number of elements in B and I must be the same?

Hi,

For the following line of code:

for i=1:length(C_T)
   if  C_T(i) > 0.96;
      axial_induction(i) = 1 ./ (((4.*F.*cos(relative_wind)) ./ (sigma.*Cl))-1);

     else
         axial_induction(i) = 1 ./ (1+(4.*F.*(sin(relative_wind)^2)) ./ (sigma.*Cl*cos(relative_wind))); 
     end;
  end;

I am getting the following error:

In an assignment A(I) = B, the number of elements in B and I must be the same.

Error in BEM (line 79) axial_induction(i) = 1 ./ (((4.*F.*cos(relative_wind)) ./ (sigma.*Cl))-1);

I am trying to calculate 'axial_induction' at various points along a blade section and the equation which I use depends on the 'C_T' value. Could anyone please help me with this?

Answer 1

[Matt J]

It means (in this case) that the right hand side of

axial_induction(i) = 1 ./ (((4.*F.*cos(relative_wind)) ./ (sigma.*Cl))-1);

is not scalar-valued.