How can I implement JointWorldCoordinates in matlab file for Kinect

im trying to use metaDataDepth.JointWorldCoordinates(:,:,1) line from matlab kinect tutorial but it gives me the following error:

Field reference for multiple structure elements that is followed by more reference blocks is an error.

Error in skeleton_tracking (line 70) metaDataDepth.JointWorldCoordinates(:,:,1)

[Monika]

It is because your "metaDataDepth" matrix contains many frames. You should use metaDataDepth(i).JointWorldCoordinates(:,:,1) where i is the index of your frame.