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I was trying to plot a vertical line using ListPlot everything works perfectly:
MassPeaks = {{9.1, 0}, {9.1, 2}};
ListPlot[MassPeaks, Joined -> True]
However, if I change ListPlot to ListLogPlot my line disappears:
ListLogPlot[MassPeaks, Joined -> True]
shows the same axes but no line. Is this a bug or I am missing something?
Since Log[0] evaluates to Infinity you need a value close to 0.
You also should specify PlotRange to get a "nice" scaling.
ListLogPlot[{{9.1, 2}, {9.1, 0.00001}},
Joined -> True,
PlotRange -> {Automatic, {0.1, 4}}]
Another possibility:
ListLogPlot[{{9.1, 2}}, Filling -> Bottom]
