Varying variable name within one workspace

    folder = '1.5';
    load comp.mat
    figure
    L1 = L;
    J1 = J;
    clearvars -except L1 J1
    plot(L1,J1,'bo')
    hold
    folder = '1.8';
    load comp.mat
    L2=L;
    J2=J;
    clearvars -except L1 J1 L2 J2
    plot(L2,J2,'b*')

From the code above I am trying to load a group of variable with all the same name and plot them all on one graph. I have been trying to rename the variable after they load but as soon as I load a new file it replaces the previous variable. Is there anyway I could rename the variables as they are imported and stop them from being replaced by the following variable?

Also if I could maybe save the variable with the Pt in the name EG: L_'PT' which varied dependent on input. This could solve the previous problem

load workspace.mat
  prompt = 'What is the target frequency? '; %asks for values to input
  Pt = input(prompt);
  L = Pt/frequency;
  BF = 1.88;
  J = frequency/BF; 
  clearvars -except L J
  save('comp');

Answer 1

[Walter Roberson]

first = load('comp.mat', 'L', 'J');
plot(first.L, first.J, 'bo');
second = load('comp.mat', 'L', 'J');
plot(second.L, second.J, 'b*');

More generally...

dinfo = dir();
dinfo(~[dinfo.isdir]) = [];                             %zap non-directories
dinfo( ismember({dinfo.name}, {'.', '..'}) ) = [];      %zap . and ..
nfold = length(dinfo);
vars = cell(nfold,1);
folders = {dinfo.name};
for K = 1 : nfold
   thisdir = folders{K};
   vars{K} = load( fullfile(thisdir, 'comp.mat'), 'L', 'J' );
   plothandles(K) = plot(vars{K}.L, vars{K}.J, 'bo');
   hold
 end

   legend(plothandles, folders)