I'm not sure why maple opted not to include the color option in the colormap when browsing an array?

The only available options are Grayscale, Hue, Hot and Cool.  Does anyone know why color was not included as an option?

 

 

Consider the following situation.  A thread acquires a mutex, then enters a critical section.  However when executing in the critical section, the thread access a memory location.  If that memory location is not in cache, the thread will wait for a few hundred cycles.  If accessing the memory location causes a page fault (the memory was swapped out to disk), the thread may need to wait a few million cycles.  However while this thread is waiting, it is still holding the mutex.  This means that other threads will not be able to enter the critical section, and may

A MaplePrimes member recently asked me how to sort two sets, using the permutation of one to sort the other.  For example, given the list

L1 := [3+I, I, 2, -1, 5, 4]:

sort it according to its magnitude and then permute the second list

L2 := [a, b, c, d, e, f]:

in the same manner.

hmm, unless I've missed something.  In any of the forums here, the first welcome post, sticky, just says hi welcome.  No explanation as to how to use the forum.  Unless one knows to navigate to books -> mapleprimes help there is no link in the first sticky post to go there and no rhym or reason why someone would go under books to find the mapleprimes help page.  I believe it should be a link available in the first sticky post of any forum.  Just my two cents.

I'm having a ton of trouble trying to insert a picture into a post.  I got it to work the other night however it's not a simple 1 step procedure.  First I upload the jpg file using the file manager which inserts a red x on the body of text then I have to click on the red x and click the insert edit image button for the picture to actually appear in the post before I post the message. 

The following interaction with Maple's Excel link came to my attention today.  I thought it had many interesting points that lead to insights about Excel and Maple that are worth sharing.

So it appears that using subscripts in Maple is not a good idea. I ran into this problem for the first time yesterday, and is documented here: http://www.mapleprimes.com/forum/drivenharmonicoscillatoramplitudephaseangle#comment-32780 And now it seems I've run into it again. Or possibly I have made a mistake ;) This is part of an implementation of Newton-Cotes method of numerical integration: restart: NCcoef := proc(N::integer) # procedure returns the Newton-Cotes coefficients for an # appoximation with N+1 points local a,c,p,h,B,LH,RH,eq,seqeq,seqco: h := B/N:

Ten years ago, I wrote an article for Dr. Dobb’s Journal on Analytical Computing. Many of the techniques I discussed there, like hybrid symbolic-numeric computing and automated code generation have since revealed themselves as indispensable tools for engineering. Others, like exact computing, have yet to reveal their potential.

 A lot has happened since that article, of course, and it’s about time I share some thoughts about what the current challenges are. There are three areas that are top of my mind and that I would like to discuss here: Parallel computing, collaborative software and user interface abstractions.

The Search facility for Mapleprimes is broken. Recent posts containing the relevant keywords are not being returned in search results.

For example, searching for either Azul or Rossler does not return a match with either relevant, matching post currently on mapleprimes' front page.

It appears as if the searchable terms database is not being updated with recent results (since the last mapleprimes system overhaul. some months ago?!).

The Maplesoft corporate blog has seen the addition of many interesting new posts recently, and I thought I'd share a few of the most recent ones with MaplePrimes.

Visualizing a Parallel Field in a Curved Manifold
Posted by Robert Lopez, Maple Fellow

Speaking of Languages...
Posted by Tom Lee, Chief Evangelist

An analytical model of mornings in the Wright household
Posted by Derek Wright, Application Engineer

I’ve always been a big fan of languages and even a bigger fan of those who readily master multiple languages with relative ease. My late brother was a linguist with a minimum of five or so distinct languages in his portfolio. Yes, there were many things that I thought I could do better, but that one gift of his was the thing that I would remember him by as time went on.  The other day, my son Eric asked me for advice on what courses to take in Grade 10. He essentially had three electives and, as with most public schools in our country, there were countless choices, all of which sounded tantalizingly interesting and enriching. In the end he came to the conclusion (OK, I drove him to the conclusion), that French, German, and Computer Science would be the right choices.

I’m not a morning person. Well, that’s not entirely true: I am not particularly a morning person, but relative to my wife, Amy, I seem awfully crusty and curmudgeonly for about an hour after waking up. She, on the other hand, is definitely of the “up and at ‘em” variety. As such, I would like to credit coffee with contributing significantly to our happy marriage these last five years.

With so many data points I can now reliably say that it is in everyone’s best interest for me to wake up first, or for us to wake up at the same time. If Amy gets up first, by the time I wake up she is reciting lists of “things I’d like to do today” as I groggily attempt to get that first double espresso to my lips. This is where something interesting happens: If I don’t perk up, Amy gets extra happy in an attempt to cheer me up (just give me time to wake up!). This implicitly suggests that she is using her mood as a forcing function to my mood. If I still don’t perk up, then things turn ugly as I am clearly being insensitive to her generous efforts to cheer me up, and her mood drops. Conversely, if I do perk up, whether from the coffee or her cheerfulness, all is well.

i have two quotes :

#1:

You confuse science with engineering, publication with patents. Intellectual property law does not recognize ownership of scientific truth. Your theory is true, or it isn't. You don't 'own' it. An apple does not need Isaac Newton's permission to fall to the ground. The primary protections for inventions are trade secret and patents. The primary protection for other intellectual property is copyright, and wise choices in how you use it and publish it.

 

This is a collection of Maple product brochures.  There are some missing, please feel free to add the missing ones to this somewhat historical collection.  I've attached a small visual of the brochures and a link to download the pdf if you wish.  Again please feel free to help me complete this collection.

The ones I am missing are all brochures before Maple 6, Maple 7, Maple 8, and Maple 9.  I will add the most recent ones after Maple 10 later, but I've started this to get things rolling.  I would hope this blog will at some time in the future contain a complete collection, however, with the internet changing, advancing everyday and the need to purge old files, it could be very difficult to source older information... good luck and enjoy. 

Maple 6 - product brochure

Download 8990_Maple 6 anchor.pdf
View file details

Maple 9.5 

Download 8990_Maple 9.5 Whats new.pdf
View file details

Maple 10 

Download 8990_maple10_datasheet1.zip
View file details

 

It has been a while since my last post.  I'm sorry about that, but I have been busy trying to the fix bugs reported as part of the Maple Beta program.  I'm also running low of good parallel programming topics.  So, as always, if you have topics you'd like to hear about (or hear more about) feel free to ask.

Today I am going to post a brief note about a blog that I find quite interesting.

Cliff Click Jr's Blog: http://blogs.azulsystems.com/cliff/