The term “from months to days” is a favorite slogan of mine and I have relied on it religiously for over two decades to illustrate the fundamental benefit of symbolic computation. Whether it’s the efficient development of complex physical models using MapleSim, or exploration of parametric design surface equations (my dissertation) using good old fashioned Maple V Release 2, the punch that symbolic computation provided was to automate the algebraic mechanics...

Has the 'tabbing nuisance', as reported in I declare defeat: rolling back to Maple 9.5, been resolved in Maple 12+? And what about the 'XML-contamination', as also mentioned?

PS: Congratulations to MaplePrimes for a visually very appealing interface. With the migration to this new interface, I have finally been able to gain again access to my account, this partly explaining...

A long while ago, I wrote a couple posts (part1 and part2) about mining data from the US SSA website.  I subsequently adapted the code from those blog posts into a visual application with sliders and interactive plots.  If you have played with the new ?MapleCloud functionality in Maple 14, you may have seen it posted already.

From the outset, the goal of MaplePrimes was to provide the Maple & MapleSim user communities with a platform to ask questions, share knowledge and to collaborate with other users.  And for the most part, the site has exceeded these goals.  Since its inception in 2005, we have received tens of thousands of posts from over 10,000 members, and we are privileged to have accumulated a group of dedicated, knowledgeable users who have become the heart of this community.

Go Habs Go!

Since my blog (as well as other) posts are deleted here, I am not that anxious to continue posting here. Meanwhile, I started a blog at Windows Live and my mapleadvisor site.

I was also thinking about restoring my part of the wiki that was there, but don't have time for that at the moment.

Alec

I haven't been logged into this site regularly for a while, being busy with other things.

But I've just noticed that, some time in the past few weeks, Robert Israel's eponymous handle has attained a mapleprimes points number that exceeds the total of all the handles that I've ever used here. So... congratulations, Robert!

I've...

As of today, Maplesoft has an office in Germany, allowing us to provide local sales and support to customers in Germany and Austria.  With the opening of this office, Scientific Computers will no longer act as Maplesoft's reseller in these territories.

Additional details are contained in the press release.

On and off over the last few months I've been meaning to learn about computing a center manifold approximation and normal form of a dynamic system of three differential equations.

My main reading: Stephen Wiggins, Introduction to Applied Nonlinear Dynamical Systems and Chaos, Second Edition, Springer, 2003.

I want to apply the technique to a system I derived from an optimal control problem. As a first step, I decided to reproduce the steps for the following system, for which the solution has been published.

Below is the latest version of the code to draw iso-chrone lines and a salvo of arrows onto the phase diagram of a two-dimensional system of ordinary differential equations.

I have greatly benefited from inputs by Robert Israel (who wrote the first incarnation of the procedure), Joe Riel, and pagan. A big thankyou!

The procedure is sufficiently developed for my current purpose, so I don't plan to modify it much in the near future.

Tested on Maple 13/ Classic. The last plot combines the isochrones and the salvo.

what I learned today is that you cannot write 1e-i, where i is an unassigned variable (at least not like that):

I'm posting it here to keep a record for myself.

my second blog post, aka "the lost blog post", is here.

Still some way to go. The following still needs to be tweaked case by case. And it can be made more compact too. Are the arrows flying so much faster in the top triangular area or are the arrows not printing where I expected them to ...

funny that, how do I go from first blog post to third blog post!?!?!

that's because my second blog post appears as a comment to my first blog post.

you've just got to learn...