Result
T =
13×9 table
Ugs Uls_aht Uls1_aht Uls2_aht Uls3_aht C C1 C2 C3
_____ ________ ________ ________ ________ _______ _______ _______ _______
0.047 0.058011 0.087634 0.11726 0.17527 0.28669 0.34186 0.38826 0.46448
0.061 0.058011 0.087634 0.11726 0.17527 0.29307 0.34824 0.39464 0.47086
0.288 0.058011 0.087634 0.11726 0.17527 0.35431 0.40948 0.45588 0.5321
0.344 0.058011 0.087634 0.11726 0.17527 0.36485 0.42002 0.46642 0.54264
0.404 0.058011 0.087634 0.11726 0.17527 0.37523 0.4304 0.4768 0.55302
0.544 0.058011 0.087634 0.11726 0.17527 0.39678 0.45195 0.49835 0.57457
0.709 0.058011 0.087634 0.11726 0.17527 0.41886 0.47404 0.52044 0.59666
0.945 0.058011 0.087634 0.11726 0.17527 0.44636 0.50154 0.54794 0.62416
1.418 0.058011 0.087634 0.11726 0.17527 0.4926 0.54777 0.59417 0.67039
1.891 0.058011 0.087634 0.11726 0.17527 0.53157 0.58674 0.63314 0.70936
2.363 0.058011 0.087634 0.11726 0.17527 0.56583 0.621 0.6674 0.74362
2.836 0.058011 0.087634 0.11726 0.17527 0.59687 0.65205 0.69844 0.77467
4.727 0.058011 0.087634 0.11726 0.17527 0.70049 0.75566 0.80206 0.87828

4 Comments
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Temidayo BOBOYE
Temidayo BOBOYE on 19 May 2020
Edited: Temidayo BOBOYE on 19 May 2020
Thanks for the inputs. However, the Ugs of 13 variables are to be used with each of the 4 variables of Uls( for each value of Uls 0.047,0.071,0.095 ,0.142 the corresponding 13 values of Ugs are to be used).The expected Ugs_aht should be 13 values each for the 4 values of Uls. I need to create a dynamic array that stores each value of Ugs_aht to determine the coresponding C, C1, C2 and C3.
I think a for loop might be need
for i=1:13
Ugs_aht= Ugs(i) *((rho_gas).^0.5)/(g * D *(rho_liq - rho_gas)).^0.5;
end
Walter Roberson
Walter Roberson on 19 May 2020
ndgrid() or meshgrid()
Temidayo BOBOYE
Temidayo BOBOYE on 21 May 2020
This loop should be able to store Ugs for each of the values of Uls and run the script and finally generate the table
Temidayo BOBOYE
Temidayo BOBOYE on 3 Jun 2020
D = 0.067;% Diameter of tube in meters
Ugs = [0.047,0.061,0.288,0.344,0.404,0.544,0.709,0.945,1.418,1.891,2.363,2.836,4.727];
Uls = ones(1,13)*0.047;
Uls1 = ones(1,13)*0.071;
Uls2 = ones(1,13)*0.095;
Uls3 = ones(1,13)*0.142;
Uls4 = ones(1,13)*0.284;
Uls5 = ones(1,13)*0.378;
g = 9.81;% Acceleartion due to gravity (m/s^2)
rho_gas=1.18;% Gas density (Kg/m^3)
rho_liq=900;% Liquid density (Kg/m^3)
for i = 1:13
Ugs_aht(i)= Ugs(i) *((sqrt(rho_gas))/(sqrt(g * D *(rho_liq - rho_gas))));
end
Uls_aht= Uls *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht1= Uls1 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht2 = Uls2 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht3 = Uls3 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht4 = Uls4 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
Uls_aht5 = Uls5 *((sqrt(rho_liq))/(sqrt(g * D *(rho_liq - rho_gas))));
C = (sqrt(Ugs_aht)) + (sqrt(Uls_aht));
C1 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht1));
C2 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht2));
C3 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht3));
C4 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht4));
C5 = (sqrt(Ugs_aht)) + (sqrt(Uls_aht5));
Ugs =Ugs.';
Uls = Uls.';
Uls1 = Uls1.';
Uls2 = Uls2.';
Uls3 = Uls3.';
Uls4 = Uls4.';
Uls5 = Uls5.';
Ugs_aht = Ugs_aht.';
Uls_aht = Uls_aht.';
Uls_aht1 = Uls_aht1.';
Uls_aht2 = Uls_aht2.';
Uls_aht3 = Uls_aht3.';
Uls_aht4 = Uls_aht4.';
Uls_aht5 = Uls_aht5.';
C = C.';
C1 = C1.';
C2 = C2.';
C3 = C3.';
C4 = C4.';
C5 = C5.';
plot(C,Ugs_aht,'--r')
xlabel('C (sqrt(m/s))')
ylabel('Ugs_aht (m/s)')
title('Flooding Mechanism')
T= table(Ugs, Uls,Uls_aht, Ugs_aht, C,C1,C2,C3,C4,C5);
hold on
plot(C1,Ugs_aht,'--b')
hold on
plot(C2,Ugs_aht,'--g')
hold on
plot(C3,Ugs_aht,'--y')
hold on
plot(C4,Ugs_aht,'--c')
hold on
plot(C5,Ugs_aht,'--k')

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Walter Roberson
Walter Roberson on 18 May 2020

0 votes

flow = ones(1,13);
flow = string(flow);
for i = 1:13
if C(i) <= 0.2
flow(i) = 'Bubble';
elseif C1(i) <= 0.89
flow(i) = 'Slug';
elseif C2(i) <= 0.98
flow(i) = 'Transition';
elseif C3(i) >= 1.00
flow(i) = 'Churn';
end
end

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