This iExpression links a 1D property to another 1D, 2D, or 3D property. If you link the 1D property to a 2D or 3D property you can (as in any other link) choose in the options of "Link to" among other things whether you want to link to the x, y, or z component.

  • Link to

    Don't put a number here. Use the link button to link this to some property.

Simple Link 1D iExpression

can be applied to: 
1D properties
iExpression Bundle: 
Download at

What are iExpressions?

iExpressions are After Effects expressions with an easy to use interface.