Unsing string for indexing though structures

Hey, I would like to create a while loop with which I can read mat files one after the other and evaluate them automatically without writing a separate program for each mat file. Loading the mat files works using the loop, but unfortunately I can't access the structures with a variable s2.

Does someone have a solution for it?

i = 108;
% A = ((0.1255)/2)^2*pi;
% ml_in_m3 = 1e-6;
while i <= 108
    pfad = '...';
    s = strcat(pfad,'Test3_',string(i),'.mat');
    s2 = strcat('Test3_',string(i));
    load(s);
    figure(2)
    plot(s2.X.Data,s2.Y(8).Data)
    t = s2.X.Data;
    y = s2.Y(8).Data;
    x = 0:0.001:s2.X.Data(end);
    y=interp1(t,y,x,'spline');
    i = i+1;
end

%the error that occur is: Unrecognized method, property, or field 'X' for class 'string'.

Answer 1

[KSSV]

i = 108;
% A = ((0.1255)/2)^2*pi;
% ml_in_m3 = 1e-6;
while i <= 108
    pfad = '...';
    s = strcat(pfad,'Test3_',string(i),'.mat');
    % s2 = strcat('Test3_',string(i));
    s2 = load(s);   % <--changed here 
    figure(2)
    plot(s2.X.Data,s2.Y(8).Data)
    t = s2.X.Data;
    y = s2.Y(8).Data;
    x = 0:0.001:s2.X.Data(end);
    y=interp1(t,y,x,'spline');
    i = i+1;
end

[Jan-Philipp Göbel]

hey, thank you for the answer, but this doesnt work. I tried it, but than s2 is an struct with the form s2.Test3_... Than i have still the Problem to loop through the diffenrent names

[KSSV]

Do all mat files have same variable names?

[Jan-Philipp Göbel]

yeah, only the name of the file and the values of the variables are changing