Decimal increments in a for loop

Hello, I am trying to make a for loop in which i goes up by decimal increments and for each value of i (1, 1.1, 1.2, 1.3) a different value for a function is calculated and stored. I am aware that there are such threads already existing but none of them actually seem to solve the problem. My code so far looks like that:

z = 1:0.1:100;
for i=1:length(z)
  if i<10
      y(:,i) = function of i
  elseif (10<=i)&&(i<50)
      y(:,i) = another function of i
  elseif (50<=i)&&(i<=100)
      y(:,i) = another function of i
  end
end

The problem with that is that i does not actually go up by 0.1, it goes up by 1, and the function calculates values for i equal to 1,2,3,... etc I want it to take i=1, calculate the value of y for that, then take i=1.1, calculate the value for that etc.