Dynamic array storage with for loop

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)

Answer 1

[Temidayo BOBOYE]

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')

Answer 2

[Ameer Hamza]

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

[Temidayo BOBOYE]

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]

ndgrid() or meshgrid()

[Temidayo BOBOYE]

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]

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')

Answer 3

[Walter Roberson]

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