You can iterate over fractional values:
for k = 1./(2:5)
disp(k)
end
However if you are using the k values as indices this is not possible. In this case you have two possibilities:
1) define a vector before the loop, and index into this:
V = 1./(2:5);
for k = 1:numel(V)
disp(V(k))
... code using k as an index
end
2) calculate the fractional value from k
for k = 1:4
disp(1/(k+1))
... code using k as an index
end
