Muon Analysis Unscripted Testing: Group 2 (Fitting)¶

Table of Contents

Introduction
Tests

Introduction ¶

These are unscripted tests for the Muon Analysis interface. The tests here in group 2 are concerned with the different types of fits possible through the Data Analysis tab. In each test, the fit should succeed without a crash - the results will be tested later, in test group 3.

The master testing guide is located at Muon Interfaces Unscripted Testing.

Tests ¶

Test 1: individual fit ¶

On the Home tab, select instrument EMU and load EMU00020918.nxs.
Go to Data Analysis tab. Expand the window if the function browser is too small (you can drag the bar underneath it to set relative sizes of the widgets).
The loaded dataset should be pre-selected: “20918” in Runs and “All Pairs” selected in the data table.
“Label” box and “Co-add/Simultaneous” radio buttons should be disabled
Click and drag blue lines on graph, check start/end times are updated.
Check the reverse - change start/end times and blue lines should be updated on graph.
Set up the interface to look like this. Note the non-default values for f0.Omega and f0.Tau:

Fit the data. Graph should be updated.

Test 2: sequential fit ¶

With everything set up as in the picture above, click Fit/Sequential fit. (Runs should still be set to “20918”, a single run).
Dialog should appear. In the runs box of the new dialog that appears, type “20918-20” and hit Start.
Sequential fit of runs 20918, 20919, 20920 should happen one after the other.

Test 3: co-added fit ¶

On the Home tab, load EMU 20918-20.
Go to Data Analysis tab. Stale errors should be cleared from the function browser.
In the drop-down, there should only be one workspace (EMU00020918-20; Pair; long; Asym; #1).
Fit as before. Graph should be updated.

Test 4: simultaneous fit across runs ¶

With the same runs (20918-20) selected, select the “Simultaneous” radio button option.
Drop-down list should have three workspaces in it now, for the three runs that will be fitted.
The “Label” box should be enabled. By default, this will contain the run number string (“20918-20”) - add “SimFit” to the end of the string.
Keep the same fit function, but use the “Global” checkboxes to mark A, Omega, Phi and Sigma as global.
Fit the data. Note that plot will not be updated at present. (If you want to plot results, see the MuonSimulFit_20918-20SimFit workspace group).
Use the << and >> buttons, or drop-down list, to see the fitted parameters for each run in the function browser.

Test 5: simultaneous fit across groups ¶

Type “20918” only in the “Runs” box.
The “Label” box should still read “20918-20SimFit”, change it to “20918”.
Under property for Groups/Pairs to fit change from All Pairs to All Groups.
Keep fit function and global parameters as before.
Fit data.
Now try to fit again, without changing anything. It should warn you that the label “20918” has already been used - say no to overwriting and it should automatically increment the label to “20918#2”.

Test 6: sequential fit of simultaneous fits ¶

Keep the same setup as Test 5, i.e. Runs=”20918” and “All Groups” selected.
Click Fit/Sequential fit to launch the dialog.
If offered the choice, choose not to overwrite the label.
Dialog should appear. In this new dialog (not the interface underneath):
- Runs = “20918-20”
- Label = “LabelSeq”
- Hit “Start”
This should fit the fwd and bwd groups simultaneously for each run 20918, 20919, 20920 in sequence.

Test 7: simultaneous fit across periods ¶

The data used so far is single period, so here we will use MUSR data from the unit test data.

Go back to the Home tab, set instrument to MUSR.
Load run 15189 and switch to Data Analysis tab.
(If any fit curves are still displayed, clear them with Display ‣ Clear fit curves).
Two extra rows (Selected Periods and Periods to fit ) should have appeared in the data table. multi-period data.
Note two points:
- “All Pairs” should be selected - because “long” was loaded on the Home tab.
- In the label box, the previous label “20918#2” has not been updated. This is because it contains a non-numeric character, so is assumed to be a user-set label (this is the intended behaviour).
Set label to “MUSRlabel”
Set fit function to LinearBackground (clear any existing function).
Fit - periods will be fitted simultaneously.

Test 8: TF Asymmetry fit ¶

Go back to the Home tab and load run 62260.
In the Data Analysis tab, set the “Groups/Pairs to fit” to “Custom”.
A pop-up should appear and make sure that only “fwd” is ticked.
Close the pop-up.
Clear the fitting functions.
Add a “GausOsc” function.
Set “Frequency” to 1.3.
Enable “TF Asymmetry Mode”.
Run a fit.
Look at the fitting parameters and notice that the “Flat Background” is non-zero (larger than the error).
Disable “TF Asymmetry Mode”.
Remove the fitting functions.
Add a “GausOsc” function and set “Frequency” to 1.3.
Then add a “Flat Background” to the fitting functions.
Run a normal Fit.
The “Flat Background” should now have a value less than one.

Test 9: Multiple TF Asymmetry fits ¶

Go back to the Home tab and load run 62261.
Go to the Data Analysis tab.
Clear the fitting functions.
In “Groups Pairs to fit” select “All Groups”.
Add a “GausOsc” function with “Frequency” set to 1.3.
Enable TF Asymmetry mode.
Tick the “Global” box for “Frequency” and “Sigma”.
Fit.
Check that all values for the flat background are different to each other.