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SortEvents v1

../_images/SortEvents-v1_dlg.png

SortEvents dialog.

Summary

Sort the events in an EventWorkspace, for faster rebinning.

See Also

LoadEventNexus

Properties

Name

Direction

Type

Default

Description

InputWorkspace

InOut

EventWorkspace

Mandatory

EventWorkspace to be sorted.

SortBy

Input

string

X Value

How to sort the events: X Value: the x-position of the event in each pixel (typically Time of Flight). Pulse Time: the wall-clock time of the pulse that produced the event. Allowed values: [‘X Value’, ‘Pulse Time’, ‘Pulse Time + TOF’]

Description

In an EventWorkspace, event binning is performed on the fly. The algorithm for binning requires a list of events sorted by time of flight, so it will perform a sort (once) on each pixel - however, this is done on request and without using multiple CPUs). To speed up the calculation, the Sort algorithm pre-sorts by Time of Flight, using multiple CPUs. Using this algorithm is completely optional.

Usage

Example - Sort events by X value:

LoadNexusProcessed(Filename=r'testeventsort.nxs',OutputWorkspace='TestEventWS',LoadHistory='0')
SortEvents(InputWorkspace='TestEventWS', SortBy="X Value")

ws = mtd["TestEventWS"]
ev1 = ws.getSpectrum(1)
ptimes = ev1.getPulseTimes()
tofs = ev1.getTofs()
for eindex in range(10):
  print("Spectrum 1: Event %d, Pulse Time = %s, TOF = %d" % (eindex, str(ptimes[eindex]), tofs[eindex]))

Output:

Spectrum 1: Event 0, Pulse Time = 1990-01-01T00:00:01.547472179 , TOF = 28522466
Spectrum 1: Event 1, Pulse Time = 1990-01-01T00:00:01.943767507 , TOF = 31878622
Spectrum 1: Event 2, Pulse Time = 1990-01-01T00:00:01.074349417 , TOF = 68579583
Spectrum 1: Event 3, Pulse Time = 1990-01-01T00:00:02.147299004 , TOF = 137022165
Spectrum 1: Event 4, Pulse Time = 1990-01-01T00:00:00.459551021 , TOF = 155513220
Spectrum 1: Event 5, Pulse Time = 1990-01-01T00:00:01.404601841 , TOF = 189530310
Spectrum 1: Event 6, Pulse Time = 1990-01-01T00:00:00.137946636 , TOF = 224973368
Spectrum 1: Event 7, Pulse Time = 1990-01-01T00:00:02.029599992 , TOF = 271677101
Spectrum 1: Event 8, Pulse Time = 1990-01-01T00:00:00.972665472 , TOF = 302753430
Spectrum 1: Event 9, Pulse Time = 1990-01-01T00:00:01.831699602 , TOF = 319443029

Example - Sort events by Pulse time and TOF:

LoadNexusProcessed(Filename=r'testeventsort.nxs',OutputWorkspace='TestEventWS',LoadHistory='0')
SortEvents(InputWorkspace='TestEventWS',SortBy='Pulse Time + TOF')

ws = mtd["TestEventWS"]
ev1 = ws.getSpectrum(1)
ptimes = ev1.getPulseTimes()
tofs = ev1.getTofs()
for eindex in range(10):
  print("Spectrum 1: Event %d, Pulse Time = %s, TOF = %d" % (eindex, str(ptimes[eindex]), tofs[eindex]))

Output:

Spectrum 1: Event 0, Pulse Time = 1990-01-01T00:00:00.006085261 , TOF = 1384183147
Spectrum 1: Event 1, Pulse Time = 1990-01-01T00:00:00.015057807 , TOF = 366664899
Spectrum 1: Event 2, Pulse Time = 1990-01-01T00:00:00.060799751 , TOF = 1569052921
Spectrum 1: Event 3, Pulse Time = 1990-01-01T00:00:00.096752392 , TOF = 1501703890
Spectrum 1: Event 4, Pulse Time = 1990-01-01T00:00:00.097102049 , TOF = 2056073477
Spectrum 1: Event 5, Pulse Time = 1990-01-01T00:00:00.098120140 , TOF = 1780138738
Spectrum 1: Event 6, Pulse Time = 1990-01-01T00:00:00.137946636 , TOF = 224973368
Spectrum 1: Event 7, Pulse Time = 1990-01-01T00:00:00.145045684 , TOF = 1887014465
Spectrum 1: Event 8, Pulse Time = 1990-01-01T00:00:00.194277849 , TOF = 1608271930
Spectrum 1: Event 9, Pulse Time = 1990-01-01T00:00:00.213847028 , TOF = 1778837570

Categories: AlgorithmIndex | Events | Utility\Sorting

Source

C++ header: SortEvents.h

C++ source: SortEvents.cpp