Problem With Plotting a graph

Hi,
I need help plotting a graph.
The situation is .... I have data of speed against time. Data is like this : a truck runs at some speed until 10 o clock. Now the driver changes time of the speed vs. time tracking device back to 9 o clock. Now if I plot this data it becomes a invalid graph as between 9 - 10 I will be having two values for the speed.
I thought of a solution that when ever a time change occurs I will drop the speed to 0 and again start plotting the graph with next point on the scale of x axis with the new set time ...... Is this possible ?
Please help.
Thanks and regards
Anirudh

Hi,
Here is a photo of what I want to do with the graph.
Here as the values that i am mappinng on x axis are repeated the graph is not one to one. Now to make it look like a one to one i want to drop it zero at the first 6. the restart the scale after 6 as 5 and continue mapping. Is this possible ?? ??
Thanks and Regards,
Anirudh.
Attachments:
tr1.JPG ‏113 KB

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