MaplePrimes Posts

MaplePrimes Posts are for sharing your experiences, techniques and opinions about Maple, MapleSim and related products, as well as general interests in math and computing.

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  • Never Say Never The constant crying The late nights It’s all her fault We have to fight So many problems Getting lonely now Never able to see you Have to find a way somehow You’ve never fallen so quickly Like me more than a friend I’m sick of this pain It won’t work in the end Maybe one day we’ll meet in heaven Then we can be together forever No interruptions, no problems Never say never
    I found this today, probably a bug in MultiSeries :- series
    It appears that the environment vairable "_ans" acts in precisely the same way as the Ditto operator, "%." When was this implemented, and was it ever documented?
    I came across this interesting piece of reading, and thought I'd share it. It's an online version of the title, "The Mathematics of Gambling", by Dr. Edward Thorp. Although after browsing the web it was implied that Dr. Thorp was world renowned, I honestly knew nothing of him. You may also look him up on Wikipedia to find a link to this publication. Maybe some of you may find ways of applying Maple to some of the content in this book.
    It was said: "embarassing bugs have this way of getting fixed faster..." The last time I reported this bug, it was a bug in Maple 10, and I reported it in person to one of the GUI workers. If I wanted to report this bug privately again, I would use support@mapleprimes.com; however, this forum seems just as effective a means of conveyance. Anyway, there seems to be a bug, when using Maple's Classic interface, in the mechanism that redraws the screen. This is how the bug can be consistently replicated: On a new worksheet, type in and execute a command which will at least fill the entire screen with output. For example: 10000!; fills my screen and does not trigger elision.
    The title says it all - although in the documentation of the Maple Toolbox for Matlab you can read that it is fully compatible with Matlab's Symbolic Math Toolbox, this is actually not the case. So better do not expect that after you install the Maple Toolbox you'll be able to use your old m-files that worked OK with Symbolic Math Toolbox - they might work, if they rely only on the most basic features. However, as soon as you need anything a little bit more complicated, you'll experience a lot of difficulties. One example for all - with Symbolic Math Toolbox you can have: >> var_str = '[a; b]' % symbolic matrix represented as char
    I've been laying low for a while now, finding new ways to break and repair Maple. With Maple11, I've found at least two disturbing bugs. The first is in implicitplot(): Maple no longer allows for variable ranges that evaluate to numbers. In Maple10, the command plots[implicitplot](x^3=y-x, x=-5..5, y=0..x); plots correctly, whereas the same command in Maple11 results in the error message: "Error, (in plots/implicitplot) invalid input: invalid range for second variable" The second bug is yet another bug in Maple's eternally bug-ridden Worksheet package. I do not know if this bug exists in previous versions of Maple, but there is a problem reading in nested quotes. To see this bug, do the following:
    Hello. I have the MacIntel version of Maple 11 installed on a Macintosh Intel. When I start Maple and enter > 12345678901234567890; then Maple indicates "Evaluating" and the Memory and Time counters do not move. This goes on forever. When clicking the Stop icon, it becomes gray, but nothing else happens: "Evaluating" goes on and on. This only seems to happen when "Enable SMP support" is selected, and then happens every time. I have a MacBook Pro with an Intel Core Duo processor, so enabling SMP support seems sensible and should divide times by almost 2.
    Is there a feature that lets you know if and how many times an uploaded file was viewed, and downloaded by mapleprimes members ? I just personally would like to know how useful my blogs and postings are. (Vanity, I guess. :->). Also, on my last blog dealing with algebraic cryptography, after posting the maple worksheet I did not get the option of having being viewable on maplenet. The only option that was given was to download the actual maple worksheet. Can someone please look into this ? v/r,
    To check the correctness of the result given by maple it would be nice to integrate a theory prover capability in maple or give more support to work them together.
    The motivation for this worksheet comes through a discussion about coding a complex Gamma function for MPFR (which covers the real case) using a library for complex numbers. The suggestion was to use a general solution due to Spouge - it seems to be quite simple and it works in MPFR for the real case, some according code is given by Wilder. However I did not understand all the steps in Wilder's code (well, MPFR needs ugly looking code, not my personal taste) and more irritating I was not able to get reasonable results with Maple (no, I have not tried to use MPFR and am afraid of difficulties in doing that on Windows) in a systematic way.
    This is a request for the moderators/administrators. Is it possible for the administrators, or some responsible member of mapleprimes to issue periodic mathematical competitions ? Their relevance, and or dependence on Maple use is of no issue to me, and likewise for any rewards for the winners. My reason for asking is because I think it would help not just the participants, but everyone on mapleprimes to learn more about Maple. If I'm not mistaken, I think the makers of Matlab do something similar to this. v/r,
    I'm checking to see if this problem is still being worked on. At times I find that the reply box is shifted to the far right of the screen, sometimes cutting off any text that is typed in that area. I also posted an earlier complaint about this same problem. v/r,
    I would like to extract function with respect to the variables wich they are functions of in expressions of the form of e: e:= f(x)*g(y)*h(z); Thanks in advance
    Hello! I am very curious as to what algorithm Maple uses in Linear Solve. I have heard recently that some people do gaussian elimination (or maybe LU factorization) modulo some prime for exact arithmetic solvers and then reassmble the solution via Chinese Reminder theorem? I wonder if anyone has heard to this, or recommends this as a method for solving a system exactly? I have a very special, very large and sparse matrix with only -1,0, and +1. I would love to solve this matrix exactly, but regretfully is too large for Maple (up in the millions by millions). Would anyone have any references in literature for me in this area? Or perhaps maples LinearSolve uses a different exact-arithmetic algorithm?
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