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Mathmore affects result of ROOT::Fit, Roofit results unaffected

Hello, I am fitting background data with polynomial + exponential model using ROOT::Fit, and I have older results of the same fit performed by Roofit. With very basic installation of ROOT, the parameters obtained with ROOT::Fit are different by 6% - 9% with respect to the original Roofit results. If I run ROOT::Fit with an instance of root compiled with Mathmore library, the difference is significantly smaller - of the order of 0.3%. The Roofit result remains unaffected regardless of whether Mathmore is included or not. I cannot figure out where the Mathmore could be interfering in ROOT::Fit, can someone please point me to the correct direction?


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ROOT Version: 6.18
Platform: Centos 8
Compiler: gcc


Hi

This could be due to the numerical integration algorithm, the default one in ROOT could have some problems in same case. The one in Mathmore instead is superior

Lorenzo

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