My father’s first car when our family moved to North America was a 1970 Buick Skylark sedan, and the color was a majestic deep green. I was seven years old at the time and this was my first experience with a green car. It’s ironic that my life in North America started with a green car and has come full circle with green cars all over the place as far as my job is concerned. But of course, today’s green car is really about highly fuel efficient cars...

http://www.tiny9.com/u/Math5543

Fun interactive paradox about the MRB constant.

Comes with free Mathematica player.

I notice that a Seach on this site for the word "cipher" fails to show this result as a hit. Why is that?

It is by no means the first time that a keyword Search on Mapleprimes has failed to return a hit for an old comment/post/answer of mine. I'd really like to know why there are so many such misses.

Though Maple provides routines to express integers or floating in different
integer bases the output looks not as nice as I want to have it.

And for example it does not work as expected using the 'simple ways' (while
for hex there is no simple way for floats):

  Digits:=16; # for all the following

  x:=frac(evalf(Pi)):
  x:= x* SFloat(1,-14);
              ...

This post gives equation of stability region of a Runge-Kutta ODE solver (Dormand-Prince45) as implicit domain equation and ODE-IVP.

Contents are:

• Runge-Kutta solver is implemented
• Solver is applied to test equation and growth factor is obtained
• Stability regions are defined by separating hyperplane (GF=growth factor=1)
• Stability regions are plotted by bruteforce approach (implicitplot)
• Boundary of stability regions...

Hello.

I was thinking about how I have used Maple for making animations. Thinking about it, I remembered an animation that I made to motivate the students of a calculus course. With this animation, I was searching to show the students the power of Maple.

I would like to see other animations for getting new and interesting ideas to show the students.

If you want to upload some animations, we could do a funny post with many animations.

Maple uses the LGPL licensed GMP as a support library for doing large integer and high precision float computations. There exists is a later version of GMP than was bundled and shipped in Maple 14.x. A natural question is whether it would improve Maple's performance. Another question is whether it can be used within Maple 14.

The upload utility does not allow extension .mpl, which is ubiquitous for Maple script files.  I could change the extension to .txt, but that is annoying (I never name Maple script files .txt).  As a workaround I can and do zip the file.

When mucking around with my Maple setup, I occasionally find it useful to check various kernelopts settings.  To simplify this task, I wrote the simple kerneloptsall procedure, which prints all the (useful) values of kernelopts:

(**) kerneloptsall();
ASSERT                    = false
assertlevel               = 0

Using the Open Maple application program interface (API), the ExternalCalling module, a C compiler, and some basic understanding of the Maple data structure format, you can create Maple utilities that run nearly as fast as Maple builtin procedures.

To show how this is done, I will start with a simple example and then proceed to a slightly more complex procedure that improves ?ListTools[SearchAll]

Read the abstract for this medical journal. It describes "Tai's Model" for determining the area underneath a curve. Apparently the article has received 75 citations.

I am unable to access the Constrained Optimization file from Maplesoft application center

http://www.maplesoft.com/applications/view.aspx?SID=6818 

Attempting to download file is not working.  What happened to it?  Can it be fixed?

I will use this post for a list of conclusions drawn from MRB constant N and the many similar approximations that I have found. 

Let x= MRB Constant.   Each approximation is followed by a maple input so you can verify these approximations. 

Like many in the technology industry, I am a big fan of science fiction films and I’ve written in the past about how exciting it is for me to have a job where science fiction and reality literally meet. Over the past few months, several key projects from various Maple and MapleSim users caught my attention for various reasons and once again, I was forced to giggle publicly as the shear cool factor of these applications overcame my normal mature demeanor.

Maple 14 - returning after not using Maple since M13...

1. Still can't figure out how to scale images and text. I tried putting an image in a table cell with some text next to it. The only way I can see is to put any images in a space by themselves and not relate them to text. What I see on the screen has little relevance to the printed product, and the only way I have found to scale images correctly is by trial and error. See #6 below for time penalty for changing a table cell size.

2. I don't get to choose the header/footer font size?

3. The footer date format is 12/1/10, which is very nearly the worst it could be, and doesn't respect my Windows settings: 2010.12.01.

4. There is no option to use the file save date rather than the current date.

5. Dragging a corner of an image changes the scaling. IMO, that's what the tabs on the sides and top/bottom are for. Dragging corners should preserve scaling.

6. Changing a cell size in a table means waiting 10 s to get full access to Maple menus and the document (dual 3.4 GHz CPU, 3 GB RAM).

7. I clicked on the Space Shuttle Sim to get an idea of what Maple can do, and then waited 10-15s while Maple played with the palettes and swapped to a new document.

I guess that Maple is about more than this, but I am [relatively] new to it, so I begin where I can...these are usability issues. I understand that Maple has been selling the doc interface for a few releases, but not made much progress.

I guess that I can kiss (no, I'm not upset, just a style of speech) off the document mode and just use the power of Maple to calculate what I need and copy the results in to a word processing program...

[a few hours later] I should say that I found some more comments on the slow interface, and took the hints to close the palettes, which sped things up quite a bit...the penalty is, of course, that I must open them to use them, and that sort of defeats the purpose. Still, if I regard them as drop menus...

There is still the issue of scaling images, and I guess from a quick glance at the included examples that Maple has not figured out how to handle images. I tried to lock the image size, but have not found a way to do so. The quick tutorial on the Maple web site was a great help in getting up to speed quickly.