Compute or recompute a selection of execution groups in your worksheet.

Select the execution groups.

On the ribbon, from the Home tab, click Execute Selection ( ).  Alternatively, press Ctrl + = (Command + =, on Mac).

Note: You may find a 2-D Math expression is executed accidentally, resulting in an error message (if it is not valid Maple syntax) or unwanted output.  For such an expression, use nonexecutable math.  For more information, see Executable and Nonexecutable Math.