GraphDraw manual

The Graph window


[ Graphs | Graph window menu ]

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Graphs

The data can be plotted in several different formats, for example:

The format of the Graph can be changed at any time, and the layout fine tuned, using the Graph window menu, described below.


The Graph window menu

The Graph window menu is shown to the right.

Layout...
This opens a dialogue that allows a range of layout options to be changed. Any changes will apply only to that specific graph (or any subsequent graphs plotted for that particular dataset), any other graphs displaying will be unchanged. The range of options available is described on a separate page.
Annotate...
This opens a dialogue that allows the graph annotation to be added and edited. The window is shown below.

An overall graph title, and titles for the x and y axis can be added. The six text effect buttons facilitate the inclusion of effects, such as italic or bold, and greek or symbol characters. These effect styles are set up in the choices font section. Text can also be moved up and down to create superscript and subscript text.

The axis text is normally placed centrally on the appropriate axis. The option Right justify legends will place the text at the right or top of the axis. The images below demonstrate these settings.

  

The four buttons at the foot of the window control the display action. Display is used to show the text on the graph. Delete will clear the writable fields and remove the text from the graph. Hide will temporarily remove the text but not delete it. Hidden text can be recovered using the Display button. Cancel will simply close the window without making any change.

Once text has been added for graph annotation, it will be saved with the data, and will be reloaded when the data is reloaded into GraphDraw.

Interpolate...
This will present you with a dialogue containing two tabs. The Single values tab is shown below. This allows you to enter an X value, and either entering RETURN or clicking Calculate will calculate the corresponding Y value using the fitted equation as plotted in the graph. Note that you are only allowed to interpolate values, you cannot extrapolate beyond the limits of the data fitted.

The Range of values tab is shown below. This allows you to enter a start value, an end value, and an increment which will be used in the calculation. No extrapolation is allowed. Clicking Save or pressing RETURN will result in a Save as dialogue. The text file, containing the results of the calculation can then be saved to disc or transferred to a suitable application. The options Verbose output and Comma separate values control how the output is formatted, and what is included. Comma separated gives the simplest output - the x and y values with a comma separator, otherwise the values are tabbed into fields padded with spaces. Verbose output includes additional information such as the equation fitted and the parameters found.

Here is an example of verbose output.

Interpolation of data from parabola fit
---------------------------------------
Equation fitted: Y = a + bx + cx^2
a = -43.6253
b = 3.91748
c = -0.0110847

     X value      Y value
     -------      -------
          20       30.29
          30      63.923
          40      95.338
          50      124.54
          60      151.52
          70      176.28
          80      198.83
Save as
This leads to a small submenu offering the options to save as a draw file or as a multiplot file. The graph can be saved as a drawfile to disc or directly to another suitable application. Alternatively, the data for the points and the line (if plotted) can be saved in MultiPlot format, either to disc or direct into MultiPlot.
Print...
This leads to a small dialogue.

This will show the currently active printer in the window title, and allows the number of copies to be selected. Clicking Print will print the Graph, using the print format setting in the print tab of choices. If there is not an active printer, the Print button will be shaded, and the window title will include 'no printer'.


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GraphDraw is © Chris Johnson, 2014
Email:chris@chris-johnson.org.uk

This document last modified on 15th August 2015