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Contour Plot


To view or modify output options associated with your contour plot, click on the Output button of the rotating plot variables dialog. This displays the options dialog in Figure 36.4.

ctrfig4.gif (3424 bytes)

Figure 36.4: Contour Plot Output Options Dialog

Variable:Names labels the axes with variable names.
Variable:Labels labels the axes with variable labels.
Variable:Both labels the axes with both names and labels.
Orientation: Y Axis Vertical draws the axis for the Y variable vertically. If this option is turned off, the Y axis is horizontal.
Orientation: Vertical Axis at Left places the vertical axis at the left side of the plot. If this option is turned off, the vertical axis appears at the right side of the plot.
Orientation: Horizontal Axis at Bottom places the horizontal axis at the bottom of the plot. If this option is turned off, the horizontal axis appears at the top of the plot.

You can modify other aspects of a contour plot by using the pop-up menu.

Figure 36.5: Contour Plot Pop-up Menu

specifies tick labels on either axis.

toggles the display of axes.

toggles the display of observations. When this menu is toggled off, observations are displayed only if selected.

Reference Lines
toggles the display of lines that indicate the position of major ticks on the axes. This option is not available unless the axes are visible.

Contour Lines
toggles the display of contours (level curves).

toggles the display of contour level labels.

Fill Areas
toggles the display of filled contour areas. When this menu item is toggled on, an area between two adjacent contour levels is filled in with the color of the lower level.

Color Blending
applies color blending to all contour levels. The color blend in the tools window is used.

Marker Sizes
sets the size of markers used to display observations.

You can select and brush observations in the contour plot even when they are not visible. If you click on a curve at the location of an observation, you select that observation. If you click on a contour curve between two observations, you select the curve.

You can use the hand tool to add contour curves at new locations. To add a new level curve, click at some (x, y) position; the level curve that passes through that location is computed and displayed. To move a contour level, drag on the level curve, then release the mouse at a new location (x', y'). Mathematically, this process results in seeing the level set that passes through (x',y').

Finally, you can set colors, patterns, and widths of contour lines the same way you set these attributes for curves. See Chapter 13, "Fitting Curves," for examples of setting patterns, widths, and colors. See also Chapter 11, "Coloring Observations," for instructions on color blending.

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