The Define Curves panel enables you to edit existing curves and create new ones.  To edit a curve, it must first be selected either from the curve list or picked from the window.

The phase, magnitude, and frequency vectors are displayed at the top of the Define Curves panel.  The data sources for the vectors are displayed in the text fields.  Click the Phase, Magnitude, or Frequency vector radio button or in the corresponding text box to select that vector for editing.

Frequency, Phase and Magnitude vectors, Phase/Magnitude format, on the Define Curves panel

Frequency, Real, and Imaginary vectors, Real/Imaginary format, on the Define Curves panel

New data can be selected from a source file, mathematically defined using the program's curve calculator, or entered as values.  The Define Curves panel changes depending on which source is selected.

Expressions can reference any curve or vector in the current session.  Curve vector references can be defined by picking the curve with the mouse or by using the following syntax:

pmwnco.vector

where:

m is the number of the page on which the curve resides

n is the number of the window which contains the curve

o is the number of the curve in the window

vector is the YM, YP, or "f" when referencing magnitude and phase for complex and polar plot curves.

vector is the YR, YI, or "f" when referencing real and imaginary for complex and polar plot curves.

For example, p2w1c3.ym references the Y magnitude vector (.y) of the third curve (c3), in first window (w1), on the second page (p2).

When a referenced curve is edited or updated, the curves that reference that curve are updated as well.

The Curves dialog allows you to view the curves on a particular page within a session.

The curve list displays the names of all the curves in the active window.  Curves can be renamed, added, cut, copied, and pasted using the curve list controls.

Individual curves can be turned on or off.  To turn a curve off, select the curve from the list or pick the curve from the window and deactivate the check box next to the curve name above the curve list.  To turn a curve on that was turned off, activate the check box.

The Cut, Copy, Paste, Add P/M and Add R/I buttons are used to maintain the curve list for the active window.  Curves can be copied and pasted into other windows.  Curves can also be added and deleted from the list.

See the XY Plot Curve List topic for more information on manipulating the curve list.

The Curves dialog contains a tree structure that displays the current session and its pages, windows, and curves.