plotting - Why is ListPlot so slow here?

While examining How can I monitor the progress of a Plot? I was surprised to discover that in some cases ListPlot in version 10.0 and 10.1 is orders of magnitude slower than it is in version 7. This is not rendering time but generation of the Graphics itself. Here is an example.

dat = Table[{x, y}, {x, 200}, {y, RandomReal[9, 500]}];

lp = ListPlot[dat, ImageSize -> 600]

enter image description here

Rendering this plot takes only ~0.08 second according to EvaluationCompletionAction -> "ShowTiming" as seen by evaluating lp separately. However generating lp (in 10.1) is quite slow:

ListPlot[dat] // RepeatedTiming // First

2.02

This takes only 0.018 second in version 7. Why is 10.1 two orders of magnitude slower?

David Skulsky reports these AbsoluteTiming results:

MacBook Air: v8 2.1 sec, v9 0.43 sec, v10 3.6 sec.

Apparently the problem is not limited to v10 though it is most severe there. Should this not be a simple operation and much faster than this as indeed it was in version 7?

First attempt at analysis

Since no useful explanation had yet been provided I thought I would see if I could learn anything with a Trace. What I learned is that the sheer size of Trace is comically, exasperatingly large:

bigTrace = Trace[ListPlot[dat]];


ByteCount[bigTrace]

5728324392

A five and a half gigabyte trace? Really? I'll keep trying to learn more but that's just depressing. Can this be considered a bug? Someone please tell me this has been fixed after version 10.1.

Comments

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I would like to create a plot where I have unconnected dots and some connected. So far, I have figured out how to draw the dots. My code is the following: ListPlot[{{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4,13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full] I have thought using ListLinePlot command, but I don't know how to specify to the command to draw only selected lines between the dots. Do have any suggestions/hints on how to do that? Thank you. Answer One possibility would be to use Epilog with Line : ListPlot[ {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4, 13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full, Epilog -> { Line[ ...

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list manipulation - Selecting multiple columns from a matrix?

Sample data: data = { {{2013, 1, 1}, 24.13, 167.67, 231.82}, {{2013, 1, 2}, 32.15, 170.92, 225.99}, {{2013, 1, 3}, 35.43, 172.68, 221.67}, {{2013, 1, 4}, 36.73, 173.05, 218.32}, {{2013, 1, 5}, 58.19, 165.96, 197.05}, {{2013, 1, 6}, 69.99, 163.50, 187.52}, {{2013, 1, 7}, 71.37, 154.21, 175.58}, {{2013, 1, 8}, 72.51, 149.66, 163.25}}; I want a DateListPlot with three graphs, so for a matrix formed by columns 1 and 2, one for columns 1 and 3, and 1 for columns 1 and 4. At the moment I'm using this code: data2 = Transpose[{data[[All, 1]], data[[All, 2]]}]; data3 = Transpose[{data[[All, 1]], data[[All, 3]]}]; data4 = Transpose[{data[[All, 1]], data[[All, 4]]}]; DateListPlot[{data2, data3, data4}, Joined -> True, Filling -> {3 -> {1}}] but I have a hunch that this can be done more efficiently. I don't like the Transpose s in particular. Any ideas? edit (for extra credit) What if I need to multiply the second column by 2, which in my solution is simp...

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