Marker size according to data points

wellatiger · February 12, 2020, 7:46pm

Dear experts,

Is it possible to draw a graph where the each data point has a different size!?
As can be done in pyplot scatter plot.

Thank you in advance,

pamputt · February 12, 2020, 8:53pm

To achieve such plot, I would say you should define a TMultigraph that includes several TGraph. Each TGraph with a SetMarkerSize with a different value. I did not try but it should work.

couet · February 13, 2020, 9:13am

ROOT is fexlible enough to produce easily a such plot with a simple macro.
In graphsizemarker.C (503 Bytes) I wrote a small generic function doing that. You can copy and use it in your code.

wellatiger · February 13, 2020, 9:40am

Many thanks for the suggestion and the code

OSchaile · February 13, 2020, 11:00am

Hi,
in case you want to profit of a real TGraph (fitting etc)
you can do the att trick:
graph_var_points.C (678 Bytes)
Draw an invisible graph and overlay with markers of your choice.

Otto

couet · February 13, 2020, 12:13pm

Thanks Otto. This one makes it a bit more modular. graph_var_points.C (883 Bytes)

wellatiger · February 13, 2020, 7:09pm

Interesting, Many thanks