Single-valued signals

A single valued signal may be represented as text or as a line.  In the following example, I have read in signal PPF/40000/BOLO/TOPO and then created a single-valued processed signal MAXTOPO corresponding to its maximum, using the IDL command MAX(TOPO).   See here for details of how to use IDL to create processed signals.

By default, JETDSP represents MAXTOPO as text in a new plot, so plotting these two signals gives the following:

Text representation

When MAXTOPO is selected and the style editor invoked by clicking the 'Style...' button, the Style Editor dialog box appears:

After making the following changes:

• Plot Number to 1
• Preceding text to 'Maximum: '
• Following text to ' Watts'
• X-axis location to 40.0
• Y-axis location to 10000000

when the Style Editor is closed (click Exit) the picture now looks like this:

Note that the X and Y location (which set the beginning of the marker text) are in data coordinates and should remain in position relative to the plot after zooming (although the text size is fixed).

Changing the Layout to 1 row x 1 column would allow the plot to occupy the whole screen.

Marker representation

Invoking the Style Editor (above) and then choosing 'Display scalar value as: Marker' instead of text reveals the following options in the right hand side:

Selecting the option to display the signal as a marker on the Y (vertical) axis gives the following representation of the same data: