Geogebra 4 2
The GeoGebra basic interface is divided into three sections: Input bar, Algebra View, and Graphic View. Construction tools: Menu: INPUT BAR: Create new objects, equations and functions E.g. Construct the graph of U L3 T 64 T E6 Type: 'y = 3x^2+4x+6' or 'y = 3.x^2+4.x+6'. Hi, the file, opened by the 4.2.0 applet start, starts half loaded. See the properties of the variable: t. If I do a right click over t - within algebra window I see that t is not animated: wrong, even if the speed=0.
Tutorial:New features of Version 4.2
GeoGebra 4.2 will be released soon. 21 developers have contributed to this release, so there are many new and exciting features to explore and enjoy! Here are some of the things you can look forward to, and details of how to try out the Release Candidate are here.
Speed & Stability
As well as the usual bug-fixing and adding features, while developing version 4.2 we have rewritten large parts of GeoGebra so that it will be much more stable and also faster (much faster in some cases) than previous versions.In particular, the following will be much faster:
- anything using the Sequence command
- the following commands when used on polynomials: Derivative/Integral/Tangent/Degree/Coefficients/Expand
Here is an example of a file using Derivative[ ] that is much faster in GeoGebra 4.2.
Here is a demonstration of volume of revolution running in GeoGebra 4 and here is the same file in GeoGebra 4.2. Drag the red point marked “View3D” to see how much faster it is.
CAS View
The long awaited view for symbolic calculations is here. It allows you to symbolically factor, expand, differentiate or integrate expressions that may include parameters, and it is dynamically connected to all the other views. The documentation is available at CAS View.
Here is an example showing how the CAS View interacts with the Graphics View.
Drag the points A, B, C to see the exact calculation of the coordinates change.
Features
The feature that’s taken the most programming time in this release is that worksheets can now be viewed on devices without Java (eg iPads, Android Tablets, Chromebooks). The best way to make use of this is to upload your applets to GeoGebra (File -> Share) and then the conversion will be done automatically.
At the moment only the Graphics View is supported. You can test how worksheets will look and behave on tablets by adding ?mobile=true on the end of the URL in GeoGebra, eg:
http://www.geogebra.org/student/m20510?mobile=true
Tools
The Pen Tool has been enhanced so that it now creates a PolyLine rather than drawing to a bitmap. Together with new Delete Tool (drag a “rubber” to delete) it’s now much easier & better to use.
You can now drag a parabola, but keep its vertex fixed. Just hold down Alt when dragging!
The Rigid Polygon Tool has been enhanced with a small but useful feature: simply click on a polygon to make a “rigid” copy of it (ie the copy can be rotated and translated by dragging)
Neel Shah, as part of Google Summer of Code, has programmed some shape recognition algorithms for the Freehand Shape Tool, which will recognize circles, lines, line segments, triangles and quadrilaterals. It works very well on an interactive whiteboard (IWB).
You may also check details of the hundreds of changes in the GeoGebra 4.2 Release Notes.
Power
Kai Chung Tam has programmed the PSLQ algorithm for us in Java which allows a Surd to be numerically reconstructed from a decimal. So for example SurdText[2.414213562373095] returns a nice FormulaText ie sqrt{2}+1. See here for an example.
We have made it much easier to make worksheets with slopefields and the particular integral like this.
All you need to type is:f(x,y)=x/y
SlopeField[f]
A=(1,1)
Locus[A,f]
If you need more control over the spacing, there are some options, see the SlopeField Command in the manual.
A new command has been added: LocusEquation. This will calculate the equation of a (geometrical) locus using Gröbner bases.
For example. here is the (numerical) locus of a parabola with the calculated (exact) locus overlaid.
This page gives an overview of the new features in GeoGebra 4.4 since version 4.2.
Please see our Manual document for more detailed descriptions of each new tool and command.
