| Appearance of loaded files
After a file is loaded, the 'plot area' in the top part of the screen displays
either the first channel of the file (single
channel mode) or several user-selected channels (multi-channel
mode); see the VIEW menu for details.
The screen in single-channel mode looks approximately as shown below
-- but note that immediately after loading, no block will be selected and
no data will appear in the results or block windows.
The colors of the plot
area and block window are user-selectable (VIEW)
menu and may differ from this example.
The appearance of the plot area depends on the screenwidth (the width of the screen in pixels) and the number of cases. If the file contains <= screenwidth cases, data are plotted 1 pixel per case (if the number of cases is < 50% of screenwidth, the plot is expanded, with more than 1 pixel per case). If the total number of cases is more than screenwidth, the X-axis will be scaled to fit within the screen dimensions. 'Screens' (consisting of screenwidth cases) are indicated by vertical lines, with a crossbar at the top of the active screen. The example shows a file containing many screenwidths of data.
If there are more than screenwidth cases, the bottom of the plot area will show a screen selection slider, with tickmarks to indicate the number of 'screenfulls' of data in the file (for very large files, not all tickmarks are shown, for clarity). The currently 'active' segment of the file -- the active screen - is indicated by the slider position. Drag the slider with the mouse, or use the left and right arrow keys to change the active screen. To view the active screen only (necessary for some manipulation and analysis operations), hit the shift or return keys. Do this again to go back to viewing the entire file (this example shows 'entire file' mode). Any markers are shown as vertical dashed lines (this file contains numerous markers, but they are not shown; see the VIEW menu). While in the plot area, the cursor is a cross-hair; out of the area it is an arrow. The data bar has a readout of case number, elapsed time, and the value of the currently active channel at the cursor position. The time of day is shown (24-hour scale) along the bottom of the plot area, with optional hour indicators (vertical dotted lines).
To perform analyses and some transformations, you need to select a data
block. This can be done by the normal 'click-hold-and-drag'
method (the cursor must be within the plot area). A second method
uses individual clicks: move the cursor to the desired start point and
click once; repeat for the end point (which may be on either side
of the start point). Alternately, blocks of defined width can be selected
with single clicks (see the BLOCK
WIDTH option in the ANALYZE
menu). If there is sufficient space, you can 'shift' blocks to the left or right with the BLOCK
SHIFT commands (also in the ANALYZE