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As an alternative to the openvar function, double-click a variable in the Workspace browser.
openvar('name')
openvar('name') opens the workspace variable name in the Variable Editor for graphical editing, where name is a one or two-dimensional array, cell array, structure, or an object and its properties. You can also view the contents of a multidimensional array.
The MATLAB software does not impose any limitation on the size of a variable that can be opened in the Variable Editor. Size is limited only by the operating system or the amount of physical memory installed on your system.
For some toolboxes, openvar instead opens a tool appropriate for viewing or editing that type of object.

Viewing and Editing Workspace Variables with the Variable Editor in the MATLAB Desktop Tools and Development Environment Documentation.
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