Time History Function Definition Form - User

Access the Time History Function Definition form to define a time history function based on user specified time and function values as follows:

Click the Define menu > Functions > Time History command to display the Define Time History Functions form. The do one of the following:

Select User Function from the Choose Function Type to Add drop-down list and click the Add New Function button.
Select a previously defined user specified function and click the Modify/Show Function button.

Use the Time History Function Definition form to define a time history function based on user specified time and function values.

Function name edit box. Specify the name of the function or use the default.
Define Function area and Time and Value edit boxes. Input pairs of Time and function Values in this area. Type the time and function value corresponding to a single point of the function into the edit boxes at the top of this area. Then click the Add button. Repeat this process until all points have been entered. Enter the points in any order; they will be sorted by ascending time. Time values must be unique (i.e., time values cannot be duplicated).
To modify an existing pair of values, highlight them in the list box. Note that they appear in the edit boxes at the top of the area. Type revised values in the edit boxes and click the Modify button.
To delete an existing pair of values, highlight them in the list box and click the Delete button.

Function graph area. This area displays a graph of the function. It updates automatically as additional points are defined for the function. If your computer has any problem with the automatic update, click the Display Graph button located just below the graph.

Run your mouse pointer over the function graph and a dot appears along the line representing the function. The coordinates of the dot are reported in the box just below the graph.