[ROOT-8105] TFormula does not always handle 'gaus' correctly. Created: 05/Apr/16  Updated: 09/Aug/16  Resolved: 08/Aug/16

Status: Closed
Project: ROOT
Component/s: Math Libraries
Affects Version/s: 6.06/02
Fix Version/s: 6.08/00, 6.06/08

Type: Bug Priority: Blocker
Reporter: Lynn Garren Assignee: Lorenzo Moneta
Resolution: Fixed Votes: 0
Labels: None





As demonstrated below TFormula no longer support "(1-gaus)" (But still support many other usage of 'straight' 'gauss'):

root [1] f = new TF1("test","(1-gaus(0))*[0]",0,1)
(TF1 *) 0x7f9bd1dfadc0
root [2] f = new TF1("test","gaus*[0]",0,1)
(TF1 *) 0x7f9bd3c04b30
root [3] f = new TF1("test","1+gaus*[0]",0,1)
(TF1 *) 0x7f9bd1cb0110
root [4] f = new TF1("test","1-gaus*[0]",0,1)
(TF1 *) 0x7f9bd1e24970
root [5] f = new TF1("test","(1-gaus)*[0]",0,1)
input_line_31:1:82: error: use of undeclared identifier 'gaus'
Double_t TFormula____id16595312676895837307(Double_t *x,Double_t *p){ return (1-{gaus})*p[0] ; }
Error in <TFormula::Eval>: Can't find TFormula____id16595312676895837307 function prototype with arguments Double_t*,Double_t*
Error in <TFormula::ProcessFormula>: "gaus" has not been matched in the formula expression
Error in <TFormula::ProcessFormula>: Formula "(1-gaus)*[p0]" is invalid !
(TF1 *) 0x7f9bd3c0b7e0

Philippe, Lynn, Paul.

Comment by Lorenzo Moneta [ 20/Apr/16 ]

This bug is now fixed in the ROOT master version. Thank you for reporting it


Comment by Gianluca Petrillo [ 08/Aug/16 ]

The fix shows in the tag v6-06-04, but it does not show up in any of the source distributions (neither 6.06/04 nor 6.06/06).
Am I missing anything?

Comment by Philippe Canal [ 08/Aug/16 ]

The fix has been uploaded to the v6.06 patch branch and the field "Fix Version" has been filled out to reflect which version the patch will actually appear in.

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