代數區

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代數區介面

預設情況下，代數區會被配置在 繪圖區的旁邊。此外，在桌機版指令列位於 GeoGebra 視窗的下方，而在線上版和平板版則是直接將指令欄嵌在 代數區。繪圖區工具列顯示在視窗的上方，「復原」、「重複」按鈕在右上角。

GeoGebra Web and Tablet Apps

GeoGebra Desktop

The Algebra View is part of the Algebra Perspective, although you may change the layout of GeoGebra's user interface according to your needs.

Creating Mathematical Objects

Direct Input

In the Algebra View you can directly enter algebraic expressions using the integrated Input Field (GeoGebra Web and Tablet Apps) or the Input Bar at the bottom of the GeoGebra window (GeoGebra Desktop). After hitting the Enter key your algebraic input appears in the Algebra View while its graphical representation is automatically displayed in the Graphics View.

範例： The input y = 2 x + 3 gives you the linear equation in the Algebra View and the corresponding line in the Graphics View.

Commands

GeoGebra also offers a wide range of Commands that can be used to create objects in the Algebra View. Just start typing the name of a Command into the Input Bar or Input Field and GeoGebra will offer you a list of Commands that match your input.

Tools

Although the Algebra View doesn’t have it’s own Toolbar, you can create Dependent Objects with the mouse. Select a tool from the Graphics View Toolbar and click on any appropriate object in the Algebra View in order to create a new Dependent Object.

範例： Create two points A and B, whose coordinates are displayed in the Algebra View. Select the Line Tool from the Graphics View Toolbar and click on both points in the Algebra View in order to create a line through points A and B.

Modifying Mathematical Objects

You can modify the algebraic representation of mathematical objects directly in the Algebra View.

Activate the Move tool and double click a Free Object in the Algebra View. In the appearing text box you can directly modify its algebraic representation. After hitting the Enter key, both the algebraic representation in the Algebra View and the graphical representation of the object in the Graphics View will automatically adapt to your changes.

If you double click on a Dependent Object in the Algebra View, a dialog window appears allowing you to Redefine the object.

Display of Mathematical Objects

By default, mathematical objects are organized by Object Types in the Algebra View. In GeoGebra Desktop, you may use the Style Bar option Sort by in order to re-sort the objects by Dependency, Layer or Construction Order.

提示： You can collapse or expand each group of objects individually (e.g. all points, all free objects, all objects on a specific layer) by clicking on the plus or minus symbol in front of the group’s name.

Algebra View Style Bar

The Algebra View Style Bar provides buttons to

• show / hide Auxiliary Objects
• sort the list of objects by different criteria
• display additional Views in the GeoGebra window (GeoGebra Web and Tablet Apps)

Hiding Mathematical Objects in the Algebra View

If you want to hide the algebraic representation of an object in the Algebra View, you may specify the object as an Auxiliary Object. Open the tab Basic of the Properties Dialog and check Auxiliary Object.

By default, Auxiliary Objects are not shown in the Algebra View. You can change this setting by selecting Auxiliary Objects from the Context Menu (right-click or Mac OS Ctrl-click), or by clicking on the appropriate icon in the Algebra View Style Bar.