MATLAB: I am having trouble with the if cycle.

Question

kontrl = 3.197442310920451e-14
if kontrl>=-10^-20 & kontrl<=10^-20
  a = 4
  else 
  a = 10
end

% "a = 4" should be.

Answer 1

No, that is not correct. "a=4" is given only for values that are in the range +/- 1/10^20 but your value is more than 3000000 times larger than the upper end of that, at roughly +3/10^14