I am having a 4 dimension .mat file
You are confusing concepts that apply to variables with concepts that apply to .mat files. Variables like x=rand(4,4,3,2) are 4-dimesional. However .mat files are files and do not have dimensions.
Perhaps you consider a .mat file to be 4D when it contains a 4D variable. That wouldn't make too much sense, because a .mat file will generally contain multiple variables of different dimensions, e.g.,
x=rand(4,4,3,2);
y=rand(5,7);
z=rand(5,5,5,3,8);
save somefile.mat x y z
My query is that when I double click it then it displays the following message
Shouldn't happen. Double-clicking a.mat file in the Current Folder window should load it into the workspace. Perhaps you meant single-click. Or, perhaps you are clicking on a file in an environment other than the Matlab Desktop.
