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Recently, I published the following paper.

"Calibration of a radiocarbon age", Nonlinear Processes in Geophysics, 19: 345–350 (2012).

The paper explains that all radiocarbon dates are inaccurate, due to an error in the handling of the statistics.

The paper has a Supplement, which includes a program to do the statistics correctly:

Bessel Limit Bug...

September 07 2012 edgar 619 Maple

I guess there is a limit bug here somewhere.  With MultiSeries things are OK...

L:=(x*BesselI(k-1, x)+x*BesselI(k+1, x))*BesselI(-k, x);
L := (x BesselI(k - 1, x) + x BesselI(k + 1, x)) BesselI(-k, x)
simplify(limit(L,x=0)) assuming k>0;
0
with(MultiSeries): simplify(limit(L,x=0)) assuming k>0;
2 sin(Pi k)
-----------
Pi

BesselLimit.mw

This is a comment and warning to anyone in the United States using MapleTA 8. 

If you get login information using LDAP, MapleTA 8 gets the "employee number" from the LDAP data base  and displays it on the screen when a person is logged in.  After talking to our IT people, they acknowledge that this is a FERPA violation when using MapleTA in a lab where people can see screens of other people's computers.

Our IT people have contacted Maplesoft for...

MapleSim has seen a rapid evolution since its inception in 2008 as a multi-domain system-level modeling and simulation environment. Market response has been outstanding: Maplesoft has been working with an expanding list of key industry players such as AISIN AW Co., Ltd. and B&R,  while major customers like

Viewing an html application at the application center results in some problems which doesn't allow to view the application in it's html format.

I had responded to a maplesoft application where data to a .mw worksheet was no longer available and had asked them to find and fix it.

I would have hoped a response would have been put here to mapleprimes to find the data.  Unfotunately the data could not be found and the application was deleted from the application center. 

It was Analyzing Data files in Maple - Maple 10 and Maple Net - Nov 7, 2005

Here is the link http://www.maplesoft.com/applications/view.aspx?SID=1685 ...

After making a search for applications in the applications center, they are ordered in some crazy unknown way. 

They do not appear to be ordered alphabetically by author, nor by title and also they have no date published attached to the searched list. 

Searching for all titles by product Maple 16, we find that TEST APPLICATION created July 31 is actually listed behind Robert Lopez's Classroom Tips and Techniques: Slider-Control of Parameters in Numeric...

MapleSim now is in direct competition with Mathematica's System modeller.

I just found that out now, it could have been out for a while but they look similar.  Mathematica is already comparing it with MapleSim and essentially indicating that their modeller is superior.

Let's hear from the Maple crowd.  Is System Modeller better than MapleSim?

There is a flaw (bug) in the DEplot routine.  If you load the plottools package before using DEplot with the arrows=line option, the DEplot routine tries to use the line definition from the plottools package.  A worksheet illustrating this problem is below.

It appears the wikipedia entry for maple software is deeply in need of an overhaul to reflect new graphic modifications and for better eye candy. 

Not that it really matters but the graphics there are rather primitive and outdated. 

When using "plotsetup(png,...)" the third rotational angle is ignored.  Attached are a worksheet and the corresponding three plots that demonstrate this bug.

The explosion of cloud this - cloud that, is rather obvious now.

 

SO, I decided to check-out the cloud feature to my Maple? One problem, I cannot see - what is in it?

  • Yes, I understand, you use the cloud palette in Maple.
  • It shows the group, who the document / notebook is from, what it's title is? And such.
  • _
  • BUT, is there a web page - listing? hidden somewhere, on MaplePrimes or someplace on Maplesoft's service? (

Some Maplesoft users have been receiving emails that indicate a new patch for Maple software is available. Recipients of this message receive an attachment called Maple_Patch.zip which they are asked to extract using the password MapleSecuirityUpdate1707. Please be advised that this patch did not originate from Maplesoft and should not be opened under any circumstances. Maplesoft is currently investigating further. Please contact

The MRB constant can be computed in Maple by evalf(sum((-1)^n*(n^(1/n)-1),n=1..infinity)).

