Min v1

../_images/Min-v1_dlg.png

Min dialog.

Table of Contents

Summary

Takes a 2D workspace as input and find the minimum in each 1D spectrum. The algorithm creates a new 1D workspace containing all minima as well as their X boundaries and error. This is used in particular for single crystal as a quick way to find strong peaks.

Properties

Name Direction Type Default Description
InputWorkspace Input MatrixWorkspace Mandatory The name of the Workspace2D to take as input
OutputWorkspace Output MatrixWorkspace Mandatory The name of the workspace in which to store the result
RangeLower Input number Optional The X value to search from (default min)
RangeUpper Input number Optional The X value to search to (default max)
StartWorkspaceIndex Input number 0 Start spectrum number (default 0)
EndWorkspaceIndex Input number Optional End spectrum number (default max)

Usage

#Create a workspace
CreateWorkspace(OutputWorkspace='w2',
    DataX='1,2,3,4,5,1,2,3,4,5',
    DataY='1,0,5,3,3,2,3,1',
    DataE='1,2,2,1,1,1,1,1',NSpec='2')

#Find minima
minim=Min(InputWorkspace='w2')
print "Minima for spectrum 0 is Y = ",minim.dataY(0)[0]," and it occurs at X between ", minim.dataX(0)[0], " and ", minim.dataX(0)[1]
print "Minima for spectrum 1 is Y = ",minim.dataY(1)[0]," and it occurs at X between ", minim.dataX(1)[0], " and ", minim.dataX(1)[1]

#Find minima with extra parameters
minim=Min(InputWorkspace='w2',RangeLower=0,RangeUpper=3,StartWorkspaceIndex =1,EndWorkspaceIndex=1)
print "The new output workspace has ",minim.getNumberHistograms()," histogram, with the minimum Y = ",minim.dataY(0)[0]," and it occurs at X between ", minim.dataX(0)[0], " and ", minim.dataX(0)[1]

Output:

Minima for spectrum 0 is Y =  0.0  and it occurs at X between  2.0  and  3.0
Minima for spectrum 1 is Y =  1.0  and it occurs at X between  4.0  and  5.0
The new output workspace has  1  histogram, with the minimum Y =  2.0  and it occurs at X between  2.0  and  3.0

Categories: Algorithms | Arithmetic

Source

C++ source: Min.cpp

C++ header: Min.h