I study Computer Science at Faculty of Informatics, Masaryk University, Brno.

My GeoGebra involvement

• fixing bugs, mostly tool-related
• inequalities
• XSD, wiki

TODO

4.0 bugs

Ticket	Status	Type	Priority	Summary
#1801	assigned	defect	blocker	x(x-5)^2 interpreted as (x(x-5))^2
#2188	new	defect	blocker	problem with latex & tools (sticky slider)
#77	assigned	defect	critical	bug saving Macro XML
#106	assigned	defect	critical	applet redrawing bug
#1518	assigned	defect	critical	Applet problem loading file
#1827	assigned	defect	critical	making tangents causes point to lag
#2129	new	defect	critical	a&&b&&c gives error: "1"
#1171	assigned	defect	very high	P:=(x,y) doesn't work any more
#1465	assigned	defect	very high	Reduce returns *undefined-value*addition(addition(multiplicat... in applet
#1535	assigned	defect	very high	∈ broken
#1927	assigned	defect	very high	Point[rotated circle] moves
#553	assigned	defect	major	Inequality drawing
#1544	assigned	defect	major	Hidden angles show up
#1562	new	defect	major	Drag'n'drop of tools does not work anymore
#1660	new	defect	major	Zip undefined when running as applet
#1676	new	defect	major	for regular slider a, a=1° -> null pointer
#1730	new	defect	major	stretching semicircles unstable/wrong
#1975	new	defect	major	Conditional visibility and tools
#2069	assigned	defect	major	Sum-Command in CAS dos no accept decimalnumber
#2103	new	defect	major	sequence[translate[pic1,k*u],k,1,3] doesn't work until F9 (or save/load)
#2124	new	defect	major	SetValue[A,B] leaves B in memory
#2145	new	defect	major	problem using a Macro in another Macro
#2211	assigned	defect	major	Proper default for 2var functions
#306	new	defect	medium	Suppress label creation for {Vertex[poly]}
#1249	assigned	defect	medium	cas.reset() does not clear user variables in MPReduce
#1260	assigned	defect	medium	Solve[a x^3 + b x^2 + c x + d = 0, x] questions
#1376	new	defect	medium	slider with dependant endpoints should disappear when endpoints equal
#1378	new	defect	medium	Path Parameter for intervals wrong
#1423	assigned	defect	medium	f({1,2,3}) only works for linear functions
#1505	new	defect	medium	problem with underscores in names (tools)
#1659	new	defect	medium	Tool problem (beziers)
#1795	assigned	defect	medium	Some probs with inequations
#2187	new	defect	medium	Tools don't autocomplete when first created
#1916	new	defect	minor	entering infinity in slider -> invalid XML
#1922	new	defect	minor	Inverse filling for GeoConicPart
#2046	new	defect	minor	Improved latex for f(x)=if[x==0,0.4,if[x==1,0.6]]
#2151	new	defect	minor	y=f(1) doesn't work for Conditional functions

• transforms for conic sections

4.2 bugs

Ticket	Status	Type	Priority	Summary
#2133	new	defect	blocker	Intersection of inequalities
#2136	new	defect	blocker	CAS: simultaneous equations
#2137	new	defect	blocker	CAS: support second-order differential equations
#1264	assigned	defect	critical	A := Sequence[Sequence[RandomBetween[0, 5 ], i, 1, 5], j, 1, 5]
#1293	new	defect	critical	problem with invert polygon
#1362	assigned	defect	critical	CompleteSquare[3x^2+x] should give answer with fractions
#1738	assigned	defect	critical	Limits of q^n
#2111	new	defect	critical	Integral never returns from Reduce
#2158	new	defect	critical	CAS: Integral[x^-4,1,∞] gives (∞³ - 1) / (3∞³)
#2212	assigned	defect	critical	CAS doesn't handle x( correctly
#232	assigned	defect	very high	problem in CAS redefining f(x)
#756	assigned	defect	very high	Multiple level lists in CAS
#1120	assigned	defect	very high	f != g, f == g don't work
#1405	assigned	defect	very high	Restore Default Settings should have immediate effect
#1593	new	defect	very high	nested Zip not working properly
#2121	new	defect	very high	F1 in CAS View -> http://wiki.geogebra.org/en/CAS_View
#2198	new	defect	very high	cas: PartialFractions [x/(x^2-4)] doesn't work
#2203	new	defect	very high	CSolve[i=(1+r)^n-1,r] handles arbint wrongly
#622	assigned	defect	major	e behaves badly in the CAS
#1239	assigned	defect	major	ggb command odd when entered in cas
#1499	assigned	defect	major	problem with Polygon[RemoveUndefined[{A + 1, B + 1, C + 1}]]
#1529	new	defect	major	problem with inequality (until F9)
#1575	assigned	defect	major	problem with dynamic access
#1678	assigned	defect	major	Wrong result when function parameter is invalid
#1682	assigned	task	major	Automatically check all commands
#1736	assigned	enhancement	major	Output of Solutions
#1830	assigned	defect	major	check name clashes, renaming of twin variables
#1831	assigned	defect	major	support for construction steps in Construction.lookupCasCallLabel(String)
#1834	assigned	defect	major	Numeric asssignment, d := 3/2 should internally do d := Numeric[3/2]
#1835	assigned	defect	major	brackets stay red after Enter
#1896	new	defect	major	Referencing angles in lists not intuitive
#1897	assigned	defect	major	The button dialog in desktop contains too little space for the GeoGebra script
#1978	new	defect	major	CAS not cleared on File > New
#2002	assigned	defect	major	Nested integrals not working for ugly functions
#2053	accepted	defect	major	Elements missing in tool
#2083	new	defect	major	InterpreterJs returns input
#2126	new	defect	major	Solve[2*x^4-10*x^3+5*x^2-50-x^2+7=0] takes too long
#2154	assigned	defect	major	SolveODE[y-x^x] wrong
#2167	new	defect	major	CAS does not reduce radicals nicely
#2177	new	enhancement	major	Write solution of y''-5y'+6y=0 better
#2202	new	defect	major	Solve[i=(1+r)^n-1, r] gives {}
#971	assigned	defect	medium	CAS: language change doesn't change outputs
#1295	new	enhancement	medium	Enhancement: Invert[Segment[A,C], Circle[A,B] ] -> Infinite arc
#1382	accepted	defect	medium	Reflect[ Geometric Object, Line]
#1436	new	defect	medium	problem with Tools and Layers
#1496	assigned	defect	medium	problem with Zip[] and Name[]
#1538	new	defect	medium	Make sure text corners are replaced correctly in tools
#1566	new	defect	medium	Tool problem with piecewise functions
#1591	assigned	defect	medium	Introduce linear inequlities
#2096	new	defect	medium	Zip doesn't accept empty lists
#2147	new	defect	medium	problem with Zip / Vector
#2178	new	defect	medium	derivative betaRegularized(2, 2, x) doesn't work
#645	assigned	defect	minor	Substitute 3m-3 in (3m-3)^2 - (m+3)^2 problem with Maxima
#1557	new	enhancement	minor	Tangent Line and the Freehand Tool
#2011	accepted	enhancement	minor	Refactor Test.java
#2076	new	defect	minor	Dependent tools not editable
#2169	new	defect	minor	cas: 0^0 should give 1
#2200	new	defect	minor	Ctrl+Enter to copy CAS input into current cell

5.0 bugs

Ticket	Status	Type	Priority	Summary
#298	new	enhancement	major	Macros with semi-defined output
#1220	new	defect	medium	Refactor EV resizing
#801	assigned	enhancement	minor	Numeric factorization

Inequalities

• improve PointIn[ineq] algo