One of the greatest pleasures of my job is meeting users and learning first hand of their achievements (hopefully with our products). Last week was a particularly eventful week and a distinct highlight was a visit our friends at the Canadian Space Agency (CSA) in Montréal.

Dear all, I need some help with this program I have. I ran this recursive system only to find that it stopped working at 1.89Gb. Anyone out there knows the problem or maybe there's a better way of writing this program?

Following worse-than-good advice can lead to loss of time and to greater misunderstanding. I have noticed, over the past year, a growing proportion of suboptimal responses and advice on the mapleprimes forums.

There are still many fine responses, but slightly incorrect or inefficient (and sometimes outright wrong) responses seem to have been growing as a proportion of the whole. This is probably natural, as the mapleprimes site grows. But some of the ensuing bad effects of it could be avoided.

Hi, I want to carry out set-theoretic operations on real-line intervals.  For example

> [2,5] intersect [3,7];
 

Is there any package available for this and interval arithmetics?

Thanks.

In ?property > Description it is stated:

A property can be:
...
(2) most types (this includes constant values, for example, 0)

E.g. I can do:

assume(x,1):
about(x);

Originally x, renamed x~:
  is assumed to be: 1

is(x,1);
                                    true

But, I am missing a useful example for such a property.

Besides, I find these properties confusing as 0 and 1 have parent properties entries in the property lattice, but not 2:

This behaviour of 'assume' puzzles me ... 
and it needed some time to locate it
 
  restart; interface(version);

  Classic Worksheet Interface, Maple 12.00, Windows, Apr 10 2008 Build ID 347164

  assume(a::real); 
    #a:='a'; # activating removes the problem
  f0:=x+a; 
    #a:='a'; # that would not help - since is in use?
  assume(0<a);
  f:=collect(f0,x);

     ...

It would be nice to have a link to Recent posts off the main mapleprimes page that guests see (ie. even when not logged in).

It'd be a pity if the only reason that this is not available is just so that page can show how many new (unread by logged-in user) posts there are in each thread.

acer

Hi, I have a table of tables like the following one.

fss:= [{a, b, c}, table([e4 = table([a = .4, b = .7, c = 1]), e1 = table([a = .2, b = 0, c = .1]), e2 = table([a = .1, b = 1, c = .4])]), {e1, e2, e3, e4}];
 

Now I want to compute fss[2][e4][b]/2.0 but Maple does not recognize table entry as a number. What I should do? What is the reason for this behaviour?

I'm running into a problem with Maple where DotProduct seems to destroy the functions it assigns.

I ran a simple case, and it seemed to work just fine: (dotproductproblem.mw)

However, my code seems to follow the exact same logic but doesn't want to work? Code is a simple check that a bessel function solution of current density follows Maxwell's Equations. (Cylinder_AC_test2.mw)

Maple 11.

Has anyone encountered this problem before? Or know what's wrong in the code I'm running? (code attached)

Dear ODE enthusiasts and Maple developers,

I'm trying to do some differential geomery calculations and they are becoming outrageously large.  I'd like to use Maple's differential geometry package (tensor package), but it seems incapable of performing the calculations in an arbitrary number of dimensionis (i.e. with a fixed but arbitrary number of dimensions).  Does anyone know of a good package or tool to use for such work?

Hello,

Whenever I use the compiler in Maple 12 ...I get an error message that it cannot create a directory becuase of write permissions.  I have opened up all permissions that I can think of.  Am I missing something ??

Thanks

Hi, I am using the Rootfinding Isolate function to solve a system of polynomial equations. It works very well most of the time but ocasionally I get the following error message:

Error, (in RootFinding:-Isolate) Limit for allocations (1-->1000): in update_all_garbages !

Does anyone know what this means? - I assume it has something to do with the memory allocation.

Any ideas on how to prevent this error?

Thanks

Steve

Two very significant things happened last week. First, my son Eric turned 13. Second, I got a new car. These two milestones merged into a singularly great long weekend as Eric and did our very first father-son roadtrip to the great city of Cleveland. The car was the first new car my family had bought in about eight years, and as hard as I tried to maintain meaningful conversation with Eric through the many hours, I have to admit that my attention was frequently diverted to the car … thoughts of “hey … that’s a nice ride”, “so that’s what sport suspension feels like”, or “Yes Eric, that’s a very good question on the American election but … I wonder what that button does”.

Back to school, back to school, to prove to dad that I'm not a fool...(if you don't know what this is from, google it)

Well now that the school year has started, it's time to get the old grey matter going.  Now if you're a student on this board, there's a good chance that:

a) you know how to use Maple and are helping others out; or

b) you are not familiar with Maple and you want all the help you can get.

I'm assuming there are more people...