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Manipulating the Biplot on its window

Note: XLISP-STAT doesn't read but the left button of the mouse, so no right-button or middle-button actions are used. We use Shift-click or Ctrl-click instead. These combinations mean holding the Shift (or Control) key on your keyboard down and then click with the mouse button.

The Biplot window

Image a-bp-window

The tools on a Biplot window

At the right of the Biplot window, there are several buttons that provide menus or tools to modify the Biplot. Some quick description of these tools is provided here.

The Biplot menu button

Show original data
Opens a read-only spreadsheet window showing the data as given to XLS-Biplot. See section 5.4 on how to use these data sheet windows.
Image a-data-window
Show transformed data
Opens a read-only spreadsheet window showing the data after all the computations, that is the coordinates used to plot the final graphic. See section 5.4 on how to use these data sheet windows.
Define data processing
Using the dialog window that appear, you can choose one of the four Canned Analysis provided (see section 3.1) or to specify your own data processing method.
Biplot type
A dialog window will appear to allow specification of the type of Biplot to be constructed.
Image biplot-type
Create a clone of mine
Creates a new identical biplot in a new and totally independent window. Since there is no undo mechanism in XLS-Biplot, this is a very convenient way to trial-and-error exploration.

The Save menu button

It includes the items for several kinds of output the window can produce:

Save Biplot data
produces a text file in Biplot format (see 4.2).
Save Biplot report
produces a textual report about the data and intermediate results computed for the Biplot. You could decide whether to include in the report the data listing, the case labels, the weights or the coordinates used in the graph. Before writing the file, you may also decide to show the report in a text window from where you may then save the file (see 5.3).
Save XLS-Biplot object
After giving a file name, a copy of the Biplot window will be saved under that name. It includes data, and all the graphical specifications of the Biplot and its window, so it can be recreated by using the item Load XLS-Biplot window... in the File... menu (or the BiplotMenu menu under Unix).
Export graphics...
Raises up a dialog window to save the graphic in several formats. See 6 for details.

The Info tool

The Info tool gives information on the elements (points, arrows, labels, axis) of the graph. When pointing to any element some brief info appears on the message area. Clicking on the element provides more detailed information on it.

Image info-point
For example, clicking on a point raises up a text window with the values for the variables for that point and the transformed values, that is the coordinates used in the plot.

Clicking for Info in an arrow or label produces also a text window with similar information for the variable. See section 5.3 on how to use these simple text windows.

Clicking for Info on the axis produces a dialog window to specify how the axis are to be placed and drawn. The dialog is discussed in next section.

When pointing into the low or left end of the plot, an info string on the variance/variability of each dimension is shown in the message area. When pointing onto an empty part of the graph, a short info string about the main properties of the biplot is shown in the message area. Clicking into an empty part of the graph will raise up a dialog window to generate a report with more complete information about the biplot, like using the Save biplot report... item in the Save... menu (see 4.3.2).

The Edit tool

The Edit tool is for editing elements of the graph or the biplot itself. As shown in the message area, while the Edit tool is active, any click in the graph raises up a dialog to modify some aspect of the graph. A click in any point or arrow will allow editing that point or arrow, that is to specify its graphical properties and appearance.

Image edit-point
Clicking on any point raises up a dialog to specify the symbol to use to draw it, the color, and whether a label should be shown besides the point.

Image edit-arrow
Similarly, clicking on an arrow produces a dialog to specify how the arrow should be drawn. First you decide (using the ``Draw as'' whether the variable or column should be drawn or not, or whether it should be drawn as an arrow (from the origin to the arrow end) or an axis (a full length line passing throw the arrow). If you decided to draw an arrow or axis, then you may decide the style of the line and the style of the line end using the ``Line Style'' and ``Arrow pointer'' buttons. The ``Fill arrow pointer'' check mark will only be useful when converting the graph to postscript or pdf.

