Help using While loop

Hello. As an extra credit for my MatLab class, I must make a program that uses both For loop and While loop to take user input into a function, and return with a final value (see attached code). I can make it run logically without a while loop. Im looking for an idea of where I should put the While loop and what it should be looking for.

clc
clear

Na = input('Enter Sodium Oxide Content (%)');
Ca = input('Enter Calcium Oxide Content (%)');
Si = input('Enter Silicon Oxide Content (%)');
Batch = [Na,Ca,Si];
p = input('Batch weight in grams');
MM = [61.977;56.077;60.083];      %Provided MolarMass Values
TG = [1.710;1.780;1.000];         %Provided Thermo Values


%--------------------------------------------------------------------
if sum(Batch) <100                %Ensures It is 100%
    disp('Error - Total Content is Not 100%')
    disp(sum(Batch))
elseif sum(Batch)>100             %Ensures it is 100%
        disp('Error - Total Content is Not 100%')
        disp(sum(Batch))
    end
    if p <= 0                     %Ensures the Batch isnt a negative weight
        disp('Batch Weight is Invalid - Check for negative value')
    end
    if sum(Batch) == 100 && p > 0 %If 100% and Pos. Batch value then it does the calculations 
        W = Na*MM(1,1,1);
    Q = Ca*MM(2,1,1);
    E = Si*MM(3,1,1);
    NewB = [W,Q,E];
    FWB1 = (W/sum(NewB))*p*TG(1,1,1);
    FWB2 = (Q/sum(NewB))*p*TG(2,1,1);
    FWB3 = (E/sum(NewB))*p*TG(3,1,1);
    R = [FWB1,FWB2,FWB3];
    Y = sum(R);
    end

    
    disp(FWB1)
    disp(FWB2)
    disp(FWB3)
    disp('Total Batch Weight (g):')
 disp(Y)

Please let me know any ideas or reccomendations of what to do here

Final note - I tried to make the while loop use the "sum(Batch) == 100 && p > 0" but that doesnt logically make sense nor work in this"*

Answer 1

[Geoff Hayes]

Charles - I think that you could use a while or for loop on this code

W = Na*MM(1,1,1);
Q = Ca*MM(2,1,1);
E = Si*MM(3,1,1);
NewB = [W,Q,E];
FWB1 = (W/sum(NewB))*p*TG(1,1,1);
FWB2 = (Q/sum(NewB))*p*TG(2,1,1);
FWB3 = (E/sum(NewB))*p*TG(3,1,1);

Note how you extract the first, second, and third element from MM for three different calculations. This suggests that a loop could be used here especially since you have already put your Na, Ca, and Si into the Batch array. For example,

NewB = zeros(length(MM),1);
for k = 1:3
    NewB(k) = Batch(k) * MM(k);
end

Then do something similar for the FW calculations.

[Charles Duggan]

clc
clear

Na = input('Enter Sodium Oxide Content (%): ');
Ca = input('Enter Calcium Oxide Content (%): ');
Si = input('Enter Silicon Oxide Content (%): ');
Batch = [Na,Ca,Si];
p = input('Batch weight in grams: ');
MM = [61.977;56.077;60.083];      %Provided MolarMass Values
TG = [1.710;1.780;1.000];         %Provided Thermo Values
k = [1,2,3];

%--------------------------------------------------------------------
if sum(Batch) <100                %Ensures It is 100%
    disp('Error - Total Content is Not 100%')
    disp(sum(Batch))
elseif sum(Batch)>100             %Ensures it is 100%
        disp('Error - Total Content is Not 100%')
        disp(sum(Batch))
    end
    if p <= 0                     %Ensures the Batch isnt a negative weight
        disp('Batch Weight is Invalid - Check for negative value')
    end
    if sum(Batch) == 100 && p > 0 %If 100% and Pos. Batch value then it does the calculations 
       NewB = zeros(length(MM),1);
       k = 3;
while k > 0
    NewB(k) = Batch(k) * MM(k);
    k = k-1;
end 
       FWB = zeros(length(NewB),1);
       l = 3;
    while l > 0
        FWB(l) = NewB(l)/sum(NewB)*p*TG(l);
        l = l-1;
    end
    end
    
    disp('Sodium Oxide Weight(g)')
    disp(FWB(1))
    disp('Calcium Oxide Weight(g)')
    disp(FWB(2))
    disp('Silicon Oxide Weight(g)')
    disp(FWB(3))
    
    disp('Total Batch Weight (g):')
    disp(sum(FWB))

In case anyone was wondering how this looked in the very end. It needs refinement to make it look a litle nicer but its running correctly.