| Appearance of loaded files
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. The currently 'active' segment of the file -- the active screen - is indicated by the slider position. Use the slider or 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
You can select blocks in 'entire file' or in 'active screen only' mode, and blocks can include multiple screens. If a single screen is shown, mark the start with a single click, then shift screens until the end can be marked. A selected block is indicated as a color-inverted rectangle in the plot area, and is scaled to fit within the block window (discrete data points on the block window only appear if the number of included points is small).