If part of While loop not executing any functions

VR = input('Input value of rated voltage of (VR) of 3-phase induction motor being tested: ');
IR = input('Input value of rated current (IR) of 3-phase induction motor being tested: ');
Pact = input('Input value of active/real power (Pact), or press enter if N/A: ');
Pre = input('Input value of reactive power (Pre), or press enter if N/A: ');
Papp = input('Input value of apparent power (Papp), or press enter if N/A: ');
PF = input('Input value of power factor (PF), or press enter if N/A: ');

*All of the above input values were imputted except for Papp & PF which were just left blank for calulation in the while loop

*Pact & Pre are 1-column arrays respectivly

while PF == isempty(PF)
    if  all(Pact ~= isempty(Pact)) && and(Pre ~= isempty(Pre))
        break
    end
    Papp = sqrt((Pact.^2)+(Pre.^2));
    PF = Pact./Papp;
end
Pin = (VR).*(IR).*sqrt(3).*(PF);

But when I execute the loop the values for Pin, Papp, & PF are still shown in the workspace as [ ] and are empty. I've tried all sorts of different combinations does anyone know how i can fix this???

Answer 1

[Taylor]

You're never entering the loop. You will only ever enter that loop if PF = 0 because isempty(PF) will always yield 0 if a value is present. If no value is given for PF, isempty will yield 1, but the overall logical for entering the while loop will be 0.