Difference between revisions of "Locus Tool"
From GeoGebra Manual
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: Select a point ''B'' that depends on another point ''A'' and whose locus should be drawn. Then, click on point ''A'' to create the locus of point ''B'' (see also [[Locus Command|Locus]] command). | : Select a point ''B'' that depends on another point ''A'' and whose locus should be drawn. Then, click on point ''A'' to create the locus of point ''B'' (see also [[Locus Command|Locus]] command). | ||
: {{Note| Point ''A'' has to be a point on an object (e. g. line, segment/interval, circle).}} | : {{Note| Point ''A'' has to be a point on an object (e. g. line, segment/interval, circle).}} | ||
: {{Example| 1=<br /> | : {{Example| 1=<br /> | ||
::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ||
| − | ::* Place a new point ''A'' on the ''x''-axis (see [[Image:Tool New Point.gif]][[ | + | ::* Place a new point ''A'' on the ''x''-axis (see [[Image:Tool New Point.gif]][[Point Tool|Point]] tool; see [[Point Command|Point]] command). |
::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ||
::* Select tool [[Image:Tool_Locus.gif]] and successively click on point ''B'' and point ''A''. | ::* Select tool [[Image:Tool_Locus.gif]] and successively click on point ''B'' and point ''A''. | ||
Revision as of 00:52, 27 November 2013
- Select a point B that depends on another point A and whose locus should be drawn. Then, click on point A to create the locus of point B (see also Locus command).
- Note: Point A has to be a point on an object (e. g. line, segment/interval, circle).
- Example:
- Type
f(x) = x^2 – 2 x – 1into the Input Bar and press the Enter-key. - Place a new point A on the x-axis (see
Point tool; see Point command). - Create point
B = (x(A), f'(x(A)))that depends on point A. - Select tool
and successively click on point B and point A. - Drag point A along the x-axis to see point B moving along its locus line.
- Type
 Warning: | Locus is undefined, if the dependent point depends on Point Command with two parameters or PathParameter Command. |
