Hey , i need to get the high and low for a 30 min consolidated trade graph. I need to compare the current 30 min graph bar values with the previous 30 min graph value.COuld you please tell how to can i implement this.

As of now i am able to consolidate to 30 min bar graph,get the high low but don't know how to compare with the previous 30 min high,low.

Also how can i make time series plot for high and low so it will be good for visualization.

Thanks in Advance