创建不规则时间序列图的最简单方法（R？GGPLOT？ITS？）

I'm a graphic designer who is trying to use R to create graphs that are too complicated for Excel. I'm specifically trying to create an irregular time series step chart. I've had no problems creating a regular time series chart, but for some reason, the irregular dates are throwing everything off.I'm a graphic designer who is trying to use R t