There is a general problem which arises when one uses assume() that can be quite confusing. I seems that once an x~ is passed on by assigning a data structure containing it to another name, it becomes an entity on its own, a sort of vintage x~, with no connection back to the original variable on which the assumptions were made. It has no unique name and no way to access it for manipulation or redefinition. The code x:='x' does not affect these vintage x~'s. Even the function addionally() does not affect these vintage x~'s. Thus one can have a whole set of x~'s of different vintage in one's data structures with no way to tell them apart or manipulate them. This has tied some of my codes in knots before I realized what was happening. It would be so much less frustrating if each new vintage received a unique name that could be referenced by the user.

I have seen a number of forum questions concerning showing students the steps in a problem. There seems to be some confusion about how to do this reliabley and easily. A method I have found useful is seen below:

Hi everybody! I have to solve the following PDE (Heat equation), analytically or "numerically" (using a numeric method). My problem is mainly with the boundary conditions, which I don't know how to define: (1) U(x,t)'t = aU(x,t)''x (2) U(x,0) = T0 (3) -k*U'(0,t)x = q (4) -k*U'(d,t)x = h*(U(d,t)-T1) when a, TO, T1, k, q, d, and h are all constants! pay attention that the conditions (3) and (4) are on the derivative of U ! Thanks (: RedFox.

I have noticed that my text that was converted from MW to HTML is not properly displayed. If you look at the end of the text, you will se the command > f:=x->piecewise(x FSeries:=FSeriesOfFunction(f,-Pi..Pi); which is not correct. The part "FSeries:=FSeriesOfFunction(f,-Pi..Pi);" is the next command. View the original worksheet via the MapleNet to see the difference. The problem is in the symbol "lower than" (which appears in definition of the piecewise continous function), because the publication system (or what) thinks that it is the begining of an unsupported HTML tag and the "tag" is removed. The solution is to substitute "lower than" for "< ;" (without the white space before the semicolon) and maybe the same with the "grater than" symbol.

I have noticed, that a text, that was converted from MW to HTML is not correctly displayed. Link to my text is http://beta.mapleprimes.com/blog/karel-srot/computing-fourier-series-using-the-package-fourier If you look at the end of the text, you will se the command > f:=x->piecewise(x FSeries:=FSeriesOfFunction(f,-Pi..Pi); which is not correct. The text "FSeries:=FSeriesOfFunction(f,-Pi..Pi);" is the next command. View the original worksheet via the MapleNet to see the difference http://maplenet.maplesoft.com/maplenet/worksheet/mapleprimes/1280_examples1-executed.mw The problem is in displaying of the symbol "lower than" (which is in definition of piecewise continous function), because the publication system (or what) thinks that it is the begining of an unsupported HTML tag. What about to substitute "lower than" for "< ;" during the conversion (and the same for "grater than" symbol)?

by Karel Srot, Department of mathematics at Masaryk University, Czech Republic,

karels@mail.muni.cz, © 2005 Karel Srot

NOTE: This worksheet solves some examples using the package Fourier. This package provides procedures for computing Fourier series of real functions, drawing plots and animations. Especially animations illustrates the convergence of Fourier series in a comprehensive form. The usage of procedures from package Fourier is described in its help file.

The recent czech/english version of the package Fourier (as well as some exported examples) can be found at www.math.muni.cz/~xsrot/frady. Unfortunately, this website is only in czech at the present.

"Dios creo al mundo con el lenguaje de la matemática" Galileo

Continuing on the theme of the last poll on "pencil and paper", let's dig into the calculator scene a bit. In earlier times (i.e. 20 years ago), there were two types of calculators and calculator users: those who lived and breathed RPN and those who stared at RPN users in disbelief :-) Let's see what kind of calculator you are ... T4.

Maplesoft just released a new e-book called the Mathematics Survival Kit, adaptation of a popular reference book for high school and early collegiate math. It's a pretty interesting work in its writing style, content, and its use of Maple 10's document mode features. T4.

The next episode of the MapleCast podcast series is out. It's called "The Business of Math" and is a look at the non-technical side of the math software business. The guest speaker is Dr. Paul Bragg, a scientist who founded a major scientific sales business in England. T4.

The original orthonomalization procedure of Gram-Schmidt is numerical not stable. Therefore my question: Is the procedure which is implemented in Maple (Linear Algebra) the original Gram-Schmidt procedure or the modified Gram-Schmidt procedure, which is numerical (more) stable. Thanks in advance, Wolfgang

Maple seems to change from italic to normal font when I edit a command. This results in unrecognizable parameters. For example, putting the "1" in "p1" after the following command had been typed in, resulted in an error message: implicitplot3d([p1, p2], x=-7..7,y=-7..7,z=-7..7); Error, missing operation implicitplot3d([p 1, p2], x=-7..7,y=-7..7,z=-7..7); (p 1 being pointed out, and the 1 being non-italic.) Note: p1 and p2 were defined prior to the above command as: p1:=x+y+z = 1; p2:=x+z = 0; Why is this happening, and how can it be avoided?

Maple displays a defined procedure (yours or Maple's)as output when you enter definition or when you execute eval(

Hi all, I'm currently using the diffalg package to eliminate unknown signals and use the known ones for diagnosis (fault detection). At the moment, I have generated a lot of smaller equation systems from the large one I'm trying to diagnose. However, I get a lot of equation systems (too many to solve all of them), some goes very quickly to solve, others take a loooong time (too long for my poor computer). My question is, is there a way to "rank" the equation systems so I can start with the ones that have the highest probability to solve (other than the obvious number of equations in them)

After installing the critical security updates for Windows 2003 (August Bulletin) I've found that Maple 10 will no longer start. The splash screen appears though there is no progress bar. The splash screen (mws32.exe?) eventually dissapears silently leaving behind an orphaned maplew.exe.

Has anyone else had a similar experience with these updates?

Note: Classic Maple 10 starts with no problems.