使用TraMineR的并行坐标图（seqpcplot）：如何表示没有任何转换的事件序列？

I'm using the R packages TraMineR to compute and analyze the event state sequences. My alphabet consists of 7 states: however, some individuals do not experience any transition along the 84 months considered, staying always in the same state. The event state sequences for these cases are, for example:I'm using the R packages TraMineR to compute an