for loop of vector

Hello, i have a function shown bellow called fun, i want to sample it in a 10.^-6 - 20*10.^-6 interval with 1000 samples as shown bellow.

I have tried to implement it as following with a for loop as shown bellow,but its not iterating over the range where did i go wrong?

Thanks.

c0=2.997*10.^8;
h=6.625*10.^-34;
k=1.38*10.^-23;  
n=1;
T=307;
filter=linspace(1,1,1000);
fun=@(lambda)(2*pi.*h.*(c0.^2))./((lambda.^5).*(exp((h.*c0)./(k.*T.*lambda))-1));

for k=linspace(1*10.^-6,20*10.^-6,1000);
   plank_vec=fun(k); 
end

Answer 1

[KSSV]

You need not to use loop for this:

c0=2.997*10.^8;
h=6.625*10.^-34;
k=1.38*10.^-23;  
n=1;
T=307;
filter=linspace(1,1,1000);
fun=@(lambda)(2*pi.*h.*(c0.^2))./((lambda.^5).*(exp((h.*c0)./(k.*T.*lambda))-1));
k=linspace(1*10.^-6,20*10.^-6,1000); 
plank_vec=fun(k); 

If you want to use loop:

plank_vec = zeros(1,length(k)) ; 
for i = 1:length(k) ; 
   plank_vec(i)=fun(k(i)); 
end

[fima v]

Thank you very much.