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sasview/src/sas/guiframe/media/graph_help.rst
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Plotting Data/Models
Graph Menu
Introduction
Locating the pointer and right-clicking on a data/theory plot will bring a context menu. On the menu, select a menu item.
Reset Graph
To reset the graph's axis range, right click on the plot and the context menu pops-up. Select Reset Graph and the plot will take its initial range. Also the 'home' icon in tool bar will do the same.
Hide/Show/Delete Graph
To Hide, click the Hide (bar) button in the tool bar.To Show, select the the 'Show' menu item in the 'Graph' menu in the menu bar.To Delete, click the 'x' button in the title bar.
Note: If a residuals graph (in Fitting) is hidden, it will not show up after computation.
Data Info
From the context menu, select 'Data Info' to see the data information dialog panel.
Save Plot Image
Right click on plot. Context menu will pop-up select save image [file name]. A dialog window opens and write a the name of the file to save and click on Save Image.
Save Data
From the context menu, select 'Save points as a file' for 1D, or 'Save as a file(DAT)' for 2D. Note that two formats, txt and xml, are available in 1D saving.
Drag Plot
Select the crossed arrows button on the plot panel toolbar to drag the plot. To disable dragging mode, unselect the same button on the toolbar.
Zoom In/Out
Select the rectangle button on the plot panel toolbar to zoom in a region of the plot.
To disable zoom mode, unselect the same button on the toolbar. After zoom in a region, select left arrow or right arrow button on the toolbar to set the graph the the previous size. If a mouse wheel button is available, zoom in/out by scrolling the mouse wheel (see Key_Sequences help for details).
Remove Data from Plot
Highlight the plot and the context menu appears.Select remove [file name]. The plot selected will disappear.
Change Scale
If the loaded data is a 1-D data changing scale or data representation will work as follows. Right click on the plot window. A context menu pops-up and select Change Scale . A dialog window titled select the scale of the graph will pop-up then change the x , the y and the view values as wish.
The 'view' option includes the axis scale short-cuts such as Linear, Guinier, Cross-sectional (XC) Guinier, and Porod plot scale. For a proper data set, these axis scales can be used to estimate Rg, Rod diameter, or Background of neutron scattering data respectively (via 'Linear Fit'; see below). For a 2D image, Right click on the image to pop-up the context menu. Select to switch from linear to log scale. The scale selected is printed on the status bar.
If the loaded data is an image. Right click on the image to pop-up the context menu. Select to switch from linear to log scale. The scale selected is printed on the status bar.
Linear Fit
Linear fit is to perform a line model fitting keeping the scale of the plot. Highlight data to fit. From the context menu select Linear Fit . A dialog window appears. Change model initial parameters, data limits and hit fit button. New parameters values are displayed and the line with the new parameters is added to the plot. Especially for Guinier, XC Guinier, and Porod plot scale, this 'Linear Fit' will provides Rg, Rod diameter, and background, respectively. The following figure shows an example for the Guinier scale.
Other Graph Modifications
Some custom modifications of the symbols, text, axis, etc of the graph are provided.
2D Data Averaging
Principle
This feature allows you to perform different types of averages on your data, and allows you to see what regions of the detector will contribute to the average. The region to be averaged will be drown and can be modified by dragging the lines around.
How to Average
Right click on 2D data for the context menu to appear. Select one type of averages among "sector [Q view]", "Annulus [Phi view]", "Box sum", "Box averaging in Qx ", "box averaging on Qy","Perform circular Average".
A slicer will appear except for "Perform circular Average" that you can drag by clicking on a slicer 's marker. When the marker is highlighted in red, it means that the slicer can change size.You can also move some of the slicer by simply drag its side when highlighted in red. the slicer size will be reset to its previous size if the user try to select a region greater than the size of the data.
The user can also select a region to average when a slicer has been selected already by right clicking on the context menu and selecting Edit Slicer Parameters . The dialog window will appears and the user can enter values to selected a region or selected numbers of points to plot nbins .
For Box sum , when the user selects this option, a new panel is created containing the result of average of the sum of every pixels contains on that data.The user can also enter values to select a region.
Available Averagings
Some different types of averaging are provided for.
Unmasked Circular Average
This operation will perform and average in constant q-rings around the (x,y) pixel location of the beam center.
Masked Circular Average
This operation is same as 'Masked Circular Average' except that the masked region is excluded if masked.
Sector Average [Q View]
This operation averages in constant q-arcs. The width of the sector is specified in degrees (+/- delta phi) each side of the central angle (phi).
Annular Average [Phi View]
It performs an average between two q-values centered in (0,0), and averaged over a width of a specified number of pixels. The data is returned as a function of angle (phi) in degrees. Moving one circle of this slicer to radius of zero corresponding to a circular averaging on radius qmax , the outer circle. The angle zero starts from the positive x-axis direction.
Box Sum
Perform the sum of counts in a 2D region of interest.When editing the slicer, the user can enter the length and the width the rectangle slicer and the coordinates of the center of this rectangle.
Box Averaging in Qx
Computes average I(Qx) for a region of interest. When editing the slicer, the user can control the length and the width the rectangle slicer. The averaged output is calculated from the constant bins with rectangular shape. The resultant q values are nominal values, i.e., the central values of each bins on the x-axis.
Box Averaging in Qy
Computes average I(Qy) for a region of interest.When editing the slicer, the user can control the length and the width the rectangle slicer. The averaged output is calculated from the constant bins with rectangular shape. The resultant q values are nominal values, i.e., the central values of each bins on the y-axis.
Floating Panel
For a graph panel to float on the top of the SV window:
Press the Ctrl(Cmd on MAC) key on dragging and placing a panel. Or if you want to make all plot panels float, select 'Float' from Graph/Preperences in the menu bar. Otherwise choose 'Dock'.
Zoom In/Out
To Zoom in or out the full plot, locate the mouse point inside the graph which will be the center of the zooming, then *rotate MouseWheel.
To Zoom in or out the plot in x or y direction, *locate (and click) the mouse point near x (or y) axis just outside of the graph and then *rotate MouseWheel .* Note that this works only on the 1D plots.
