i have a .mat file as shown.the same data is used in different .mat files.but how it is generating variable val with diiferent sizes and different info?

function importfile2(fileToRead1)
%IMPORTFILE2(FILETOREAD1)
%  Imports data from the specified file
%  FILETOREAD1:  file to read

%  Auto-generated by MATLAB on 21-Apr-2014 10:21:10

% Import the file
newData1 = load('-mat', fileToRead1);

% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
    assignin('base', vars{i}, newData1.(vars{i}));
end

[Walter Roberson]

You can check to see how data is stored in the file by using "whos" with the "-file" argument.

for example,

whos -file MyMatFile.mat

Do that for two files for which you think that data should have the same size and same type.