can not load mat file correctly

How to make the function load_dataset below return x value of 2 ?

Thanks

S

>>clear all;
>>x=2;y=4;
>>save('test.mat');
>>x = load_dataset('test.mat','x');
>>x
x =

x

----

function dataset = load_dataset(cfmat,dataset)

try 
    load(cfmat,deblank(dataset));
catch
    dataset=[];
end

Answer 1

[Ilham Hardy]

Why not use load('test.mat','x')

Answer 2

[Image Analyst]

Try something like this (untested):

function storedDataset = load_dataset(cfmat, dataset)

try 
    storedStructure = load(cfmat); 
    % Check to see if the requested field exists in the structure.
    tf = isfield(storedStructure, dataset)
    if tf
        % The field exists. Use dynamic fieldname to extract it.
        storedDataset = storedStructure.(dataset);
    else
        storedDataset  = [];
    end
catch ME
    warningMessage = sprintf('%s\n', ME.message);
    fprintf('%s\n', warningMessage);
    uiwait(warndlg(warningMessage));
    storedDataset =[]; 
end