For loop output into array

Hi guys, I'm really puzzled why I can't seem to get the outputs of my for loop into a 1 by 12 array? The for loop is working correctly but my final line of code in the loop which is intended to get the outputs into the annual_power array. Would really appreciate it if someone could point me in the right direction!

Note: I've tried refering to this link:

https://uk.mathworks.com/matlabcentral/answers/509523-how-to-put-for-loop-outputs-into-array

but still don't seem to be able to get it to work.

annual_power=zeros(1,12);
for i=[18.7633 19.5139 18.7633 15.0107 11.2580 10.5075 11.2580 13.5096 16.5117 17.2623 18.7633]
    [power_25,speed_25] = floris(i,density,wind_direction,...
    turbine_centres,yaw_angles,diameter,power_curve,location);
    farm_power=sum(power_25);
    annual_power(i)=farm_power(1);
  
end

Answer 1

[David Hill]

annual_power=zeros(1,12);
ref=[18.7633 19.5139 18.7633 15.0107 11.2580 10.5075 11.2580 13.5096 16.5117 17.2623 18.7633];
for i=1:length(ref)
    [power_25,speed_25] = floris(ref(i),density,wind_direction,...
    turbine_centres,yaw_angles,diameter,power_curve,location);
    farm_power=sum(power_25);
    annual_power(i)=farm_power;
end

[Joe Hunt]

Thanks David I've got it working now! Much appreciated!