Hi all, I tried converting a large number of TH1 derivatives into JSON using ROOT.TBufferJSON.ConvertToJSON(x) (from Python) and found that the resulting JSON is mal-formed. This is due to NaN and Infinitiy values in the TH1s, especially +/-Inf is common in TProfile axis bounds. TBufferJSON repres…

Hi Marcel, Why you want to save NaN or Infinity in JSON? To my knowledge, JSON standard does not support them. Are there real use-cases - like meaningful state of any ROOT object? Regards, Sergey

Hi Marcel, I tried to check ROOT sources - there are no places where Infinity values assigned to persistent data members. Probably, you could try to avoid such values in your code - at least for case of objects which should be delivered to JSROOT. While there is no equivalent of “Infinity” and “Na…

Hi Sergey, as you might remember from the ROOT workshop [1], we are sitting on a pile of about 44e9 ROOT histograms from the last ~5 years, and I can’t really do much about what’s inside there. For the inf’s, it is quite obvious where they come from: when you have a TProfile, and don’t want to los…

[image] schneiml: I could live with these values not being handled correctly (e.g. replace them with 1e38, -1e38, 0), but I really think that JSROOT should be able to read whatever TBufferJSON produces. Yes, this can be used as workaround for infinite values. With NaNs there is no good solut…

Yes, replacing NaN with anything will screw up the semantics. Using a JavaScript null or empty object might be the most “correct” thing to do, but will be a pain to work with… Still, I think we need a way to handle this, maybe optionally.

Hi Marcel, I submit PR to solve problem with infinite values: [linev] json: differently handle infinite values by linev on 11:25AM - 21 Feb 19 UTC 1 commits changed 1 files with 6 additions and 2 deletions. I uses value 2e308 instea…

Thanks Sergey! I worked around by a bit of regex-replacing, which makes things work for now but will fail in certain cases. Good to know this can go away at some point. Cheers, Marcel

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