How to access a workspace variable from matlab app designer?

My matlab app contains a push button. in the callback function i have to access variables created in workspace.

when i tried to use the variable in callbackfunction i get the error :

undefined function or variable even though the variable defined in workspace.

Kindly help me with a solution.

[Stephen23]

Duplicate:

https://www.mathworks.com/matlabcentral/answers/337807-how-to-access-a-workspace-call-array-in-appdesigner-and-get-the-transpose-of-that