TGraph2D Palette : Fix a value to a color

[ricfregian]

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ROOT Version 5.34/36
Platform, compiler gcc version 4.9.3 (GCC)

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I’m plotting many TGraph2D plots using “colz”. However for each plot the value I’m interested in changes its color in the palette (because the Palette range is changing). How can I fix a value to a color in the palette ?

[Wile_E_Coyote]

I guess you should be able to enforce the same “z-range” for all your 2D graphs. For each of them call:

SomeTGraph2D->SetMinimum(MyMinimum);
SomeTGraph2D->SetMaximum(MyMaximum);

Same color palette range for several TH3 drawn with glcolz

I once applied a “brutal fix” to such a problem. I modified all relevant histograms destroying two bins: MyHisto->SetBinContent(1, 1, MyMinimum); MyHisto->SetBinContent(MyHisto->GetNbinsX(), MyHisto->GetNbinsY(), MyMaximum);

[ricfregian]

Wile_E_Coyote I enforced the same “z-range” for all my 2D graphs and it worked.
Thanks !