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View Function(X)

This option is used to graph up to five functions of X across the X range of your choice. The graph can be scaled, formatted, printed, or copied to the clipboard. You may also plot the derivatives or cumulative area of the functions and you may numerically evaluate a function you have entered.

Function(X) Entry

Enter up to five functions of X you wish to graph. You may enter any numeric calculation. All of the functions and constants available within TableCurve 2D can be accessed via a special Function Insert help. The Y= prefixes are automatically supplied. The Function(X) functions are limited to single line expressions. Use the Copy, Cut, and Paste buttons to paste in expressions from the clipboard, or to copy or modify the function text. If the functions are not successfully validated, the math or parser error causing the failure will be shown and the cursor will be placed at the location in the function where the error was detected.

There are four format options for displaying the Function(X) functions:

  • Fn - displays the functions in a single plot graph
  • Fn, D1 - displays the functions (Y axis) and first derivatives (Y2 axis) in a dual plot graph
  • Fn, D2 - displays the functions (Y axis) and second derivatives (Y2 axis) in a dual plot graph
  • Fn, Int - displays the functions (Y axis) and cumulative areas (Y2 axis) in a dual plot graph

Save

Use the Save button to save the view functions(x) to disk. Although these VFX files are simple ASCII files, it is recommended that they be created only from within TableCurve 2D.

Read

Use the Read button to import a VFX file.

View Function(X) Graph

Simply select one of the four format options to create the desired TableCurve 2D Graph.

Note that cumulative areas require the evaluation of an integral for every pixel drawn in the plot. With a number of functions, with mathematically complex functions, or with large high-resolution graphs, these integrations may require some time. The integrations are done from a lower limit which corresponds with the lower limit of the displayed graph. By changing the lower X of the graph, you are thus changing this lower limit of integration.

The functions will be plotted in colors which correspond with the component colors. These colors will also be used for the main titles of the TableCurve 2D Graph.

Undo

Generate/8098.gif Use the Undo item to return to the Function entry screen in order to revise the functions or X range.

Zoom

Ten levels of zoom-out are available by using the scrollbar in the graph's control panel. If this is a Fn,Int graph which displays cumulative areas, there may be an appreciable delay in updating the graph following a change in the zoom setting.

Evaluation

Generate/8834.gif The Eval item is used to perform a full-featured numeric evaluation of one of the functions. If two or more functions are present, you must choose one for this numeric evaluation.