Activity
From 17 Apr 2012 to 16 May 2012
16 May 2012
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18:20 Bug #110: Surprise return type for GCD of a list of ints
- JAA believes that *@myGcdInField@* was created for the following reason.
In CoCoALib fields satisfy *@IsGCDDomain@... -
16:15 Bug #110: Surprise return type for GCD of a list of ints
- > JAA thinks that
> *we can compute GCDs between values of type @RAT@*
> should be equivalent to
> *we can compute GC... -
- JAA thinks that
> *we can compute GCDs between values of type @RAT@*
should be equivalent to
> *we can compute... -
- There is one other imstance where @myGCDInField@ is called.
*@ex-RingElem1@* attempts to compute a GCD in a field (a... -
- JAA modified @RingBase::myGcdInField@ to give error rather than produce a result of 0/1. All CoCoALib tests passed, ...
15 May 2012
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- It seems to work OK for monomial ideals, but......
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- JAA cannot find the manual page for *@AsRAT@* (ditto *@AsINT@*).
The only occurrence in @CoCoAHelp.xml@ is in a @<s... -
- JAA has checked in the modified defn of *@AsRAT@*.
The question of the names of @AsRAT@ and @IsRational@ remains o... -
- John Abbott wrote:
> It seems reasonable to me that *@AsRAT@* give either error or a @RAT@ as result -- after all it ... -
- JAA has modified the defn of *@AsRAT@* so that it returns a @RAT@ even if the arg given was an @INT@. All the CoCoA-...
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- JAA was wondering how to convert a value of type @INT@ into the equivalent value of type @RAT@. Recall that arithmet...
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- *@AsRAT@* is defined at lines 31--39 of the file @NotBuiltin.cpkg5@.
[updating the defn should be pretty easy]
*B... -
- It seems reasonable to me that *@AsRAT@* give either error or a @RAT@ as result -- after all it is a sort of "cast". ...
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- In CoCoALib we have the function @myGcdInField@, so we can compute gcd of elements in RingQQ. So, what shouldwe do i...
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- The code now works: *@type(gcd([2,3,4])@* is of type @INT@.
Also @lcm@ has been fixed accordingly.
It does not se... -
14 May 2012
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- Anna thinks she can fix the reading of homogeneous lists; she will look into it in the next few days.
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- JAA thinks that introducing a separate name for the function for computing GCD of integers is a *bad* idea because it...
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- JAA proposes that reading of homogeneous lists have three possible return types:
* list of @INT@
* list of @RAT@
*... -
- Today some students passed with a CoCoA-5 problem which derived from the unexpected return type of *@gcd@* applied to...
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- What type should the result of *@AsRAT(3)@* have?
At the moment @AsRAT@ returns an *@INT@* if its arg is of type *...
02 May 2012
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- In emacs when an error occurs running code sent via C-c C-f (effectively "source") the user can use C-c C-p to go to ...
24 Apr 2012
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- If we change to "subscript" instead of index then we must change the name of the "index" field in the result of @Inde...
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- C5 inherited from C4 the name @IndetInd@. It is the function which produces a list of "indices" from a indet, _e.g._...
23 Apr 2012
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- Robbiano confirmed that the blank lines and prompts are a new "feature" of the C5 GUI produced recently by Abbott -- ...
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- Mac users expect to find drop down menus on the top menu bar.
CoCoA GUI offers no such menu for editing commands (su...
19 Apr 2012
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- The following input:...
18 Apr 2012
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- I sometimes have a similar problem with Firefox: if I double click on a @*.html@ file and Firefox was not already run...
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- After trying some possibilities, my preference is now for the reason to appear in brackets, like this:...
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- I suggest the following format for the error message:...
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- I agree that names exported from packages should be protected (probably with the reason being that it was exported fr...
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- Corrected erroneous actual parameters in a call in @ColonExpression:implEval@ in file @Interpreter.C@.
I simply co... -
- We cannot use the Iverson bracket syntax directly because it already has a meaning: @[N>0]@ will produce a list conta...
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- Re Automatic conversion:
* Advantages: no need to choose a name, compactness
* Disadvantages: possible ambiguity, uns... -
- JAA suggests that @BringIn@ should be simple rather than "clever". For instance it should give an error in the follo...
17 Apr 2012
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- Increased priority to "high".
Waiting for Anna's return to discuss the correctness/usefulness of allowing CoCoA-5 ... -
- Currently @BringIn@ does not allow one to move from char 0 to char non-zero....
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