Maple includes a useful StringTools:-Entropy procedure which computes the Shannon Entropy, or Information Entropy of a string.  Wikipedia has a nice article describing the measure online at http://en.wikipedia.org/wiki/Shannon_entropy.  I wanted to compute this value over a Matrix so I wrote the following procedure.  Let me know if you have any comments or improvements on the implementation.

Maple Help (9.5) lists 15 coordinate systems, but provides no information on any of them.  I am of course familiar with the Cartesian and polar systems, so no additional information is required.  But I would like definitions for the other 13, e.g.,  Cassinian.

Allan

Because of John's answer to my last comment about a Maple wiki, I have searched first for antecedents in Maple Primes. From the many posts found in this search, I put together here what I consider the main points stated so far.

Oficial plans + technology:

http://www.mapleprimes.com/forum/how_do_we_grow_this_site

View button in the user account (right next to the name) points to the same page where it is located. What is the purpose of it then?

By the way, the user account page has quite a few errors in it. In IE7 it loads with a message "Done, but with errors on page" in the status bar, and Firefox outputs the following warnings and an error message in the error console:

Warning: Error in parsing value for property 'display'.  Declaration dropped.
Source File: http://www.mapleprimes.com/modules/system/defaults.css
Line: 43

I am trying to solve a one-dimensional heat equation problem with a piecewise continuous input of temperatures.  Dr.

The help page for  PDEtools,dsubs  says  "dsubs will substitute the left hand side of each substitution equation until this derivative is eliminated from the target"

Trying a subs like u'=u into the expression u'' gives u -- as it should:

PDEtools:-dsubs(diff(u(x),x) = u(x), diff(u(x),x,x));
                                    u(x)

I would like to use Maple to provide an independent check on a finite element model solution (ANSYS) of a thermal transient analysis of a reinforced concrete shell.  The following information is known about the shell:

The XMLTools package appears to use a DOM parser.  This requires that all of the XML data be loaded into memory and parsed before it can be used.  This is less efficient than a SAX or stream-based parser that operates on only parts of the XML tree at a time.  It would be a useful enhancment to include SAX based parsing in Maple.

Just a simple issue,

When I'm typing in an equation with a lot of brackets, maple automatically underlines the bracket set however if you are at the bottom of the screen the underline will not be visible.  This is just more of an annoyance than a problem.

Perhaps in an update maple could scroll the text up half of a space or so from the bottom of the screen?  or be able to at least scroll the data up the screen.

Hi, have a look at the pic. Maple has occasionally problems to combine solutions of an integral (and not only there) to a real term. One has to  do it by hand.  Are there any plans to improve this behaviour ?

I'm trying to install Maple 11 in a 64 bit Archlinux system.  The licensing software is only 32 bit, even though Maple itself is 64 bit.  All I needed to do to get around that is install 32 bit glibc libraries (pacman -S lib32-glibc for any Arch users)

Hi,

I just realized that Maple 8 shuts down without saving every time I try to save a document. Obviously, this is a very serious problem. Any tips? I actually uninstalled the whole software package, and reinstalled it, only to find that the problem was still there. I hope someone else has dealt with this. Please help. Thanks,

John

How can Maple arrive at the following, for an unspecified function f(x,y), without knowing sufficient conditions (eg. whether the 2nd partials are continuous)?

> # From the ?diff help-page
> diff(f(x,y),x,y) - diff(f(x,y),y,x);
                                      0

Continuity of integrands isn't generally assumed by int (there's a separate optional parameter which enables it...