This is more of a blog entry, mostly a note to myself.

I wanted to generate a list of points on the surface of a deformed sphere. It turns out that Robert recently showed how to do that on a unit sphere.

http://www.mapleprimes.com/questions/35962-Limited-Random-Points-Plot-On-A-Surface#comment66936

Adapting his code is straightforward. So here is what I came up with. One proc generates the random points on the surface of the ellipsoid. Another proc generates...

A short remark. This would be a blog entry if those still existed.

I am comparing plot,options.

The style=point option has versatile options for symbols, their sizes, the number of points:

  , 'style' = point
  , 'numpoints' = 50 
  , 'symbol' = solidcircle
  , 'symbolsize' = 8

Hope the following statistics is of interest for the Maple community. Here are some data concerning the numbers of downloads of unlicensed copies from one of Russian torrents (see scrn1.doc , scrn2.doc , and scrn3.doc):
Maple 14 - 11.427
Mathematica 7 - 21.137.
In fact, the quantity for Mathematica 7 is  a...

The ability to color a 3D plot using a color function is geared more for functions of x and y only.

But quite often, the surface or pointwise 3D position of the plot is itself being specified as a height z which is a function of x and y. For the plot3d comand, that's pretty much the way it works (whether using an expression or a procedure).

So, of course, the very same rule that...

We have published an update to MaplePrimes today that addresses a number of reported issues with the site, and also introduces some new features.  Much of what has changed has been in direct response to your suggestions and feedback, and I sincereley thank you for that!  

Please note that we have plans to make other substantial changes in the not-too-distant future.  I have written in the past about improvements we want to make to search (including adding an advanced search feature...

Down votes seem to disappear and "Add to my favorites" is showing instead.

Sleep Sort is a hilarious (to me anyway) joke dressed up as a sorting algorithm.

Here it is in non-obfuscated (if somewhat garbagey) Maple code (need version 15 since it uses ?Threads,Sleep )

SleepSort := proc(L::list(posint),$)
local Lout, p, i;
    Lout := NULL;

    p := proc(n::posint,$)
        Threads:-Sleep(n);
        Lout := Lout, n;
    end proc:

    Threads:-Wait( seq( Threads:-Create( p(i...

for the record, I just discovered that while you can save a worksheet with a name like

mywork,mapleprimes.mw

you cannot open it (with Maple 15, June 2011)

Maple will return an error message like "file mapleprimes.mw could not be found" (swallowing up the "mywork," part of the name)

but if you rename it mywork-mapleprimes.mw

it will work fine.

In other words, do not insert commas in file names.

I do not know/remember if...

MapleSim has been delivering unique advantages in physical modeling and system simulation for many years. Today we release the latest iteration: MapleSim 5. Looking back at some of the earlier versions of our software, it is hard to believe that this is the same product; from the user interface to the component libraries to the simulation engine, every part of the system has experienced a striking evolution.

Like its predecessors, MapleSim 5 is based on the Maple mathematical...

The order of 1 in any finite field (that I tried) created by GF is NULL. For example,

F:=GF(3,2):
use F in order(one) end;

It should be 1.

Alec

Answering to that question, I posted several procedures finding minimal polynomials for the elements of finite fields. The best one was the following,

alias(a=RootOf(T^100+T^97+T^96+T^93+T^91+T^89+T^87+T^86+T^82+T^81+T^71+T^70+T^67+T^61+
T^60+T^57+T^54+T^53+T^52+T^49+T^48+T^45+T^44+T^42+T^39+T^36+T^33+T^32+T^31+T^29+T^28+T^27+
T^26+T^24+T^23+T^22+T^18+T^17+T^16+T^14+T^13+T^12+T^10+T^8+T^7+T^6+T^3+T+1)):

F:=GF(2,100,op(a)):
z:=F:-input(2):

MinPolyGF:=proc(x,y:=_X)
local A, i;
A:=Matrix(100,...

I recently stumbled upon a hypnotic video of 15 out-of-phase pendulums from a physics experiment at Harvard University.

The...

I'm learning to handle the output of pdsolve. It is a module and I'm quite new to that. The objective is to plot the solution for different values of, say, time t, in a fairly systematic way. I'll consign here my progress for reference. Feel free to comment if you have suggestions.

 sol := pdsolve
  ( diff(u(x, t), t) = (1/10)*(diff(u(x, t), x, x))
  , {u(0, t) = 0, u(x, 0) = 1, (D[1](u))(1, t) = 0}
  , numeric
  );

Introduction

The Magma package introduced in Maple 15 includes the command Enumerate. This routine allows you to count, or list, isomorphism class representatives of magmas of a given (small) order satisfying a selection of properties that...