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Mr.Wizard
Mr.Wizard
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I have this data:

data =
  {{{2015, 3, 25}, 130}, {{2015, 3, 26}, 132}, {{2015, 3, 27}, 
    132}, {{2015, 3, 30}, 133}, {{2015, 3, 31}, 132}, {{2015, 4, 1}, 
    131}, {{2015, 4, 2}, 131}, {{2015, 4, 3}, 131}, {{2015, 4, 6}, 
    131}, {{2015, 4, 7}, 131}, {{2015, 4, 8}, 129}, {{2015, 4, 9}, 
    132}, {{2015, 4, 10}, 133}, {{2015, 4, 13}, 132}, {{2015, 4, 14}, 
    131}, {{2015, 4, 15}, 131}, {{2015, 4, 16}, 128}, {{2015, 4, 17}, 
    125}, {{2015, 4, 20}, 127}, {{2015, 4, 21}, 127}};

I want to produce with DateListPlot an image almost like this one:

enter image description here

Almost? If there are more than one maxima or minima only the first point should be plotted.

In reality my data is much longer.

HowWhat could an elegant and efficient answer look like?

I have this data:

data =
  {{{2015, 3, 25}, 130}, {{2015, 3, 26}, 132}, {{2015, 3, 27}, 
    132}, {{2015, 3, 30}, 133}, {{2015, 3, 31}, 132}, {{2015, 4, 1}, 
    131}, {{2015, 4, 2}, 131}, {{2015, 4, 3}, 131}, {{2015, 4, 6}, 
    131}, {{2015, 4, 7}, 131}, {{2015, 4, 8}, 129}, {{2015, 4, 9}, 
    132}, {{2015, 4, 10}, 133}, {{2015, 4, 13}, 132}, {{2015, 4, 14}, 
    131}, {{2015, 4, 15}, 131}, {{2015, 4, 16}, 128}, {{2015, 4, 17}, 
    125}, {{2015, 4, 20}, 127}, {{2015, 4, 21}, 127}};

I want to produce with DateListPlot an image almost like this one:

enter image description here

Almost? If there are more than one maxima or minima only the first point should be plotted.

In reality my data is much longer.

How could an elegant and efficient answer look like?

I have this data:

data =
  {{{2015, 3, 25}, 130}, {{2015, 3, 26}, 132}, {{2015, 3, 27}, 
    132}, {{2015, 3, 30}, 133}, {{2015, 3, 31}, 132}, {{2015, 4, 1}, 
    131}, {{2015, 4, 2}, 131}, {{2015, 4, 3}, 131}, {{2015, 4, 6}, 
    131}, {{2015, 4, 7}, 131}, {{2015, 4, 8}, 129}, {{2015, 4, 9}, 
    132}, {{2015, 4, 10}, 133}, {{2015, 4, 13}, 132}, {{2015, 4, 14}, 
    131}, {{2015, 4, 15}, 131}, {{2015, 4, 16}, 128}, {{2015, 4, 17}, 
    125}, {{2015, 4, 20}, 127}, {{2015, 4, 21}, 127}};

I want to produce with DateListPlot an image almost like this one:

enter image description here

Almost? If there are more than one maxima or minima only the first point should be plotted.

In reality my data is much longer.

What could an elegant and efficient answer look like?

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Mr.Wizard
Mr.Wizard
  • 273.1k
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Source Link
eldo
eldo
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DateListPlot: Highs and Lows

I have this data:

data =
  {{{2015, 3, 25}, 130}, {{2015, 3, 26}, 132}, {{2015, 3, 27}, 
    132}, {{2015, 3, 30}, 133}, {{2015, 3, 31}, 132}, {{2015, 4, 1}, 
    131}, {{2015, 4, 2}, 131}, {{2015, 4, 3}, 131}, {{2015, 4, 6}, 
    131}, {{2015, 4, 7}, 131}, {{2015, 4, 8}, 129}, {{2015, 4, 9}, 
    132}, {{2015, 4, 10}, 133}, {{2015, 4, 13}, 132}, {{2015, 4, 14}, 
    131}, {{2015, 4, 15}, 131}, {{2015, 4, 16}, 128}, {{2015, 4, 17}, 
    125}, {{2015, 4, 20}, 127}, {{2015, 4, 21}, 127}};

I want to produce with DateListPlot an image almost like this one:

enter image description here

Almost? If there are more than one maxima or minima only the first point should be plotted.

In reality my data is much longer.

How could an elegant and efficient answer look like?