I am having problems animating the trajectory of an object in 3-D. I have no problems displaying the 3-D background and the trajectory of the objects, but I can't display the background and the animation of the object's trajectory in the same 3-D plot. The plot command that I am using is:

display(Pobj,Pline1,Pline2,...,orientation=[-45,45],view=-20..20,-15..15,0..5);

where

Pobj:= animate3d(odeplot(res1,[x(t),y(t),z(t)],0..5),-20..20,-15..15,0..5,color=black,frames=50);

View 3080_Bessel_weirdness.mw on MapleNet or Download 3080_Bessel_weirdness.mw
View file details

BesselK(0,r)*r is being turned into something that gives wrong results.

The limit as r->0 is given as -1/2 when it should at least be positive.

Please see the attached worksheet above or:

Hi again

Seems I mostly post after an upgrade! This time I've two errors. The first is this message on startup: "Error, cannot raise the datalimit above the hard limit"

Which is meaningless to me unfortunately.

The second is the fact that I've no help files that can be accessed. Starting the old-style GUI gives a hint that the help database cannot be found but the *.hdb files do exist and in the sample location in the maple 12 install as in the Maple 11 install.

Any ideas?

TIA Tim

Hello everbody.  It's been a while.  I apologize for such a long absence.  Life gets busy, and I think we all know how that can be...

We hadn't been using Maple 12 for a full hour before we found a major bug.  To see / reproduce this error:

I have been trying to discover the difference between 2D Math and 2D Input. Help details /how/ to use them but not /why/.

I enter material as 2D Math, and sometimes it gets changed to 2D Input.

Hi everyone, I'm new here.

I'm using Maple 11 on vista... everything works fine, except I can't print.  When i hit page setup, print preview, or print, the program just freezes up.  I can't seem to get it fixed.

Help please?

Hi,

If I have boolean variable x1

And assuming multiplication means "AND" for boolean expressions;

and that addition means "OR"

Then

  x1 = x1^2 = x1^3 = ...=x1^k, k >= 1

Since "x1 and x1 and x1 ... and x1" = x1;

it is true if x1 is true and false if x1 is false.

How can a boolean expression with variables taken

to various powers be simplified?

I can't take credit for this; but Dave Rusin showed

Many popular online sites, such as OEIS, for example, have online refereed journals.

When this site was in beta, this idea also was suggested for Mapleprimes.

It would be great if it was finally implemented. There are enough people here now for a good editorial board. I suggest Robert Israel as the Chief Editor.

This topic was discussed many times.

Originally I didn't think that it is a good idea, because who would write the original basic stuff? Maple is a complicated program, and even the basic stuff would cover thousands of pages. The competent people don't have time for that, and what incompetent people can write would be interesting only for them and not for anybody else.

Now I got another idea - the basic stuff can be created from the Maple help pages converted to html. But that could be done only in Maplesoft supported wiki. On this site, for instance.

> with(plots):
> with(plottools):
> plot1 := plot(1, t = (Pi-Pi/4)..(Pi+Pi/4), filled = true, color = coral):
> H := transform((t, r) -> [4*(1-r)*cos(t)+3*(r)*cos(t), 4*(1-r)*sin(t)+3*(r)*sin(t)]):
> display(H(plot1),view = [-5 .. -5, -4 .. 4]);

I have tried to find something in Help that describes the difference, but no luck. I found that many of the math items that I entered were 2D Input, yet when I toggle using F5, I get Text <> 2D Math. How did I wind up with 2D Input? Copying and pasting?

~Rich~

Filter and Ignore list are standard features of many forums and newsreaders. For example, when I want to look through the Maple newsgroup, I use a newsreader with my Ignore list and see only 3-5 posts instead of 3 or 5 thousands posts without that.

The situations on this site is not that bad, but still there are some users trying to spread their incompetence across the Universe, and I cannot use my newsreader for filtering them out. Could it be possible to implement that feature - Ignore lists in the next major release of Mapleprimes?

Good morning.

Can anyone tell me why the legends are showing up today when they were not yesterday?

...and I intermittently get Plot Builder dialogs when I edit the commands associated with these two plots...

...Maple 12 seems unstable and unpredictable...is contant rebooting of Windows necessary when using the doc mode?

Print preview doesn't respond to PageUp and PageDown keys.
It would be nice to control the size of plots w/o using the embedded components.
Plot should accept: nolegend or legend = [] (empty set). Many times I don't want a legend, and I shouldn't have to specify something like "legend = ["", "", "", ""]".
 

~Rich~

To help me learn Maple 12, I decided to translate a small project that I did into Maple.

1. Why is there an error in my text field at the beginning of the doc?

2. When I apply a new style to a paragraph, all the text changes to plain text: all formatting is removed. Is there a way to simply change the style and not the formatting, such as Italic?

3. I tried to follow the instructions in one of the training videos on how to hide math. As you can see, the assignment to d is still visible. Can simple assignments be hidden?