How to load a variable using MATLAB Script?

I need to load a selected variable from .mat file, using MATLAB script , and analyse it.
the attched shows my vi, there are two inputs nodes 'file' contains the .mat file path, and 'varn' contains varibale name in that .mat file which can be selected by user. Using " load(file)" the whole .mat file is loaded in the workspace and become avaiable at output node, however I am not able to pass a selected variable name through string "varn" input, MATLAB script does not recognize the variable.
any idea to reslove it is realy appreciated.
Attachments:
load a variable.JPG ‏18 KB

Download the VI and .MAT file. Run the VI, and it'll plot the data inside of the .MAT file.
Andy Chang
National Instruments
LabVIEW Control Design and Simulation
Attachments:
testfile.zip ‏5 KB

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