Noticed you used a reserved keyword, 'distance', in the first xvibrate. To 
avoid conflict the usual practice is to use capital letters for your 
identifiers, so Distance would be okay. Oh, and there is also a missing ')' 
after frequenci.

Tried the second equation (one with cos instead of cosd) and it seems to do 
what it probably should be doing; although, at damping=5 it ends very 
quickly, only 1/4 of the way into animation. By using 1.5 it seemed to last 
3/4 through the animation of 100 frames.

Bob H.

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