1) how is your original data set out?
2) what do you mean by of the recent 300 data...? Is there a date field that drives this?
3) what do you mean by Min/Max?
do you simply mean the Max value and the Min value (just 2 points in the chart),
or do you mean the # ammount of Max values and the # amount of Min Values?
I would have a chart with x axis (time frame), and y axis (0 to 500).
is it possible to draw only the recent 500 days data each time if i were to continue adding more data. and how to set the Y axis range so that the 500 days data min and max range is drawn. (eg, if the recent 500 days data is from 300 to 500, would show only Y axis 300 to 500)