## Plot Dirac. Graphic of an impulse train. Fourier...

by: Maple

Consider a signal which is a real sine series, f(x)=2*sin(2*Pi*x) + 5*sin(2*Pi*6*x) + 9*sin(2*Pi*11*x).

Let F(w) be its Fourier transform. Answer F(w) is purely complex and expressed in terms of symbol Dirac.

Maple "plot" fails.

Plots of impulse trains like F(w)=sqrt(Pi)*I*(2*Dirac(w-Pi)+4*Dirac(w-4*Pi)) involve user intervention. Maple won't plot such expressions, because they are DISTRIBUTIONS (not FUNCTIONS).

Try plotting F(w) to see the engine's uninformative error message....

by:

## Answers by date in reverse is ridiculous

by:

The new option added to MaplePrimes about two hours ago----to show Answers by date----only shows the Answers in reverse chronologocal order. That's ridiculous! Even more so with the comments still being in forward chronological order. The reason that people have requested date order so vehemently is to preserve the continuity of conversation. With the reverse chronological order, the continuity is worse than before.

by:

Earlier this afternoon we made an update to MaplePrimes to introduce some new features and to squash a few bugs.

The primary purpose of the update was to improve the context around how replies and answers are entered on MaplePrimes. The most significant change you will notice here is that submission/edit boxes now appear inline  under the specific message you are replying to, instead of at the bottom of each page.

Other improvements include:

## Mapleprimes timing is off

For reference this question was posted exactly 9:05

## calculating a sum symbolically

by:

Dear friends,

I have recently been calculating a sum from this link.

The problem here is to calculate the sum sum_{n>=1} (-1)^(n+1)/(n^2+a) with a some positive real number. You probably all agree that it is preferable to express it using elementary functions from basic calculus as opposed to the Gamma, Zeta and Digamma...

## 'Logout' does not logout ?

by:

I just posted and then clicked 'logout' (upper right on the page).

After going back I recognize I am still logged in. Strange. Does
the page not clear the data (= cookies?) for that demand?

## more contour integration issues

by: Maple

Hello all,

I recently helped someone with a contour integration problem, you may find my calculation at the following link. It occurred to me to test this integral with Maple and Mathematica.

For example,

`int(1/x^(1/3)/(x^2+2*x*cos(Pi/7)+1), x=0..infinity);`

produces an unusable output from Mathematica. Maple is a little better,...

## Mapleprimes wish list

Stop ordering posts by votes! ... For two reasons.

1 - Someone who comes up with the idea first should be ordered as such.

2 - Conversations can get mixed up

**edit change** I have changed the title from Stop ordering posts by votes to Mapleprimes wish list.

## mapleprimes spam attack

A lot of spam coming in is from the same users.  It seems automated.  These are some repeating offenders

bow1461923
crowjs5668
maciea9490
chrisb4474
katiaa8835
jillrq6414
wirthd7705
angel11852
roseua4338
dickny9737
cat8665870
kelly12568
eckerf1684
clinep7786
sheppa9191
pettyd5076
buccik7294
ariasc3543

Those are to name a few.

Higher power mapleprime users can delete posts,...

## Maple file viewer?

Maple 2017

Hello. It World be greate if you could ad a maple file viewer to the Maple Player for the IPad and similar products. It is a greate tool when you are on the move and do not have you pc with you to do the calculations on. I use Maple a lot at my studies at the university of southern denmark, at when I talk to my study mates about a problem, it would be greate to be able to open maple files from you pc on the ipad. I save my documents to my Dropbox, so I always have then nearby....

## Logout - but still logged in

by:

Saying 'logout' through the menu bar does not log me out.

I am still logged in (even after leaving the pages).

And I guess, that the according cookie is not properly cleared.
But it should.

## Maplesoft application center sorting

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...

by:

This is a problem I've had with the new mapleprimes. Contributions listed as "answers" to a question are listed according to the number of votes they receive. This is a system used on forums like mathoverflow, for instance, websites designed to provide answers to specific questions, websites where "discussions" are discouraged. But, in my opinion, mapleprimes is both a discussion and question/answer forum and the "rank by vote" is not suited to it.

In the example I...

## Lost in mapleprimes traffic

I am finding, if you add to an old question directed towards someone at maplesoft before the weekend but after a maplesoft business day has ended, your question may not be answered or addressed. This is because your new question in the thread has been swamped by newer questions and yours has trickled down the list and essentially becomes buried or lost.

I also find too much information related to posted questions are being summarized in the top level making it...

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