When using matrix with real (non integers) coefficients, maple does significant mistakes.
Does somebody knows why?
I present the following:
[> restart;
[> a1:= foo = bar;
a1 := foo = bar
[> a2:= blam = foo = bar;
Error, `=` unexpected
[> a3:= blam = a1;
a3 := blam = (foo = bar)
The fact that the definition of
a2 (correctly) throws an error and the definition of
a3 does not can lead to some odd errors down the way. I disagree with Maple's choice not to say that the assignment of
a3 is in error.
Ok, I'm now using maple 11, previously i was using maple 8.
I'm trying to define a coordinate array, in this case i do this by setting the array,
Coords:=({x,y,z});
however maple 11 now seems to change the ordering of the array.
giving as output:
Coords := {y, z, x}
How do I make it stay as x,y,z?????
Why would it do this??
Maplesoft just launched a brand new section to our website, the Maple T.A. Content Center. This is a new site that contains great content that can be used in Maple T.A. The content center co-exists alongside the Maple Application Center as a dedicated location for Maple T.A. Content.
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The student is supposed to use the logistic differential equation given to them (with carrying capacity
.52e12),
dsolve() the differential equation with a specific initial condition, and then calculate the population at 3 different times. Notice what happens:
[> restart;
[> my_deq := (diff(P(t), t))/P(t) = .789*(1-P(t)/(.52*10^12));
d
-- P(t)
dt -11
my_deq := ------- = 0.789 - 0.1517307692 10 P(t)
P(t)
[> dsolve({my_deq,P(2290)=.83*10^10});
Why is it not possible to edit the root-post of a thread before anyone has replied to it?
I ask, of course, because sometimes, despite proofreading, I overlook typos or bad grammar (being Danish, the latter is quite often a bit difficult to avoid), or because I simply want to add additional material that comes to mind after having posted.
In the column "Replies" of "all recent posts" it is indicated whether there have been submitted new posts to the topic since the last login/visit.
Could such a thing be implemented also for the "my recent posts"? If affirmative, I think it would make it easier not to overlook any post which needed ones attention.
I am working on a new package, called "Spacetime", which I intend should be able to treat any physical field, either tensorial (integer-valued spin, like the photon) or spinorial (half-integer valued spin, like the electron) on any curved Riemannian manifold (gravity, according to Einstein).
Anyway, for the Maple specific part: I have decided to implement these general fields as multi-dimensional Arrays, analogous to the older package
"Gravitation", which "Spacetime" is intended to replace. They may have some symmetries and/or antisymmetries among their various indices. That part, that is, setting up the appropiate indexing functions, even in the general case, I have solved.
I submitted, to Maplesoft, a document that describes several bugs in Maple 11.01. A copy of the document is available here:
http://www.informath.org/maple/Problems-1101.mw
(Note: the document is about 900 kB, which is currently too large for MaplePrimes upload.)
The following system of equations can be solved by Maple 9.5 and Maple 10, but either takes a long time in Maple 11 or else simply won't solve. Is anyone else experiencing problems with the solve command? Earlier I noticed that Maple 11 was returning duplicates in solutions, but this is more serious. We tried this system on Maple 9.5 and Maple 10, and it solves easily, but on two computers with Maple 11, in classic worksheet mode, minutes went by with no solution.
{2*a[2,6]*a[2,9]-2*a[2,8]*a[2,9], 2*a[1,5]*a[3,1]+2*a[1,7]*a[3,1], 2*a[2,6]*a[3,4]-2*a[2,8]*a[3,4], 2*a[1,5]*a[2,1]+2*a[1,7]*
Under Maple 10, the command
densityplot(10-x-y, x = 0 .. 3, y = -x .. x, scaling = constrained, colorstyle = HUE, style = patchnogrid)
Got a Maple application that will knock our socks off? Something with cool images, elegant math, or just a great introduction to using Differential Equations? We want to see it!
Maplesoft is running a contest to find the best new Maple applications out there. To enter, simply contribute your document on the
Maple Application Center, including the line “The Maplesoft Great Application Contest” in the Comments box.
(However, all submissions to the Maple Application Center will automatically be considered.) Submissions must be received by January 15, 2008.
One grand prize will be awarded, consisting of one of:
Apple iPod Nano
Canon Powershot digital camera A460
4.5” (114mm) reflector telescope
Deluxe wooden chess set
Runner-up winners will receive their choice of:
Maplesoft laser pointer pen
Maplesoft mug
Maplesoft hat
Submission Guidelines:
Award-winning applications will:
Be created in Maple 11
Make use of the new Maple “Document Interface” including 2-D math input
Be well-formatted and laid out; for instance, you could use tables to format your document
They may additionally have some of the following characteristics:
Use Embedded Components
Use the “Point-and-Click” paradigm
Make sure your application includes instructions. Some things to consider while writing the instructions are whether the document can be modified and re-executed, if a user will interact with the document using Embedded Components, and whether a user needs to follow instructions to use interactive tools.
The following Maple documents are good examples of appropriate applications:
Hi,
is the JavaViewLib package 3.22 running with Maple 11?
After:
libname := "/home_zam/plch/maple/JavaViewLib", libname:
with(JavaViewLib):
(this works fine in Maple 10)
I received:
Warning, system/ssystem calls have been disabled in the options dialog.
Any suggestions?
With best regards.
Roman
I am pleased (and terrified) to announce the first public release of a Maple library for
high performance sparse polynomial arithmetic. This C library and Maple interface is under development at Simon Fraser University in Vancouver, Canada. We are releasing this interim version so that Maple enthusiasts and researchers can try it. Maple 11 is required.
I have twelve 4x4 matrices with specific complex-valued entries. I would like to know if they are linear independent over the reals. Is there some feature of Maple that enables me to do that easily?
I've tried adding together all the matrices, each separately multiplied by an unspecified algebraic number, and then to use solve(). But I don't trust the result, partly because it becomes rather tedious, partly because the package RealDomain, with which I've no experience, has to be invoked in order to avoid producing a false solution of linear dependence over the complex numbers.
I've also tried defining a 12x12 matrix consisting of bilinear traces of the matrices, analogous to the Cartan matrix in Lie algebra theory, and then taking the determinant to test for degeneracy.
