In the following working Maple 11 worksheet an error ("Error, (in rtable/Product) invalid arguments") occurs if "array" is changed to "matrix". Also, if I change "Vector" to "array" I don't get the answer that I want. I get the same error if I use the Matrix Palette to define the matrix. View 4937_SE.mw on MapleNet or Download 4937_SE.mw
View file details Please help me understand these things better.

Does anyone know how to solve this equation 49x + 24y + 37z = 3778171

I have just noticed that user _JZlV_BjwBOR has just rocketted up the charts (with 39 points from 13 blog posts). Curious, since I did not remember seeing any such posts, I look at this user's blog and it is empty. What gives?

I wonder why

a,b := NULL,NULL:

does not work, leading to an error of ambiguous multiple assignment, whereas

a := NULL:
b := NULL:

does work. Nothing critical of course, just mysterious, or what?

Hi, When I click on the link titled 'here' in "Post a new comment" -> "Input Format" -> "Filtered HTML" -> "Allows use of and tags to enter 2D math here for help", I get a blank page http://www.mapleprimes.com/node/add/about/posting/math Does anyone know where I could get the relevant information? TIA, -- Jean-Marc

When I click on the "buttons" titled "About" or "Help" (on the top-right part of MaplePrimes pages), I get the following error message: "Access Denied Sorry, it looks like you do not have sufficient permissions to access this page [...]" Can someone else access the required pages or is it just me (something wrong with my account, perhaps)? (I use Firefox 2.0, Windows XP SP2, and I was logged into my MaplePrimes account when I tried.) Regards, -- Jean-Marc

Concerning custom indexing functions it seems that there is nothing analogous to TypeTools:-AddType(...), with which you can define new types as

TypeTools:-AddType(name,handler);

where, most importantly, name may be a variable. How can something similar (i.e., the name being given by a variable) be accomplished for new indexing functions when the only available option for defining those seems to be something like

`index/name` := proc()
   # something
end proc;

where name cannot be a variable?

I have Maple 11 installed on PC running on Vista, the classical version works fine, but the standard version doesn't. In fact I'm not even able to open it. I've tried uninstalling Maple 11 to reinstall it after but the uninstallation process doesn't run neither. I also tried reinstalling Maple 11 over my existing installation but the installation process shuts because Maple Reader is already installed. Now Maple 11 doesn't even display in my list of installed programs. How to get that fixed?

hari ini hari ahad.. saya kene kejut oleh razie.. die kate "ko lambat ke cepat..datang jugak".. kak site plak call"wei..cepat la datang...dr arsmah dah mengamuk".... setelah penat bertungkus lumus bersiap(walaupun tak mandi) aku pun sampai la kat fakulti kul 11 pagi(lambat 3 jam) cepat la abes bengkel nie next week nak kene present plak

hi..im a student from malaysia..

I realize that there is a small issue with maple. first I enter the following int(x^n,x) and I have the result x^(n+1)/(n+1) But this is correct only if I tell maple that n is not -1. Now I would that maple give a piecewise function as a solution to the above integral. Similarly, issue the command solve(sin(x)=0,x) and maple gives the answer 0. Well, that again is not right unless I specifically tell maple that I want my answer in [0,pi/2]. The same issue arises with other computations too. The CAS, Mupad 4.0 handles each of the above scenarios correctly.

How can I use an 'if clause function' in a summation? Suppose we have codes as follows: > Q[0]:=[0,0]:Q[1]:=[1,0]: > len:=A->sqrt(A[1]^2+A[2]^2): > kappa:=proc(y) local h;h:=[0,0];if y=h then 5; else 1/len(y);fi;end; > s:=R->sum(kappa(R-Q[n])*e(Q[n]),n=0..1): > s([1,0]); Error, (in NumericRange) summand is singular in the interval of summation It seems that when kappa comes into a summation form, it couldn't run the 'if clause'. What is my error in writing these codes?

Evaluate: lim [1/x * ( (a^x - 1) / (a-1) ) ] ^ 1/x x->infinity where a > 0 and a is not equal to 1

The tabbing nuisance, as earlier reported, is driving me crazy; it keeps popping up all the time. Not only when copy-pasting lines of codes to some new execution group, but also when saving, closing, and reopening the document. Please, help me by either telling me if you experience the same nuisances, or, better, how to circumvent these.

Following an idea of Peter Jäckel ("Probably the most complicated trivial issue in financial mathematics: how to compute Black's implied volatility robustly, simply, efficiently, and fast") it is shown, how an initial guess has to be taken to backout volatility from given option prices - with an astonishing good quality. The original uses more numerical computations, which I replace by Lambert's W function, Maple is of great help for that. In a second part the guess is refined to a numerical solution using Newton's method, where only some steps are needed to achieve machine precision: Through Lambert's function and an appropriate scaling about 3 steps are enough by using a higher order method.