Left and right sides have different number of elements

Getting an error in line 5 of my script,

counter=1;
for R_e=linspace(1*10^3,1*10^5,10)
    k=linspace(1*10^-6,1*10^-3,10);
    f(counter)=pipe(R_e,k);
    counter=counter+1;
end

This is where I am calling my function (seen below), but I am getting an error that the left and right sides have a different number of elements. I need to fun my function for all values of R_e and k (to get 100 f values total), not sure my script will do that properly because it is getting stuck trying to call the function. I have done something similar in the past and cannot figure out where I messed up.

function f=pipe(R_e,k)
dh=0.1;

guess_f=64/R_e;
f1=(2*log((2.51/R_e*(guess_f).^0.5)+((k/dh)/3.72))).^-2;
df=0.1;
guess_f=guess_f+df;
f2=(2*log((2.51/R_e*(guess_f).^0.5)+((k/dh)/3.72))).^-2;

change_in_f=abs((f1-f2)/f1);
f2=guess_f+change_in_f;

while change_in_f>=1e-5
    f=(2*log((2.51/R_e*(f2).^0.5)+((k/dh)/3.72))).^-2;
    change_in_f=abs((f-f2)/f);
    f2=f;
end

end

Answer 1

[Star Strider]

Both ‘R_e’ and ‘k’ are (1 x 10) vectors, so ‘f’ will also be a (1 x 10) vector.

Try this:

f(counter,:)=pipe(R_e,k);

With that change, your code ran without error for me.

Experiment to get the result you want.