To use the demonstration data set the appropriate checkbox and press DEFAULT DATA, followed by SUBMIT. The first ten data pairs will be displayed in the window. Move to other points in the time series by setting the value number and pressing the <> button. If desired, the default data can be edited in the data windows before the SUBMIT button is pressed.
To enter own data press OWN DATA and follow the instructions that will appear in the window. Select the entire window text and replace it with your data, either by typing the data directly into the window as time, east component, north component separated by commas and one group per line, or by pasting data in from a spreadsheet or text processor. When all data in the window are complete press SUBMIT. This produces a display of the data as they are accepted by the programme. Press RESTORE DATA to return to the data in their original form if further editing is required. RESET clears the entry field.
To plot the data displayed in the window click on the type of graph you want to generate (components, speed and direction, etc.). This changes the data display to the appropriate variables. Reset both graph windows, press TRANSFER DATA TO APPLET, followed by GRAPH. If a graph becomes too "busy" (shows too many overlapping curves) it is possible to switch off one of the two variables (east vs north component or speed vs direction). Use the check buttons at the bottom right of the graphing panel to select the variable you wish to plot, reset both graph windows and press TRANSFER DATA TO APPLET, followed by GRAPH.
To edit a graph edit the data in the number windows, press RESET in the applet and repeat the plotting procedure.
A running average over the time series can be calculated when data are displayed in the number windows. Set the averaging interval and press CALCULATE AVERAGE. To maintain alignment with the time series the averaging interval is automatically set to the nearest (higher) odd number. The smallest acceptable averaging interval is over 5 data points, the largest is over the total number of data points minus 10. To display the average together with the original time series, press RESET in both graph windows, then TRANSFER DATA TO APPLET and graph the data again. To display the data without the average set the averaging interval to zero and proceed as if you were averaging. Note: When averaging the wind stress settings (components vs. speed/direction) override the wind settings.
|The variables are colour-coded as follows:|
|upper data window: |
east component averaged east component north component averaged north component
wind speed averaged wind speed wind direction averaged wind direction
|lower data window: |
east component averaged east component east component from averaged wind north component averaged north component north component from averaged wind
stress magnitude averaged stress magnitude stress magnitude from averaged wind (see notes)
© 2000 M. Tomczak
Graphing applet © 2000 Mariusz Bajger
Last updated 3 May 2000.