How to match an excel cell with a data file to create a plot

for i=1:1:50
    %randomizing the value of a between 1 to 7092
    a=randi([1,7092]);
    %making the name of the R random
    name=['R',num2str(a),'.txt'];
    %importing that randomized R text file
    data=importdata(name);
    %making the matrix into a vector
    acceleration=data(:);
    acceleration(i);
    
    %reading excel file
    excelfile = xlsread('Final_NGA_Flatfile.xlsx');
    
 
    %extracting dt from excel files
    dt=excelfile(:,4);
    %putting ft matrix into one vector 
    dtnewnew=dt(:);
   
    for n=1:size(dt)
        xvalues=dt;
        xvaluesnew=xvalues(:);
        xvaluesnewnew=xvaluesnew*(n-1);
    end 
    
    %PLOT/LABEL
plot(xvaluesnewnew,'DisplayName','xvaluesnewnew');
hold on;
plot(acceleration,'DisplayName','acceleration');
hold off;
xlabel('time');
ylabel('acceleration');
title('Earthquake Data (acceleration vs. time)');


end

I am trying to match an excel cell with data from a text file to create a plot. I want to do this with 50 excel cells, so i think i should use a loop, but i am not sure. I cannot upload the excel file and data files because there are 7000 data files.