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Joe Riel

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20 years, 8 days
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These are replies submitted by Joe Riel

pre tag...

Joe Riel 9660
June 21 2007
0 0
Unless something has recently changed, using a <pre> tag won't, alas, solve the problem. Note that a semicolon has to be appended, that is: < = &lt;.

pre tag...

Joe Riel 9660
June 21 2007
Unless something has recently changed, using a <pre> tag won't, alas, solve the problem. Note that a semicolon has to be appended, that is: < = &lt;.

ampersand...

Joe Riel 9660
June 07 2007
Use `&amp;' to create an ampersand. Or change the format to "Plain Text".

Hmmm....

Joe Riel 9660
June 03 2007
0 0
Okay, I just wanted to verify which GUI you were having the problem with. I have a standard (104 key) keyboard, the group of four arrow keys immediately to the right of the main layout work fine in the classic gui on my debian box. I've remapped the arrow keys that are in the numeric keypad, so they don't have any effect in Maple (or other applications).

Hmmm....

Joe Riel 9660
June 03 2007
Okay, I just wanted to verify which GUI you were having the problem with. I have a standard (104 key) keyboard, the group of four arrow keys immediately to the right of the main layout work fine in the classic gui on my debian box. I've remapped the arrow keys that are in the numeric keypad, so they don't have any effect in Maple (or other applications).

function types......

Joe Riel 9660
June 01 2007
An expression of type 'function' has a specific meaning in Maple (see ?type,function) which does not match the usual notion in mathematics. It's not clear to me what you want to do. If your goal is to convert a product expression (expression of type `*`) into its terms, just use op:
op(e);
                   3 /d      \2      2 /d      \2     /d      \2       2
       exp(-2 y), s  |-- U(s)|  + 2 s  |-- U(s)|  + s |-- U(s)|  + U(s)
                     \ds     /         \ds     /      \ds     /

type,structure...

Joe Riel 9660
June 01 2007
Nicer, or at least more specific, is 
indets(e, anyfunc(identical(x)));
                                   {f(x)}
The help page ?type,structure describes the various and useful structured types.

trivial improvement...

Joe Riel 9660
June 01 2007
0 0
A minor point. Rather than 
plot(y->f(y), 0..2)
one can do
plot(f, 0..2)
As you mentioned, there isn't much reason for f, that is
plot(test, 0..2)
should work fine.

trivial improvement...

Joe Riel 9660
June 01 2007
A minor point. Rather than 
plot(y->f(y), 0..2)
one can do
plot(f, 0..2)
As you mentioned, there isn't much reason for f, that is
plot(test, 0..2)
should work fine.

quitting...

Joe Riel 9660
May 31 2007
Personally, I find it strange that there are three builtins for exiting cmaple: done, stop, and quit. Annoyingly, I invariably type "exit". Here's another way 
subs(_=sscanf(D,%m)[], proc() _ end)();

plotsetup and tty maple...

Joe Riel 9660
May 30 2007
I see. I was executing the commands from tty maple (command-line maple). When executed from Standard Maple I do, indeed, get the border.

user 0?...

Joe Riel 9660
May 29 2007
What about user 0? There was a single entry for "him" in the first data you posted.

thanks...

Joe Riel 9660
May 29 2007
Thanks, that does the trick. I assume that the timestamp in the file is the typical Unix timestamp (seconds from epoch) which means the data is from June 28, 2005 to May 27, 2007, which covers almost the entire life of MaplePrimes. So I don't understand why there are so few entries in the log (e.g, Will, user 1, has 111, which is way off).

interpretation of posting data...

Joe Riel 9660
May 29 2007
What is the meaning of "posting ID" and how do we correlate a user ID with a name (or vice-versa)? What posts are included? I notice that the user with the greatest number of posts has 128 (from the csv file), which is considerably less than total number of posts by you (Will) or any of the other top posters.

But some bugs are features...

Joe Riel 9660
May 24 2007
The help page for pointto, part of the "hackware" package, is rather clear: 
- Extreme care is required when using these functions, because their use can
  lead to various types of unrecoverable internal errors.
However, the help for sscanf with the %m format is not so cautious. It doesn't mention that there could be serious problems if the input string (I used names to reduce character count) is invalid .m format. Some interesting effects can be achieved with this command. For example, 
Rational := proc(num::integer, den::integer)
    sscanf(sprintf("#%m%m",num,den),"%m")[]
end proc:
x := Rational(4,-4);
                      x := 4/-4
-2*x;
                       -4/-2
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