I have a line that I need to plot after another line in R such that they go over into each other. The line at the end needs to be red. How can I make sure that when I use plot(....) function for the first line and lines(....) for the second data that this second data coming from lines(....) plots at x = a instead of beginning at x = 0?
Make the values for second data from 1 to a as NA
data2[1:a] = NA
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