The Dialogs
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Chapter 5. The Dialogs

Function

The dialog Function is used to create and perform the settings for function plots. It looks the same for 2d, surface, pie and 3d plots. Only a few plot specific things differ. Especially the Style is different for surface plots.

The first lineedit contains the expression for the plot function. The entered expression is evaluated via a powerful parser. For a complete list of supported functions see the parser section.

the second lineedit is for setting the label of the created graph. This is the label which you see in the legend.

In the "Range" and "Number of Points" section you can select the range and the number of points for the created function.

With the remaining style items you can influence the appearance of the function. If you create a normal function the first selection defines the line style (Lines, NoCurve, Steps, Boxes, Impulses, Y Boxes), the color and if you want to have it filled (with a different color). The other items select the symbol for the plot points, with color, size, if it should be filled and with which color. If you create a surface plot you have the possibility to select whether to show a density or contour plot, or both. Then you can select the number of levels for contour plots and the colorscale for density plots.

For changing the settings of a function you have to select the change button in the list dialog. For changing the style of a surface plot you can also use the "Plot Settings" dialog.

Since version 1.4.0 LabPlot uses the new QWT 3D Plot which should be preferred to the simple 3d plot.

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