你如何使用OpenOffice Calc动态绘制图表/图表间隔数据？

I'm interested in creating one or more spreadsheet graphs of interval metered data. The raw data is recorded as a continuously increasing value (i.e. total bytes, user logins, website hits) and date. Each sample measurement date will happen at a non-constant interval. For simplicity I would like to record the data in a spreadsheet program, such as OpenOffice Calc.I'm interested in creating one or more spreadsh