Problem with logarithmic y axis in palette plot

ROOT
1

Hi,

I want to make the y-axis logarithmic in my palette plot. But making the y-axis logarithmic (c1->SetLogy()), the points in the plot looks completely different. I have attached the two plots for comparison. I tried with the latest root version. Also, I made the plot with TH2F and pcolz option reading from a 3 column data file.

Thanks a lot,
Amit

data.pdf (20.1 KB) data_logY.pdf (19.4 KB)

2

You are using the COLZ option. Each bin is drawn as a filled rectangle. The bin limits are the same in linear and log scale. So bins along the Y axis in log scale appear as rectangles. That’s normal, specially in the bottom of the decades.

3

Ok. Is there other option than colz to make same size boxes for each point or is there a way to remake same size boxes? I needed the points with logy to look like the same with no logscale on y axis.

4

I can see two ways:

  1. you draw yourself the markers at the bin center
  2. you use a TGraph2D drawn with option PCOL
5

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