IndexPeaks dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| PeaksWorkspace | InOut | PeaksWorkspace | Mandatory | Input Peaks Workspace |
| Tolerance | Input | number | 0.15 | Indexing Tolerance (0.15) |
| NumIndexed | Output | number | Gets set with the number of indexed peaks. | |
| AverageError | Output | number | Gets set with the average HKL indexing error. | |
| RoundHKLs | Input | boolean | True | Round H, K and L values to integers |
Given a PeaksWorkspace with a UB matrix stored with the sample, this algorithm will use UB inverse to index the peaks. If there are peaks from multiple runs in the workspace, the stored UB will be used to get an initial indexing for the peaks from each individual run. Subsequently, a temporary UB will be optimzed for the peaks from each individual run, and used to index the peaks from that run. In this way, a consistent indexing of the peaks from multiple runs will be obtained, which indexes the largest number of peaks, although one UB may not produce exactly that indexing for all peaks, within the specified tolerance.
Any peak with any Miller index more than the specified tolerance away from an integer will have its (h,k,l) set to (0,0,0). The calculated Miller indices can either be rounded to the nearest integer value, or can be left as decimal fractions.
Example - a simple example of IndexPeaks
Note
To run these usage examples please first download the usage data, and add these to your path. In MantidPlot this is done using Manage User Directories.
# Load Peaks found in SXD23767.raw
Load(Filename='SXD23767.peaks',OutputWorkspace='peaks_qLab')
#Set orientated lattice
ubMatrix = [-0.06452276, 0.2478114, -0.23742194, 0.29161678, -0.00914316, -0.12523779, 0.06958942, -0.1802702, -0.14649001]
SetUB('peaks_qLab',UB=ubMatrix)
# Run Algorithm
indexed =IndexPeaks(PeaksWorkspace='peaks_qLab',Tolerance=0.12,RoundHKLs=1)
print "Number of Indexed Peaks: ", indexed[0]
Output:
Number of Indexed Peaks: 147
Categories: Algorithms | Crystal