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...

This is it… the big one: the nomination period is now open for the Maple Mentor of the Year.  The winner of this prestigious title will receive among other things, a trip to Maplesoft HQ in beautiful Waterloo.  Nominations will be accepted for the month of September, and the recipient will be announced in mid-October.

Does anyone remember (or have) that album?  Anyway, school has started, so summer is officially gone in the eyes of most.  With one more month gone, it’s time for another Mentor Award to be given out.  The recipient of the title Maple Mentor for the month of August, and all the riches and glory that accompany it, is Joe Riel.  Way to go Joe.
 

Keep on posting!

Maple says that the limit of sqrt(x), as x goes to 0, is 0, but Edwards of Larson et al. says that it isn't because "f(x) = sqrt(x) is not defined on an open interval containing 0 because the domain of f is x > = 0." 

 Comments?
 

Alla

Here is some standard alternative to Newton's method (and
thus may safe some homework ... so what). 

It will find a root of f (I think it must be continuous C^1)
in the interval ax ... bx, if it has different signs at the
boundaries.

The code is more or less translated from netlib C library
(or similar).

Usage:

  Digits:=16;

  f:= x -> exp(x)-Pi;
  zBrent( f, 0.0, 2.0);
  'f(%)': '%'= evalf(%);

Is there any software for converting a Fortran program to a Maple one? Is there any way for changing Fortran codes to Maple?

Hellooo!

I'm Working with this document (I attach it)

When I use with the right-click button the replace unit command in the last formula.....in the file it's  2389.194 kg/m replaced to units          t/m      and then save, maple crashes...why???

Hi,

I am developing a set of ODEs and constraints to be solved using the dsolve(MoLSYS, numeric, method=rosenbrock_dae).  The smallest system that I can set up to test my program is 3500 functions X 3500 equations.  Unfortunately, dsolve doesn't return any result or error of any kind, even after an hour.  Can anyone here please tell me the practical limit on the number of functions/equations that the DAE solver can handle?

Thank you,

PGK