Using an If Statement inside a While Loop

I have a code I am writing in which I need to incorporate an If statement inside of a While loop. I want my code to run equations a - d when a(2) > d and when a(2) <= d I want to pull that value out and put it into a separate vector. The issue I am having is that my loop stops after finding only one value of a(2) <= d, where I would like to find and pull out (place into separate vector) all values when a(2) <= d. Can anyone tell me what I am missing?

Pulsepileup.m :

a = rand(2,1)
b = round(a(1)*80+20)
c = find(energies100 == b)
d = spectrum100(c)

while a(2) > d
    run pulsepileup.m
if a(2) <= d
    x = b
end
end

Thank you!

Answer 1

[Joseph Cheng]

what you're missing is

x=[];
while a(2) > d
    run pulsepileup.m
if a(2) <= d
    x = [x b];
end
end

your original code stores the one value for when a(2)<=d. with the addition i made it'll concatenate to x when the condition is true.