Behaviour of TTree::ReadFile()

[jfcaron]

Re: your issue 1:

I already raised this a while ago, but it received no attention. Bug in TTree::ReadFile
I also filed an official bug about it: sft.its.cern.ch/jira/browse/ROOT-5471

Perhaps adding information/comments to the bug tracker will make it more interesting to work on.

Re: your issue 2:

The way ROOT deals with infinity or NaN values is not consistent. I have made two previous posts about it in different contexts:

Inf/NaN in Histograms and TTrees

I have frequently run into a problem when using TTrees as outputs of some analysis code, when a given branch has indeterminate status. Typically I put a “nonsense value” like -999 for integers, but I have to be careful that the value I choose is indeed “nonsense” for the quantity in question! It would be useful if there was a standard non-value to put into TTrees for this purpose. I thought about using the existing inf/nan values for floating point numbers for this, but it seems ROOT behaves …

Request: Make Draw commands ignore +/-inf and NaN for axes

I often encounter data that contains a mix of valid values and +/-inf or nan values. For example I have a ROOT::Math::Interpolator with data points taken from a file covering a range, and if I construct a TF1 from this object, I need to carefully set the range, because the Interpolator returns NaN outside of the data range. If the range is not set properly I get the common “Inf/NaN propagated to pad” warning and a blank canvas. Unfortunately for me, the Interpolator provides no way to access …

Again, they didn’t get much attention.

Jean-François