Error: Attempted to access recap(227,1); index must be a positive integer or logical.

Hey, I got the above error on this code. What is strange is that it fills the array until it gets to 227, where it fails. I have no idea why. Any help is appreciated.

Umin  = sqrt(Lift*2/(rho*CL*b*c));
recap = zeros (250,2);
Umin = round(Umin*10)/10;

recap(227,1) = 5;

for v = Umin:0.1:25

      Lift = 0.5*rho*v^2*CL*b*c;
      Drag = 0.5*rho*v^2*CD*b*c;

      theta = atan((Lift-m*g)/Drag); %radians
      num = v*10;

      recap(num,1) = v;
      recap(num,2) = theta;
  end

Answer 1

[Image Analyst]

Try this:

num = round(v*10);

Then see these 2 FAQ entries:

http://matlab.wikia.com/wiki/FAQ#How_do_I_fix_the_error_.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22.3F

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[Mic]

this worked. Thanks so much, and that second article explained why. 2 for 2.

[Image Analyst]

Can you mark it as "Accepted" then? Thanks in advance.