Greetings, and one more question --
My build is now hanging waiting for input here:
unset DAASE; HTPATH=. FRICAS_INITFILE=''
/mnt/sda4/debian/fricas/target/x86_64-linux-gnu/bin/sman -noihere -paste
exdiff.ht
openServer result 0
FriCAS Computer Algebra System
Version: FriCAS 2022-07-16
Timestamp: Fri Jan 17 01:59:52 PM EST 2025
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making exdiff.input
parsing: ExDiffBasic
writing: differentiate(sin(x) * exp(x^2),x)
Thoughts?
Take care,
Camm Maguire <[email protected]> writes:
> Greetings, and please excuse the delayed reply.
>
> Waldek Hebisch <[email protected]> writes:
>
>> BTW: I have added a test for file operations and currently there
>> are several failures in GCL based FriCAS. One issue is that
>> FriCAS creates specialised array with element type '(UNSIGNED-BYTE 32)'.
>> GCL reports element type of the array as 'FIXNUM' and type
>> tests that FriCAS uses consider 'FIXNUM' as different from
>> '(UNSIGNED-BYTE 32)'. When reading from files FriCAS needs to
>> re-create array type, so currently writing of such arrays
>> fails. I can add 'FIXNUM' to the list of array element types
>> considerd by FriCAS, but I a bit worried if this does not lead
>> to wrong code somewhere else: FriCAS type machinery "knows"
>> that element type is '(UNSIGNED-BYTE 32)' and uses this type
>> for in declarations passed to Lisp. If I re-create the array
>> with element type 'FIXNUM', then formally types do not match
>> and there is potential for miscompilation. So, the question
>> is if specialized array having 'FIXNUM' as element type
>> is the same as specialized array having '(UNSIGNED-BYTE 32)'
>> as element type.
>
> In GCL 2.6.14, the array element types created when passing
> :element-type '(unsigned-byte 32) or :element-type 'fixnum to make-array
> are the same, and are indistinguishable if all the elements are.
>
> In 2.7.0, there is a separate type for the former. In general, in ANSI
> cl, implementations must "upgrade" element-types to a fixed lattice
> set, so you really only get the result of (upgrade-array-element-type
> type). On 64bit machines, in 2.7.0 the element types take 4 and 8 bytes
> respectively, while in 2.6.14 both take 8. You should be able to read
> and write these arrays without error in both cases. You won't be able
> to retrieve the element type you used to make the array with
> (array-element-type array), but rather just the upgraded type. This is
> always the case in any lisp.
>
>>
>> The second problem is that apparently GCL does not flush file
>> buffers on 'CLOSE'. Do I need to call 'FINISH-OUTPUT' before
>> 'CLOSE'?
>
> Do you have an example I can look into?
>
>>
>> The third problem is that apparently GCL writes wrong thing
>> which it can not read back. The Lisp expression is somewhat
>> complex, one can reproduce this from recent FriCAS using:
>>
>> kf := open("ts_kaf", "output")$KeyedAccessFile(None)
>> a3 : EXPR(INT) := exp(x) - 1
>> kf("a3") := a3 pretend None
>>
>> After that file 'ts_kaf/index.KAF' contains apparently wrong
>> S-expression. Reading it back via:
>>
>
> I can confirm this, and that it is absent in 2.7.0. I will investigate
> a patch and get back to you.
>
> Take care,
>
>> kr3 := kf("a3") pretend EXPR(INT)
>>
>> gives:
>>
>> >> System error:
>> SIMPLE-ERROR: #2= multiply defined
>>
>> and '#2' indeed seem to be multiply defined.
>>
>> I wrote "recent" FriCAS because there were changes on FriCAS
>> side which fixed some probles (and potentially may introduce
>> new bugs). However this problem is also present in GCL
>> compiled FriCAS 1.3.11.
>>
>> --
>> Waldek Hebisch
--
Camm Maguire [email protected]
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