Download GeoGebra here: http://www.geogebra.org/download/
Portable versions: http://www.geogebra.org/portable/
- new Sign In option to stay signed-in to GeoGebra
- new CAS Engine (Giac) which is much faster and resolves many problems from GeoGebra 4.2
- the CAS View supports exact versions of some of the geometry commands, and there is now some support for parametric curves
- PSTricks and PGF/Tikz export enhanced with fixes & more objects supported
- HTML worksheet export now uploads to GeoGebra (Ctrl-Shift-M to get new automatic Java/HTML5 export to the clipboard)
- Ctrl-Shift-B to copy the 'ggbBase64 string' to the clipboard
- (a,1) draggable
- autocreation of sliders from the Input Bar (eg y = a x + b)
- variables highlighted in the Input Bar and CAS
- Text Tool: Quotes ' replaced with “ or ”.
- defaults changed: Checkboxes, Sliders and Buttons now larger
- angles over 360° are allowed now
- angle default can be set to 0° - 180°
- Can now set angle properties for lists of angles
- automatically updates to latest version (Windows)
- OSX automatic updates offered through Mac App Store
- <Enter> pressed in spreadsheet: don't go down one cell if the cell below is fixed
- Colored objects now supported in TableText[]
- More filling styles
- BarCharts: can now set the color of each bar
We will be making the interaction between GeoGebra and GeoGebra much more streamlined over the coming year. To start with we now have:
- 'Sign in' button so that you can stay signed-in to GeoGebra
- File -> Open from GeoGebra so that you can access and edit your materials and other public materials easily
- Uploaded material can now be classified as Public (all the users can find and view it), Shared (only users who have received a specific URL-link can view the material, that will not appear in search results of other users), and Private (other users cannot view the material, that will not appear also in search results)
- works offline
- Spreadsheet View and Algebra View work on GeoGebra
- Graphics 2 works, and you can rearrange views by dragging the title bar
- Navigation Bar works
- CAS View works
- Construction Protocol works
- Object Properties mostly working (will be updated)
- Enhanced Text Tool
- Intersect[ <Polynomial Parametric Curve>, <Polynomial Parametric Curve> ]
finds multiple intersections using a computer algebra method - Intersect[ <Parametric Curve 1>, <Parametric Curve 2>, <Parameter 1>, <Parameter 2> ]
finds one intersection using an iterative method starting at the given parameters - IFactor[ <Polynomial>]
Factor over the irrationals, eg IFactor[x^2+x-1] - RunClickScript[ <Object>]
- RunUpdateScript[ <Object>]
- NSolveODE [ <List of Derivatives>, <Initial x-coordinate>, <List of Initial y-coordinates>, <Final x-coordinate> ]
- RandomUniform[ <Min>, <Max>, <Number of Samples> ]
- Colored objects now supported in the TableText command and you can now control individual lines in the table
- ClosestPoint and Distance commands now use closest point (rather than vertical point) for functions. This works best for polynomials; for other functions the numerical algorithm is less stable.
- SetCoords command now works for Sliders, Buttons, Checkboxes, Input Boxes, Images. If 'Absolute Screen Position' is selected then x,y are in screen pixels.
- SelectObjects[] now cancels any drag that is in progress (useful in scripts).
- CIFactor[ <Expression> ]
- CIFactor[ <Expression>, <Variable> ]
factor over the complex irrationals, eg CIFactor[x^2+x+1] - IFactor[ <Expression> ]
- IFactor[ <Expression>, <Variable> ]
Factor over the irrationals, eg IFactor[x^2+x-1] - Polynomial[ <Function> ]
Expands the function and writes it as a polynomial in x (grouping the coefficients) - Polynomial[ <Function>, <Variable> ]
Expands the function and writes it as a polynomial in the variable (grouping the coefficients)
Geogebra 4.2 Download
- String evalCommandCAS(String)
Returns an answer as if the String had been typed into the CAS View.
Description of all GeoGebra JavaScript Methods
GeoGebra's XML file format is documented at Reference:XML.
Geogebra 4d
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