How to get the previous data?

Hi,
I am monitoring a one moving point with coordinates (Xd,Yd). I want to get the two previous data so that I can calculate the point of origin as (Xo,Yo). I made a calculation that if i have three known points I will be able to get the point of origin. The variable data for the moving point (Xd,Yd) i showed using a slide bar. I want to see in the graph the moving point with the line connected to the point of origin at least.
But my problem is how can i get the two previous data correctly. Can somebody kindly teach me please.
Thank you very much.
Attachments:
moving point.vi ‏39 KB

Hi Bong,
I couldn't open your VI 'cause I'm still running LV7.11... anyway, if I understood what you're asking for, it is quite simple, you just need to drag down the shit register of the for loop as in the attached example SR.vi.
If you are not using a shit register to plot your data, then it depends on which display you use, but there are some tricks to get previous data... but in my opinion keeping a cluster with (X,Y) in a shift register is a good idea
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
SR.vi ‏19 KB

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