How do I used the data from multidimensional loop and put it into a new equation and display the plot?

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I got the coding below:
% creating a multidimensional array
files = dir('*txt') ; % you are in the folder with text files
N = length(files) ;
names = {files(:).name}' ;
iwant = cell(N,1) ;
for i = 1:N
iwant{i} = importdata(files(i).name) ;
end
% select which element is needed
% type iwant{i} where i refered to 1,2,3,....,n which refered to the number
% that has been assigned to each chemical element
A = input('Please enter an element in form of iwant{i}:');
% find the number of samples
n = length (A(:,1));
% step change for the wavelength
step = 0.02;
% wavelength which is at the centre
p = A(:,1);
% to make new wavelength for each of wavelength in the samples
for j=1:n
new_wavelength(j,:) = p(j)-step*10:step:p(j)+step*10;
end
format shortG
Now im stuck on how do i do another loop function to input the value i got into another equation and display it as a spectral line? This is the equation that the value should be put into and display as a result: L(lambda)=1/1+((lambda centre-lambda)/(delta lamda/2))^2 lambda centre should be that 11 column in each row and delta lambda for now is fix to 0.2.
I will attached the textfile that i used. Hope someone can help me with this.
Thank you!

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