Integral

The integral function calculates the area under a segment of the graph. The integral is calculated using the trapezoid rule. For example, between adjacent points x1 and x2, the integral of f(x) is given by:

Integral = (f(x1) + f(x2))/2 * (x2-x1)

If the selected region contains more than two x values, the integral is the sum of the integrals between successive x values. Note: If more than one column is plotted, each plot will be integrated.

Adding an Integral to a Graph

  1. Select the portion of the graph that you want to integrate.
  2. Add an integral either by clicking the Integral button on the toolbar or by choosing Integral from the Analyze menu. To remove the integral from the graph, click the close box in the upper corner of the integral helper object.

To change the displayed precision and other options, double-click the Integral helper object to view the Integral Options dialog box. In this dialog box, you can also check the box next to Show on Graph to hide the helper object on the graph. Choose Additional Object Options > Reveal Hidden Objects from the Options menu to return it to the graph.

See Also: