how can i put the jreftran function in loop

Hi to all Mathworks

If I want to change many variables in (jreftran function) like

[r,t,R,T,A]=rerlect_rt(l,[NaN,500,100,NaN],[1,2.9+0i,1.458+0i,1],0,0) %

this function works ,but i need to change l also ,in a loop from 400 to 800

how can I do this please

[zina shadidi]

I am trying to change the first input variable in the above function by these steps

%% Call the transfer matrix R, T, A calculator function and build spectra

%%%may be need to % Convert angle to radians

[n1]=xlsread('SiO2_n_k.xlsx');

[n2]=xlsread('TiO2_n_k.xlsx');

l= 41;

i=1:l;

n = n1(i,2);

m = n2(i,2);

W1=n2(i,1);

% Preallocate memory

R = zeros(1,l);

T = zeros(1,l);

A = zeros(1,l);

for m = 1:l

% Reflection and transmission coefficients, r, t, not used, so

% replace output with ~. Can add back in if needed.

% [r(m),t(m),R(m),T(m),A(m)]=jreftran_rt(wl(m),d,n(m,:),t0,polarization);

% full form of jreftran_rt

[~,~,R,T,A]=rerlect_rt(l,[NaN,100,500,2000],[1,2.9+0i,1.458+0i,1.5],0,0)

but I have the folowing error

Error: File: rerlect_rt.m Line: 8 Column: 22

Function with duplicate name "rerlect_rt" cannot be defined.

Error in Untitled2 (line 20)

[~,~,R,T,A]=rerlect_rt(l,[NaN,100,500,2000],[1,2.9+0i,1.458+0i,1.5],0,0)