<![CDATA[Intersect command should work with Curve objects]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects
Sun, 04 Dec 2016 16:38:31 +0000Thu, 02 Feb 2012 18:26:43 +0000Zend_Feed<![CDATA[I agree. This is much needed. Also tools to find local extrema etc should work with curves and loci. As it is I'm having problems doing certain types of investigations. If I measure how an angle changes when a point moves I can show this function as a trace or a locus in graphics view 2 but I cannot find the maxima of the trace or locus. As a workaround I copy traces to the spreadsheet and make a 3rd- or 4th-degree polynomial regression round the extremum and then I can find the extremum of the polynomial. But when I change the conditions of the constructions with another slider I would very much like to se the extremum of the locus move as the locus itself shifts. Currently, however, I an frequently unable to crate the locus, let alone find its extremum, and certainly not exploring this dynamically.]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101705
Wed, 22 Feb 2012 19:16:30 +0000<![CDATA[I am also having difficulties completing some investigations that I need to do, typically because I am using Geogebra 5 (for the excellent 3D feature) and I have found on several occasions that needed functionality was not working yet. As I normally only find this out once I have gone some way into setting up a problem, it is pretty frustrating. A few examples: a) Investigations into reflections from conic surfaces - stalled because 1) multiple intersections of lines with a conic are really slow down performance, 2) a rotated function or conic gets turned into a 'curve' and you can't calculate intersections with a curve, b) Investigation into reflections from an articulated plane mirror in a 3D environment - stalled because of no support in 3D for angle bisector. I fully realize that Geogebra 5 is in development and is a work in progress. For example, I was stalled by the lack of the ability to calculate the angle between two arbitrary lines in G5 for a while, but this has been added in recent versions. So, I am not complaining at all, but I do want to point out that some of us are really relying on the maybe less exciting but fundamental functionality to get our stuff done. Swulf]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101707
Sat, 25 Feb 2012 01:47:19 +0000<![CDATA[I've not tried version 5 yet, so I can't suggest any workarounds unless you're able to do what I tried with capturing a trace and fitting a polynomial. Reaosonably, it should be possible to find intersections of curves - other software packages like Cabri can do this.]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101709
Sat, 25 Feb 2012 23:51:47 +0000<![CDATA[Are there any openings on this (intersection of curves/loci/paths and other objects, extremas and roots of curves/loci/paths etc)? As stated above - it would open up for multiple step investigations like: "Ok - so I see from the locus/trace that the maximum is here, but what happens when I change this parameter...? Which path will the maximum follow?"]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101711
Thu, 21 Jun 2012 23:50:36 +0000<![CDATA[determine the intersection(s) between this curve and various Lines if the lines pass through the origin (0,0), is easy: y = mx m = tan(t) t = atan(m) aa(t) ...]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101713
Fri, 22 Jun 2012 00:42:16 +0000<![CDATA[And you can do this: list1 = Sequence[aa(t), t, 0, 6.28319, pi/100] g = PolyLine[list1] Intersect[line,g]]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101715
Fri, 22 Jun 2012 00:49:41 +0000<![CDATA[https://ggbm.at/555301]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101717
Fri, 22 Jun 2012 01:05:03 +0000<![CDATA[Yes, I agree, you and I can do that, but it is not obvious how to do this for students (or for me for that matter). Also it takes time and diverts the focus from the mathematical investigation to the technique of creating the intersection. And if we can do it like that I suggest it be implemented in some fashion so that anyone can do the intuitive thing: find the intersection with the ordinary intersection tool.]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101719
Fri, 22 Jun 2012 12:50:07 +0000<![CDATA[it's just a workaround ...]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101721
Fri, 22 Jun 2012 19:11:48 +0000<![CDATA[Absolutely, and thank you for it and excuse my tone, which was not intended. :flushed:]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101723
Fri, 22 Jun 2012 22:40:50 +0000<![CDATA[ would it be possible for it to be added in a future release? Intersect[ <Line>, <Curve> ] works from 4.1.108.0]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101725
Tue, 03 Jul 2012 13:19:26 +0000<![CDATA[And when will Extremum[ <Locus> ] work? :smiley_cat: It's a definite wish for version 5.]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101727
Fri, 31 Aug 2012 15:57:23 +0000<![CDATA[As the summer is comming near and development projects are getting planned, I thought I'd re-iterate this particular point on my wish list. Extremum[ <Locus> ] would allow for multiple-step investigations: "Aha - the maximum point is here, but how will this change if I change this parameter?" Finding the locus of the maximum of a locus... Extreme power :D]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-101729
Fri, 15 Feb 2013 09:31:22 +0000<![CDATA[You can place a point on locus and do Minimize / Maximize to find extrema of the locus.]]>
https://help.geogebra.org/topic/intersect-command-should-work-with-curve-objects#comment-208596
Sun, 04 Dec 2016 16:38:32 +0000