Image edit-label
Editing a label allows for choice of the font and font size, but note that the current version of Xlisp-Stat does not allow to display on screen different fonts and font sizes. The changes specified when editing a label will be visible only after converting the graphic to postscript or a similar format (see section 6).

To change properties for all points, edit any point and select 'Apply to all points' in the edit dialog. To change properties of some points, use first the Select tool to select them, and then Edit them by clicking on any of them and choosing 'Apply to selected points'. Similar tricks work for arrows and labels.

Image edit-axis
Clicking on the axis area (left or bottom part of the plot itself) gives access to the Edit Axis dialog. Using it you may modify the aspect and placement of the axis, the frame and the grid. It is also possible to invert the orientation of one or both the axis.

Clicking into the plot area but over no point and no arrow, will raise up the "Change biplot type" dialog as described in 5.2.1. Clicking outside the plot area will raise up the "Data processing" dialog, see also 5.2.1.

The Select tool

Use the select tool to select/unselect points, arrows or labels. After selecting this tool, any click on a point, arrow or label will Select it. Selected elements are displayed in green color and are shown as selected on any data window open from the Biplot button.

Selecting elements is also useful to edit them at once, as commented in the previous section.

To unselect any element, click again on it. To unselect all the selected elements, click in any free part of the graph (while the Select toll is in use).

If there is any data window open (as resulting from choosing the corresponding items in the Biplot... menu) selected points or arrows will also appear highlighted in the data window, and it is also possible to select them by clicking cells in the data window. (See 5.4).

The Move tool

The MOVE tool is for moving some elements of the Biplot. Labels can be freely placed by clicking and dragging it with this tool. Once a label has been moved by the user, automatic placement of this label is deactivated.

Arrow lengths can be changed the same way, clicking and dragging an the arrow end. This will change the length of all arrows without modifying the relative lengths. To modify a single arrow length (this is not recommended), shift-click on any arrow end and drag. Shift-click means holding the shift key and clicking with the mouse. (MS-Windows version: Ctrl-click instead).

The Coords tool

The COORDS tool shows coordinates of the mouse position when a click is done.

The Help tool

When you click on the 'Help' button in the toolbar, the window enters the Help Mode. This means that from now on, until another click is made on the same button, the mouse only may be used to get help on different parts of the Biplot window. For example, you may choose an item from the "Save..." button, and the help window will show some help on its use.

The Text Windows

When getting info on points or variables, or when generating a Biplot report, the results are shown in text windows. These are windows made only to display text, but some useful tasks are accessible trough its menu. The menu is pop up simply by any click on the window in the MS-Windows version, it is accessible in the upper part of the window under Unix/X11.

Items available are:

Increase/Decrease line width
Simply changes the vertical spacing between text lines in the window.
Copy window to the clip
Places into the clipboard a bitmap copy of the window, not very useful.
Dump text to Notepad or to the listener
Under MS-Windows, the text is dumped to a Notepad window, where it can be copied or edited and saved to a file. In Unix/X11, the text is dumped to the listener, where it can be copied and saved.
Save text to file
Opens a standard dialog to ask for a file name and saves the text in it.

Data Sheet Windows

When asking for original or transformed data through the "Biplot" button in the Biplot window toolbar, a data sheet window is open.

These windows are only for displaying data and selecting cases/variables. If you want to have these data saved, use "Save Biplot report" from the "Save..." button.

By clicking in the data table, you may select a whole column (click in its header), a whole row (click on its header), or both (click in any cell of the table). To deselect a column or a row, click again in its header. To deselect all selected cells, click on the upper left corner of the table.

Once a column (row) is selected, its corresponding arrow (point) in the graph is also selected. This make easy to visually connect numbers to the graphic.

Clicking and dragging the vertical segment between column headers allows you to change column widths.

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Next: Getting graphical output Up: XLS-Biplot User's Manual (Version Previous: Inputing data to XLS-Biplot
Frederic Udina