Plotting the radius of a sphere

Hello all, I have produced an animation of a fireball using the comet3 function (see code and question below)

   kt = 'Please enter the yield in kilotonnes you wish to test: ';
   kt = input(kt);
  Fireball = 'Your fireball volume for your chosen yield: ';
      if (kt<=1);
          fireball_radius1 = 60;
      elseif(kt<=2>=1);
          fireball_radius2 = 80;
      elseif(kt<=3>=2);
          fireball_radius3 = 90;
      end
  z = linspace(-1,1,5000);
  r = sqrt(1-z.^2);
  t = linspace(0,150*pi,5000);
  x = r.*cos(t);
  y = r.*sin(t);
  comet3(x,y,z)

I want the fireball radius to be 60, 80 or 90 dependant on which section the yield the user inputs falls into. How do I re-call the radius values? So for example if the user inputs a value of 1.5Kt the radius of the fireball needs to be 80Km. How is this recalled to plot that value. Thanks

Answer 1

[Walter Roberson]

kt<=2>=1 means the same as ((kt<=2)>=1) . The first part of it will evaluate to 0 (false) or 1 (true). You are then testing whether 0 >= 1 (which is false) or 1 >= 1 (which is true), so this test is the same test as kt<=2 .

MATLAB does not have any range comparison operators. Very few programming languages do.