> ts.plot(retr_sadj) (it is works) > ts.plot(retr_sadj, retr) (iy gives a error) Error in .cbind.ts(list(...), .makeNamesTs(...), dframe = dframe, union = TRUE) : no time series supplied PLEASE HELP ME. HOW CAN I DRAW THESE TWO THINGS ON THE SAME GRAPH? I want to prepare a combined ts plot for "retr_sadj" and "retr", but Rstudio gives an error.

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Minimum Spanning Tree

A spanning tree is a sub-graph of a connected, undirected graph. It has all the vertices of a graph with the minimum possible number of edges. If a vertex is skipped, then it will not be a spanning tree. The edges of a spanning tree may or may not have weights.