On my laptop restart; st := time(); evalf(sum((-1)^n*(n^(1/n)-1), n = 1 .. infinity), 500); time()-st gives a timming of 37.908 seconds.

Using the procedure posted at the bottom of this message st := time(); A037077(500); time()-st gives a much faster timing of 1.903 seconds.

My fastest timing for 500 digits of MRB comes from my...

Here is a hacked-up and short `convert/identifier` procedure.

The shortness of the procedure should is a hint that it's not super robust. But it can be handy, in some simple display situations.

If I had made into a single procedure (named `G`, or whatever) then I could have declared its first parameter as x::uneval and thus avoided the need for placing single-right (uneval) quotes around certain examples. But for fun I wanted it to be an extension of `convert`. And while I could code special-evaluation rules on my `convert` extension I suppose that there no point in doing so since `convert` itself doesn't have such rules.

For the first two examples below I also typed in the equivalent expressions in 2D Math input mode, and then used the right-click context-menu to convert to Atomic Identifier. Some simple items come out the same, while some other come out with a different underlying structure and display.

 

restart:

`convert/identifier`:=proc(x)
   cat(`#`,convert(convert(:-Typesetting:-Typeset(x),`global`),name));
end proc:

convert( 'sqrt(4)', identifier);

`#msqrt(mn("4"))`

eval(value(%));
lprint(%);

`#msqrt(mn("4"))`

`#msqrt(mn("4"))`

`#msqrt(mn("4"))`

`#msqrt(mn("4"))`

lprint(%);

`#msqrt(mn("4"))`

convert( 'int(BesselJ(0,Pi*sqrt(t)),t)', identifier);

`#mrow(mo("∫"),mrow(msub(mi("J",fontstyle = "normal",msemantics = "BesselJ"),mn("0")),mo("⁡"),mfenced(mrow(mi("π"),mo("⁢"),msqrt(mi("t"))))),mspace(width = "0.3em"),mo("ⅆ"),mi("t"))`

eval(value(%));
#lprint(%);

`#mrow(mo("∫"),mrow(msub(mi("J",fontstyle = "normal",msemantics = "BesselJ"),mn("0")),mo("⁡"),mfenced(mrow(mi("π"),mo("⁢"),msqrt(mi("t"))))),mspace(width = "0.3em"),mo("ⅆ"),mi("t"))`

`#mrow(mo("∫"),msub(mo("J"),mn("0")),mfenced(mrow(mi("π",fontstyle = "normal"),mo("⁢"),msqrt(mi("t")))),mo("⁢"),mo("ⅆ"),mi("t"))`

`#mrow(mo("∫"),msub(mo("J"),mn("0")),mfenced(mrow(mi("π",fontstyle = "normal"),mo("⁢"),msqrt(mi("t")))),mo("⁢"),mo("ⅆ"),mi("t"))`

#lprint(%);

convert( Vector[row](['Zeta(0.5)', a.b.c, 'limit(sin(x)/x,x=0)', q*s*t]), identifier);

Vector[row](4, {(1) = Zeta(.5), (2) = a.b.c, (3) = limit(sin(x)/x, x = 0), (4) = q*s*t})

eval(value(%));
#lprint(%);

Vector[row](4, {(1) = Zeta(.5), (2) = a.b.c, (3) = limit(sin(x)/x, x = 0), (4) = q*s*t})

 

Download atomic1.mw

As it stands this hack may be useful in a pinch for demos and purely visual effect, but unless it's robustified then it won't allow you to programmatically generate atomic names which match and inter-operate computationally with those from the context-menu conversion. Identifiers (names) with similar typeset appearance still have to match exactly if they are to be properly compared, added, subtracted with each other.

Extra points for commenting that the round-brackets (eg. in function-application) are displayed as black while the rest is in blue by default, if you have a workaround.  That also happens when using the usual context-menu driven convert-to-atomic-identifier of the Standard GUI.

Extra points for noticing that function names like `sin` are italicized and not in an upright font, if you have a workaround. How to discern which instances of fontstyle="normal" should be removed?

Points off for commenting that this whole hack doesn't provide anything new or extra for getting around automatic simplification.  :)

This is a one-liner hack. But maybe together we could turn it into something that closely matched what the context-menu generates.

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