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Consider a set of data {{x,y}}. How to plot it in the way such that for all x > x0 the plot line will be solid, while for x < x0 it will be dashed?

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You can use Mesh and MeshShading:

SeedRandom[1]
data = SortBy[RandomReal[10, {50, 2}], First];
x0 = 3;
ListLinePlot[data,  
 Mesh -> {{x0}}, 
 MeshShading -> {Dashed, Dashing[{}]}, 
 PlotStyle -> Thick, 
 MeshStyle -> Opacity[0]]

enter image description here

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  • $\begingroup$ Thank you! Does this work with ListLogPlot? $\endgroup$ – John Taylor Feb 11 at 18:28
  • $\begingroup$ @JohnTaylor, it does if you add the option Joined->True. Try ListLogPlot[data, Joined -> True, Mesh -> {{x0}}, MeshShading -> {Dashed, Dashing[{}]}, PlotStyle -> Thick, MeshStyle -> Opacity[0]] $\endgroup$ – kglr Feb 11 at 18:33
  • $\begingroup$ Thank you again! Sorry again, but could you please tell how to plot two datasets data1, data2 and apply the meshing only to one of them? $\endgroup$ – John Taylor Feb 11 at 19:27
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    $\begingroup$ @JohnTaylor, you can plot the two datasets separately and combine them using Show. $\endgroup$ – kglr Feb 11 at 19:41

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