You can't type a fact directly at the prompt. You can add a fact to
working memory using the (assert) function (as shown in section 5.2) or
you can use the (deffacts) construct to create a group of facts that will
then be added to working memory on reset events (as in section 5.5) .
As a general rule, in the HTML manual, the light red blocks show
interactive sessions with Jess -- things you can type directly at the
prompt -- while the green ones do not. The red ones show the actual
Jess prompt; the number fact you typed in below is from a green
block, and is meant to indicate how the fact data structures look. There
are also violet-colored blocks: those are compilable Java code.
I'm actually rather proud of what the Jess test suite does to verify the
manual. The dialogs in the red blocks are actually parsed from the XML
source of the manual and verified: if one of the red blocks says that Jess
gives a particular response to a given input, that is actually verified in
the test suite. Likewise, the code in the violet blocks is compiled, and
if output is shown in the manual, the output is verified correct. The
green boxes are the escape mechanism: they can contain pretty much
anything, and no validation is done on them.
On 10/11/12 4:43 PM, Grant Rettke gret...@acm.org wrote:
Hi,
I'm working on
5.4. Ordered facts
in
file:///C:/x86/Jess71p2/docs/memory.html
with Jess Jess Version 7.1p2 11/5/2008
where there is an example
Jess (number (value 6))
I expected the ordered fact number to get created on-demand but instead
got:
Jess reported an error in routine Funcall.execute
while executing (number (value 6)).
Message: Undefined function number.
Program text: ( number ( value 6 ) ) at line 1.
What am I doing wrong?
Best wishes,
Grant
--
((λ (x) (x x)) (λ (x) (x x)))
http://www.wisdomandwonder.com/
ACM, AMA, COG, IEEE
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