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[hist] raise error of when axis edges are inf/nan #20201

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[hist] raise error of when axis edges are inf/nan #20201

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2a5f2a6
[hist] raise error when inf/nan edges in TAxis of fixed binwidth
ferdymercury Oct 26, 2025
88bfedb
[hist] do not support infinite bin edges even if variable binwidth
ferdymercury Oct 27, 2025
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26 changes: 23 additions & 3 deletions hist/hist/src/TAxis.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
#include "snprintf.h"

#include <iostream>
#include <cmath>
#include <ctime>
#include <cassert>

Expand Down Expand Up @@ -779,10 +780,20 @@ void TAxis::SaveAttributes(std::ostream &out, const char *name, const char *subn

////////////////////////////////////////////////////////////////////////////////
/// Initialize axis with fix bins
///
/// An error is printed if xup or xlow are infinite/nan
/// (due to resulting undefined fixed bin width)
///
/// Set xup <= xlow to force the axis range and number of bins to be automatically
/// deduced after buffer is full or BufferEmpty is called

void TAxis::Set(Int_t nbins, Double_t xlow, Double_t xup)
{
fNbins = nbins;
if (std::isinf(xlow) || std::isinf(xup))
Error("TAxis::Set", "fixed binwidth not compatible with infinite lower/upper edges");
if (std::isnan(xlow) || std::isnan(xup))
Error("TAxis::Set", "lower/upper edges should not be NaN");
fXmin = xlow;
fXmax = xup;
if (!fParent) SetDefaults();
Expand All @@ -791,17 +802,26 @@ void TAxis::Set(Int_t nbins, Double_t xlow, Double_t xup)

////////////////////////////////////////////////////////////////////////////////
/// Initialize axis with variable bins
///
/// An error is printed if bin edges are not in strictly increasing order
/// or if any of them is infinite or nan

void TAxis::Set(Int_t nbins, const Float_t *xbins)
{
Int_t bin;
fNbins = nbins;
fXbins.Set(fNbins+1);
for (bin=0; bin<= fNbins; bin++)
for (bin = 0; bin <= fNbins; bin++) {
if (std::isinf(xbins[bin])) {
Error("TAxis::Set", "infinite bin edges are not supported. Use a large number instead.");
} else if (std::isnan(xbins[bin])) {
Error("TAxis::Set", "bin edges should not be NaN");
}
fXbins.fArray[bin] = xbins[bin];
}
for (bin=1; bin<= fNbins; bin++)
if (fXbins.fArray[bin] <= fXbins.fArray[bin - 1])
Error("TAxis::Set", "bins must be in increasing order");
Error("TAxis::Set", "bin edges must be in increasing order");
fXmin = fXbins.fArray[0];
fXmax = fXbins.fArray[fNbins];
if (!fParent) SetDefaults();
Expand All @@ -819,7 +839,7 @@ void TAxis::Set(Int_t nbins, const Double_t *xbins)
fXbins.fArray[bin] = xbins[bin];
for (bin=1; bin<= fNbins; bin++)
if (fXbins.fArray[bin] <= fXbins.fArray[bin - 1])
Error("TAxis::Set", "bins must be in increasing order");
Error("TAxis::Set", "bin edges must be in increasing order");
fXmin = fXbins.fArray[0];
fXmax = fXbins.fArray[fNbins];
if (!fParent) SetDefaults();
Expand Down
2 changes: 1 addition & 1 deletion hist/hist/src/TH2Poly.cxx
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Expand Up @@ -146,7 +146,7 @@ times, it is better to divide into a small number of cells.

TH2Poly::TH2Poly()
{
Initialize(0., 0., 0., 0., 25, 25);
Initialize(0., 0., 0., 0., 25, 25); // automatic axis range calculation
SetName("NoName");
SetTitle("NoTitle");
SetFloat();
Expand Down
6 changes: 5 additions & 1 deletion hist/hist/test/test_TH1.cxx
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Expand Up @@ -318,5 +318,9 @@ TEST(TH1, SetBufferedSumw2)
// https://github.com/root-project/root/issues/20185
TEST(TAxis, EqualBinEdges)
{
ROOT_EXPECT_ERROR(TAxis _({1, 1}), "TAxis::Set", "bins must be in increasing order");
ROOT_EXPECT_ERROR(TAxis _({1, 1}), "TAxis::Set", "bin edges must be in increasing order");
ROOT_EXPECT_ERROR(TAxis _(1, -std::numeric_limits<double>::infinity(), 0), "TAxis::Set", "fixed binwidth not compatible with infinite lower/upper edges");
ROOT_EXPECT_ERROR(TAxis _(1, 0., std::numeric_limits<double>::infinity()), "TAxis::Set", "fixed binwidth not compatible with infinite lower/upper edges");
ROOT_EXPECT_ERROR(TAxis _(1, std::numeric_limits<double>::quiet_NaN(), 0), "TAxis::Set", "lower/upper edges should not be NaN");
ROOT_EXPECT_ERROR(TAxis _(1, 0, std::numeric_limits<double>::quiet_NaN()), "TAxis::Set", "lower/upper edges should not be NaN");
}
16 changes: 8 additions & 8 deletions test/stressHistogram.cxx
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Expand Up @@ -6269,26 +6269,26 @@ bool testMerge1DWithBuffer(bool allNoLimits)
// where different axis are used, BUT the largest bin width must be
// a multiple of the smallest bin width

double x1 = 1; double x2 = 0;
double x1 = 1; double x2 = 0; // i.e. automatic axis range calculation
if (!allNoLimits) {
// case when one of the histogram has limits (mix mode)
x1 = minRange; x2 = maxRange;
}

TH1D* h0 = new TH1D("h0", "h0-Title", numberOfBins, 1, 0);
TH1D* h1 = new TH1D("h1", "h1-Title", numberOfBins, x1, x2);
TH1D* h2 = new TH1D("h2", "h2-Title", 1,1,0);
TH1D* h3 = new TH1D("h3", "h3-Title", 1,1,0);
TH1D* h4 = new TH1D("h4", "h4-Title", numberOfBins, x1,x2);
TH1D* h2 = new TH1D("h2", "h2-Title", 1, 1, 0);
TH1D* h3 = new TH1D("h3", "h3-Title", 1, 1, 0);
TH1D* h4 = new TH1D("h4", "h4-Title", numberOfBins, x1, x2);

h0->Sumw2(); h1->Sumw2();h2->Sumw2();h4->Sumw2();
// The below histograms will be merged into h0, so they all need to fit into the buffer.
// Otherwise, the axis ranges will be computed already during the partial merge.
h0->SetBuffer(nEvents * 10);
h1->SetBuffer(nEvents*10);
h2->SetBuffer(nEvents*10);
h3->SetBuffer(nEvents*10);
h4->SetBuffer(nEvents*10);
h1->SetBuffer(nEvents * 10);
h2->SetBuffer(nEvents * 10);
h3->SetBuffer(nEvents * 10);
h4->SetBuffer(nEvents * 10);


for ( Int_t e = 0; e < nEvents; ++e ) {
Expand Down
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