Carl Love

Carl Love

20539 Reputation

24 Badges

8 years, 143 days
Mt Laurel, New Jersey, United States
My name was formerly Carl Devore.

MaplePrimes Activity


These are questions asked by Carl Love

It's been about a year since I've been able to display any worksheet at all on MaplePrimes. In the example below, I took a very simple worksheet that had been displayed in an Answer to another recent Question and tried to upload it. So, we know that it's somehow possible to display this particular worksheet on MaplePrimes.

Maple Worksheet - Error
Failed to load the worksheet /maplenet/convert/prove.mw .
Download prove.mw

[Perhaps this should be a Post rather than a Question.]

As far as I can tell, RootOf is the only Maple command that takes a bound variable on input and returns an unevaluated form with the bound variable renamed (to _Z). Why is that? Either all should do it (definite integrals, limit, sum, etc.) or none should. 

Pros:

Making a substitution for a variable that occurs both free and bound in the same expression is a major source of programming error. Renaming bound variables helps to ameliorate that. 

Cons:

The unexpected appearance of _Z in their results seems to be a great source of confusion to new users. However, if more commands did this, perhaps it would be more expected.

Feel free to start a brainstorming discussion on this, as if it were a Post, even if you don't have a direct Answer for the Question. If that's the way that the thread heads, I'll change it to a Post.

The help for option threadsafe (on page ?option) includes this sentence: 

  • Portions of the kernel may recognize this option and allow the procedure to be called in multiple threads simultaneously.

Huh? What exactly does that mean? Isn't it already capable of being called in multiple threads simultaneously?

I understand the significance of this option for procedures to be compiled, mentioned later in the same paragraph. But is there any benefit for a non-compiled procedure that will be used in multithreaded code? If my code has numerous one-liner arrow procedures, is there any point to cluttering up my code by turning them all into procs with option threadsafe? (Y'all know how I hate cluttered code.)

I want to set up an RSS or IFTTT so that I get a notification on my phone whenever there's something new in the Active Conversations stack. My phone uses Google Android. I'd prefer to not need to rely on email/gmail for the notification; something more endogenous to Android would be preferable. I've never used RSS or IFTTT, so detailed instructions are preferable.

Can anyone explain the reasoning that went into the programming decisions that led Maple to give these results?

restart:
is(-infinity, complex); #expected: false
                             false 
is(-infinity-I*infinity, complex); #expected: false
                              true
exp(-infinity - I) = limit(exp(x-I), x= -infinity); #expected: 0=0
                         infinity*I = 0
is(exp(x)<>0) assuming x::complex; #expected: true
                             false
is(exp(x)<>0) assuming x::real; #expected: true
                              true
coulditbe(exp(x)=0) assuming x::complex; #expected: false
                              true

 

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