<![CDATA[Calculate points on sphere?]]>
https://help.geogebra.org/topic/points-on-sphere
Mon, 01 Feb 2021 09:13:44 +0000Sun, 31 Jan 2021 04:36:04 +0000Zend_Feed<![CDATA[Polar coordinates of point Q can be obtained using abs(Q) and arg(Q) (and also alt(Q) for 3D points).]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297094
Sun, 31 Jan 2021 11:13:05 +0000<![CDATA[I don't understand? They are plotted cartesian 2D points not polar or 3D points.]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297152
Sun, 31 Jan 2021 20:34:04 +0000<![CDATA[I mean the actual plotted points, not the figure being represented.]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297154
Sun, 31 Jan 2021 21:17:09 +0000<![CDATA[I have attached a better example maybe. For example if: cos(theta) sin(75°) Num31 + cos(75°) Num32 + sin(theta) sin(75°) Num33 = 0 How do I determine theta? (Two possible answers.)]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297156
Sun, 31 Jan 2021 21:51:53 +0000<![CDATA[]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297160
Sun, 31 Jan 2021 22:08:09 +0000<![CDATA[I don't know how to type that into GeoGebra. When I type it I get: cos(t h ℯ t a) sin(75°) Num31 + cos(75°) Num32 + sin(t h ℯ t a) sin(75°) Num33 = 0Where h and a are checkboxes that evaluate to true. (Are you looking at my second example/attachment?)]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297162
Mon, 01 Feb 2021 00:47:46 +0000<![CDATA[Never mind. The CAS interface works differently. But the solutions I am getting don't make sense. Do I need to convert the solution to degrees or is it automatic?]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297164
Mon, 01 Feb 2021 02:18:18 +0000<![CDATA[The result by default is in radians, so I had to take that into account later on. The problem now is that the CAS command creates a list, but if I try to access an item in that list I get an "Illegal Argument" error. (See attachment.) The list itself does render the result as points if made visible.]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297168
Mon, 01 Feb 2021 03:29:35 +0000<![CDATA[I am looking for an alternative that does not live inside CAS view. I plotted the function s = cos(x) sin(75°) Num31 + cos(75°) Num32 + sin(x) sin(75°) Num33 Then I created the intersection points of this function and the x axis. Unfortunately, these points shift right or left along the function over time as I rotate the sphere using the sliders. Sometimes they are a large distance away. Sometimes they occupy the same location. I need them to stay somewhat in the same place relative to the function and to each other. Can I set min and max extents of the function?]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297178
Mon, 01 Feb 2021 06:26:42 +0000<![CDATA[Please post the .ggb file]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297184
Mon, 01 Feb 2021 07:11:26 +0000<![CDATA[I have attached the file. See points A and B when you move slider yaw_1.]]>
https://help.geogebra.org/topic/points-on-sphere#comment-297214
Mon, 01 Feb 2021 09:16:19 +0000