LoadEventNexus change tofmin to be at the lowest event's tof

Framework/DataHandling/src/LoadEventNexus.cpp

@@ -1271,8 +1271,8 @@ void LoadEventNexus::loadEvents(API::Progress *const prog, const bool monitors)
   if (eventsLoaded > 0) {
     int nBins = getProperty("NumberOfBins");
     auto binEdgesVec = std::vector<double>(nBins + 1);
-    binEdgesVec[0] = shortest_tof - 1;
-    binEdgesVec[nBins] = longest_tof + 1;
+    binEdgesVec[0] = shortest_tof;        // left edge is inclusive
+    binEdgesVec[nBins] = longest_tof + 1; // right edge is exclusive
     double binStep = (binEdgesVec[nBins] - binEdgesVec[0]) / nBins;
     for (int binIndex = 1; binIndex < nBins; binIndex++) {
       binEdgesVec[binIndex] = binEdgesVec[0] + (binStep * binIndex);

Framework/DataHandling/test/LoadEventNexusTest.h

@@ -538,7 +538,7 @@ class LoadEventNexusTest : public CxxTest::TestSuite {
     TS_ASSERT_EQUALS(WS->getNumberEvents(), 112266);
     // TOF limits found. There is a pad of +-1 given around the actual TOF
     // founds.
-    TS_ASSERT_DELTA((*WS->refX(0))[0], 44162.6, 0.05);
+    TS_ASSERT_DELTA((*WS->refX(0))[0], 44163.6, 0.05);
     TS_ASSERT_DELTA((*WS->refX(0))[1], 60830.2, 0.05);
     // Valid spectrum info
     TS_ASSERT_EQUALS(WS->getSpectrum(0).getSpectrumNo(), 1);

Testing/Data/SystemTest/3132_Orthorhombic_P.integrate.nxs.md5

@@ -1 +1 @@
-9e7cd5cb0a44319e99aa8a1fd2a5b549
+4eec33256ef34ab9cbc302eb4bdf9a7e

Testing/Data/SystemTest/PowderReduceP2D_reference.p2d.md5

@@ -1 +1 @@
-8bb9ff77463d810b9a72f7d3aaf2b9a8
+9af80ceca5fe5d41c23940871f5783c1

Testing/SystemTests/tests/framework/TOPAZPeakFinding.py

@@ -14,6 +14,7 @@
 import numpy
 from mantid.simpleapi import *
 from mantid.dataobjects import PeaksWorkspace, LeanElasticPeaksWorkspace
+from mantid.geometry import UnitCell
 
 
 class TOPAZPeakFinding(systemtesting.MantidSystemTest):
@@ -22,6 +23,8 @@ def requiredMemoryMB(self):
         return 2000
 
     def runTest(self):
+        unitcell_exp = UnitCell(4.714, 6.06, 10.40)  # orthorhombic
+
         # Load then convert to Q in the lab frame
         LoadEventNexus(Filename=r"TOPAZ_3132_event.nxs", OutputWorkspace="topaz_3132")
         ConvertToDiffractionMDWorkspace(
@@ -113,12 +116,12 @@ def runTest(self):
         w = mtd["topaz_3132"]
         s = w.sample()
         ol = s.getOrientedLattice()
-        self.assertDelta(ol.a(), 4.714, 0.01, "Correct lattice a value not found.")
-        self.assertDelta(ol.b(), 6.06, 0.01, "Correct lattice b value not found.")
-        self.assertDelta(ol.c(), 10.42, 0.01, "Correct lattice c value not found.")
-        self.assertDelta(ol.alpha(), 90, 0.4, "Correct lattice angle alpha value not found.")
-        self.assertDelta(ol.beta(), 90, 0.4, "Correct lattice angle beta value not found.")
-        self.assertDelta(ol.gamma(), 90, 0.4, "Correct lattice angle gamma value not found.")
+        self.assertDelta(ol.a(), unitcell_exp.a(), 0.01, "Correct lattice a value not found.")
+        self.assertDelta(ol.b(), unitcell_exp.b(), 0.01, "Correct lattice b value not found.")
+        self.assertDelta(ol.c(), unitcell_exp.c(), 0.01, "Correct lattice c value not found.")
+        self.assertDelta(ol.alpha(), unitcell_exp.alpha(), 0.4, "Correct lattice angle alpha value not found.")
+        self.assertDelta(ol.beta(), unitcell_exp.beta(), 0.4, "Correct lattice angle beta value not found.")
+        self.assertDelta(ol.gamma(), unitcell_exp.gamma(), 0.4, "Correct lattice angle gamma value not found.")
 
         # Compare new and old UBs
         newUB = numpy.array(mtd["topaz_3132"].sample().getOrientedLattice().getUB())
@@ -155,12 +158,12 @@ def runTest(self):
         w = mtd["topaz_3132"]
         s = w.sample()
         ol = s.getOrientedLattice()
-        self.assertDelta(ol.a(), 4.714, 0.01, "Correct lattice a value not found.")
-        self.assertDelta(ol.b(), 6.06, 0.01, "Correct lattice b value not found.")
-        self.assertDelta(ol.c(), 10.42, 0.01, "Correct lattice c value not found.")
-        self.assertDelta(ol.alpha(), 90, 0.4, "Correct lattice angle alpha value not found.")
-        self.assertDelta(ol.beta(), 90, 0.4, "Correct lattice angle beta value not found.")
-        self.assertDelta(ol.gamma(), 90, 0.4, "Correct lattice angle gamma value not found.")
+        self.assertDelta(ol.a(), unitcell_exp.a(), 0.01, "Correct lattice a value not found.")
+        self.assertDelta(ol.b(), unitcell_exp.b(), 0.01, "Correct lattice b value not found.")
+        self.assertDelta(ol.c(), unitcell_exp.c(), 0.01, "Correct lattice c value not found.")
+        self.assertDelta(ol.alpha(), unitcell_exp.alpha(), 0.4, "Correct lattice angle alpha value not found.")
+        self.assertDelta(ol.beta(), unitcell_exp.beta(), 0.4, "Correct lattice angle beta value not found.")
+        self.assertDelta(ol.gamma(), unitcell_exp.gamma(), 0.4, "Correct lattice angle gamma value not found.")
 
         # Compare new and old UBs
         newUB = numpy.array(mtd["topaz_3132"].sample().getOrientedLattice().getUB())

Testing/SystemTests/tests/framework/reference/ReflectometryApplyFloodWorkspace.nxs.md5

@@ -1 +1 @@
-00c4d103c9ef25d6b91490546b44e4f1
+b0387c5656e8396cb473835d38aa59c1

docs/source/release/v6.11.0/Framework/Algorithms/Bugfixes/37815.rst

@@ -0,0 +1 @@
+- Modify :ref:`LoadEventNexus <algm-LoadEventNexus>` so the minimum histogram bin edge is equal to the lowest time-of-flight event rather than one less. The effect is that there is no longer negative bin edges unless there is actually a negative time-of-flight in the data.