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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  • The map function is a particularly useful Maple function. I use it frequently and thought I understood how it worked. However, I recently discovered an interesting feature of mapping over vectors, matrices, Vectors, and Matrices. That is, the order of application of the mapped function depends on the data type and may be indeterminate (for table based structures).
    Hello All: I am working on generating some correlated sequences using Matrix Exponential techniques. there seems to be some problem with the way maple manages memory (or am i doing something wrong?). specifically, in the code below, i am calling a few functions inside a for loop but none recursively. so as the for loop progresses my stack (memory; seen as PF Usage in win XP) size should not really blow up. right? but in Maple 9.0 and 10.0 this below program would give a "Execution stopped: stack limit reached." exception after about 30000 executions(I am running on a WinXP machine , about 2.8GHz, with 512 MB RAM, also checked on a machine with 1 GB Ram; and another 1GB in page file size). But the same program seems to work alright on the same machines with Maple8 running (i uninstalled maple-9 and installed maple-8 in one case). I could go up to 300,000 iterations without any problem. And the memory would go from about 250MB (PF Usage) to about 800MB. So even in Maple 8 there is some stuff that is being dumped on the stack; i tried to run Garbage collector (gc()) function once every 500 iterations; it did not make any difference either. Can anyone please look into it?
    Hi, Colleagues, I wonder if sombody has developed a Maple code for parameter continuation of codim 1 & 2? Evgeni
    Hi, Colleagues, I need to use two colors for positive and negative values of a plotted function and I am trying to use a piecewise switch. My atempt was something like plot(sin(x), x=0..13, color=(x->piecewise(sin(x)
    This blog entry evolved from my reply to Moira Chas's post. I want to thank her for initiating such an interesting topic. Usually Mandelbrot set is drawn in Maple using plot3d command. That also can be done using densityplot. In the example below I use mandelbrot from John Oprea's worksheet,
    mandelbrot := proc(x, y) 
    local c, z, m; 
    c := evalf(x+y*I); z := c; 
    for m to 50 while abs(z) < 2 do z := z^2+c od; 
    m end;
    
    plots[densityplot](mandelbrot,-2 .. 0.7, -1.35 .. 1.35,
    s_tyle=patchnogrid,colorstyle=HUE,numpoints=62500,axes=none);
    Hi, Colleagues, I need strongly reduce Maple generated graphs for a journal publication. How could I make the axes and tickmarks thicker? Thanks, Evgeni
    SOS! I need to find how to plot y=f(x) if x and y are columns of 2D matrix. Thanks, Evgeni
    Is it possible to solve integration with derivatives and unknown functions inside the integral... I am trying to solve the integral > int((diff(a(x),x,x))*(diff(u[1](x),x,x,x,x))*u[2](x)+((u[1](x))*(u[2](x)))*b(x),x=0..L); where u[1](x), u[2](x), a(x), and b(x) are unknown functions of x, and it keeps giving me back the integral... Is it possible...
    When entering 2D Math I occasionally like to make a character non-italic and Bold. The help files explain how to do this several different ways. The changes do appear on the screen before and after the worksheet is saved. When the worksheet is closed and opened again, the format changes are gone. It would appear that typesetting rules are taking over so what the help pages say under the topic '2D Math' is not what happens in practice. Bug? Feature? Workaround?
    FYI, Maplesoft just announced the Japanese language edition of Maple 10. Maple has had a Japanese version since Maple V Release 5 (circ. 1998 I believe).
    The help page ?UndocumentedNames lists a few of the undocumented procedures in Maple. For example: inner - computes the inner product (dot product) of two lists MorrBrilCull - subroutine used by ifactor evalgf1 - used by `mod/Gcd` etc.
    I just tried to download a copy of a worksheet from a MaplePrimes posting. The file has a .mw extension and does contain a Maple worksheet. However, when I clicked on "download the worksheet" (or words to that effect) I saw the raw worksheet file displayed in my browser - I would prefer to have the worksheet open in Maple (or allow me to save it to my local disk). The HTML code that provided the link to the worksheet was created automatically by the "convert worksheet" utility available within MaplePrimes (http://beta.mapleprimes.com/mwconvert/). My conjecture is that the MaplePrimes server is not sending out .mw files with a MIME type that allows my browser to recognize it as a Maple worksheet. I believe the correct MIME type is application/maple.
    Similarly to Binary Arithmetic, Octal Arithmetic can be done using following module,
    Silvexil announced in his blog a Binary Arithmetic package. Here is my version of it.
    It seems that the posting timestamp is an hour off: my last post appeared to have been posted an hour earlier than it was.
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