Draw curves in matlab

I have multiple excel files.From which I want to make curves for theoratical and experimental part. I have written code in which I have made curve by import txt file and this graph contains one theoratical and one experimental curve at T=1500. But now I want to draw multiple theoratical and experimental curves from different excel files or sheets in which value of T will be change for each file. Can anayone help me to write code? I have attached matlab code.

syms x
load Book1.txt;
wave=Book1(:,1);
corr=Book1(:,2);
Efficiency=Book1(:,3);
experiment=Book1(:,4);
theoratical=Book1(:,5);
% Theoratical curve
counts=(experiment/corr);
Photoelectrons=((counts-50)*4)/5;
Photons=((Photoelectrons)*(Efficiency));
Energy =(Photons*(1240/wave));%(nm)
W=(Energy/100);
N=(W/(5.3*10^(-12)));
yyaxis left
plot(wave,N)
hold on
% experimental curve
t=100;
h=6.62e-34;%J*s
c=3e8;%m/s
k=1.38E-23;%J/K
r=26e-6;%beam radius
T=1500;
z=5.67e-8;
f=(((15*z*T)/(3.14^4))*((k*T)/(h*c))*(x^4))*(10^6);
intf=int(f);
yyaxis right
a=fplot(intf,[600 800]);

Answer 1

[KSSV]

txtfiles = dir('*.txt') ;
N = lewngth(txtfiles) ;
for i = 1:N
    load(txtfiles(i).name) ; 
    
    wave=Book1(:,1);
    corr=Book1(:,2);
    Efficiency=Book1(:,3);
    experiment=Book1(:,4);
    theoratical=Book1(:,5);
    figure(i)
    % Theoratical curve
    counts=(experiment/corr);
    Photoelectrons=((counts-50)*4)/5;
    Photons=((Photoelectrons)*(Efficiency));
    Energy =(Photons*(1240/wave));%(nm)
    W=(Energy/100);
    N=(W/(5.3*10^(-12)));
    yyaxis left
    plot(wave,N)
    hold on
    % experimental curve
    t=100;
    h=6.62e-34;%J*s
    c=3e8;%m/s
    k=1.38E-23;%J/K
    r=26e-6;%beam radius
    T=1500;
    z=5.67e-8;
    f=(((15*z*T)/(3.14^4))*((k*T)/(h*c))*(x^4))*(10^6);
    intf=int(f);
    yyaxis right
    a=fplot(intf,[600 800]);
end

[Nadia jabeen]

But value of T should be changed in each loop. Value of T is different for each excel file.

[KSSV]

Where is T present? You change it accordingle inside the loop.