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kolli kavita | 3 Nov 2004 04:16
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Question:TimeStamp

hi,

Is there a system clock in powerloom. Are there any
commands that use time like before, after where i can
compare two time stamps. Please let me know this.

Thanks.

kolli

		
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kolli kavita | 3 Nov 2004 04:16
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Question:TimeStamp

hi,

Is there a system clock in powerloom. Are there any
commands that use time like before, after where i can
compare two time stamps. Please let me know this.

Thanks.

kolli

		
__________________________________ 
Do you Yahoo!? 
Check out the new Yahoo! Front Page. 
www.yahoo.com
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kolli kavita | 4 Nov 2004 00:28
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Basic Question: Comparision and Arithmetic operators

hi,

could someone help me solving this. Are there any
comparison operators like <,>,=.....(like 30<45) and
so on. I need to use the difference of two numbers in
the command. Does powerloom support such arithmetic
operations. If someone knows the answer please let me
know and please provide me with an example too if its
not too much.

Thanks.

Kolli

		
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Octav Popescu | 4 Nov 2004 01:23
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Re: Basic Question: Comparision and Arithmetic operators

Take a look at pl-kernel-kb.ste. Search for "Arithmetic Relations and 
Functions". There's also an '=' and a 'DIFFERENT' relation, which work for 
more than just numbers.

Octav

--On Wednesday, November 03, 2004 15:28 -0800 kolli kavita 
<lovelykavitha <at> yahoo.com> wrote:

> hi,
>
> could someone help me solving this. Are there any
> comparison operators like <,>,=.....(like 30<45) and
> so on. I need to use the difference of two numbers in
> the command. Does powerloom support such arithmetic
> operations. If someone knows the answer please let me
> know and please provide me with an example too if its
> not too much.
>
> Thanks.
>
> Kolli
>
>
> 		
> __________________________________
> Do you Yahoo!?
> Check out the new Yahoo! Front Page.
> www.yahoo.com
>
(Continue reading)

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Thomas Russ | 4 Nov 2004 01:38
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Re: Basic Question: Comparision and Arithmetic operators


On Nov 3, 2004, at 3:28 PM, kolli kavita wrote:

> hi,
>
> could someone help me solving this. Are there any
> comparison operators like <,>,=.....(like 30<45) and
> so on. I need to use the difference of two numbers in
> the command. Does powerloom support such arithmetic
> operations. If someone knows the answer please let me
> know and please provide me with an example too if its
> not too much.

Yes, these operations are built in.  Like the rest of
PowerLoom, prefix notation is used.  Arithmetic operations
are actually implemented as constraints, so a single
unbound variable in any position is supported.

If you look at the number of employees section of the
tutorial in the PowerLoom manual, you will also see some
sections on the arithmetic comparisons.

Examples follow:

|= (ask (< 40 50))

Processing check-types agenda...
TRUE

|= (ask (< 50 40))
(Continue reading)

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Thomas Russ | 4 Nov 2004 03:22
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Re: Question:TimeStamp


On Nov 2, 2004, at 7:16 PM, kolli kavita wrote:

> hi,
>
> Is there a system clock in powerloom. Are there any
> commands that use time like before, after where i can
> compare two time stamps. Please let me know this.

There are the basic functions in the underlying Stella system that 
would allow for this type of reasoning.  In our internal research 
version we also have developed PowerLoom level access for specific 
timepoint reasoning that will do this as well -- but that will need to 
await the next release of PowerLoom.  We hope to have that out around 
the end of this year, but are a bit short of time to go through the 
release, documentation and testing process.

Unfortunately, the timepoint reasoning code does rely on some updates 
to both PowerLoom and Stella, so it can't be easily added to the 3.0.2 
version.

As a preview of what would be supported in the next version of 
PowerLoom, I offer the following trace:

? (deffunction timestamp-of (?x ?y))
|f|TIMESTAMP-OF

? (assert (timestamp-of this (timepoint-kb/timepoint-of "now")))
|P|(= (TIMESTAMP-OF THIS) (/TIMEPOINT-KB/TIMEPOINT-OF now))
(Continue reading)

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Gmane