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As in @Stefan Kohlbrecher's answer, there's rqt_plot that supersedes rxplot (in fact, all rx tools are succeeded by rqt). Please open an enhancement request ticket here if you think it's useful to many users.
As in @Stefan Kohlbrecher's answer, there's rqt_plot that supersedes rxplot (in fact, all rx tools are succeeded by rqt). Please open an enhancement request ticket here if you think it's useful to many users.
Update)
rqt_plot does accept brancket to identify elements in the array.