Since sh:equals is based on RDF node equality, values such as
"1.0"^^xsd:float and "1"^^xsd:float count as distinct. Maybe that's the
issue you are running into?
SPARQL does comparison by (mathematical) values, so 1.0 = 1 there.
Holger
On 17/08/2020 14:36, Chavdar Ivanov wrote:
Dear Holger,
Thanks. I will approach the other forum.
Just to clarify – yes all literals were typed literals with datatype
float. So sh:equals was comparing float to float
Did you mean that I should use xsd:decimal in the SPARQL query
although in data graph it is coming as float?
Something like this
?var1 which is float in data graph
?var2 which is float in data graph
xsd:decimal(?var1)!=xsd:decimal(?var2)
Best regards
Chavdar
В 2:13:30 UTC+2на понеделник, 17 август 2020 г. Holger Knublauch написа:
On 11/08/2020 06:17, Chavdar Ivanov wrote:
Dear all,
I have a very basic question...
I need to compare literals that are floats and tried to use two
ways. 1) using sh:equals to compare 2 properties and 2) using
SPARQL where I filter != different values
For the filter I tried using
FILTER (xsd:float(?value1)!=xsd:float(?value1)).
or
FILTER (?value1!=?value1).
Both give the same outcome.
Below I listed a summary of the tests I did
I think sh:equals treats the literals as strings even though they
are floats. It also gives 2 results. I thing this looks like
according to the SHACL spec although I didn't if the sh:equals
ignores the datatype.
sh:equals will compare the RDF nodes, so the datatype will make a
big difference and "1"^^xsd:float will be different from
"1"^^xsd:string or integer.
However In some cases the result form the SPARQL is kind of
strange. It looks like the precision is 10-6, but for the big
numbers and when scientific form on float number is used we have
something different.
What is followed to define the difference?
If I use google calculator
100123456.1-100.123459E+06=-2.90000000596
Normally it should be OK to compare different forms of float.
1) using sh:equals in the property shape
Value1 ; value 2 ; comparisson result
1.123456 ; 1.123456 ; same
1.1234560 ; 1.1234561 ; different (sh:equals reports it twice)
31.1234560 ; 31.1234561 ;different (sh:equals reports it twice)
30 ; 30.0000001 ; different (sh:equals reports it twice)
30 ; 30.000001 ; different (sh:equals reports it twice)
100123456.0 ; 100123456.1 ; different (sh:equals reports it twice)
100123456.0 ; 100123456.0 ; same
100123456 ; 100.123456E6 ; different (sh:equals reports it twice)
100123456 ; 100.123456E+06 ; different (sh:equals reports it
twice)
-0.123456789 ; -123.456789E-3 ; different (sh:equals reports it
twice)
-0.123456789 ; -123.456789E-03 ; different (sh:equals reports
it twice)
100123456.1 ; 100.123456E+06 ; different (sh:equals reports
it twice)
100123456.1 ; 100.123459E+06 ; different (sh:equals reports
it twice)
100123456.1 ; 100123459 ; different (sh:equals reports
it twice)
100123456.1 ; 100123459.0 ; different (sh:equals reports
it twice)
2) using SPARQL (in the property shape)
1.123456 ; 1.123456 ; same
1.1234560 ; 1.1234561 ; different
31.1234560 ; 31.1234561 ;different
30 ; 30.0000001 ; same
30 ; 30.000001 ; different
100123456.0 ; 100123456.1 ; same
100123456.0 ; 100123456.0 ; same
100123456 ; 100.123456E6 ; same
100123456 ; 100.123456E+06 ; same
-0.123456789 ; -123.456789E-3 ; same
-0.123456789 ; -123.456789E-03 ; same
100123456.1 ; 100.123456E+06 ; same
100123456.1 ; 100.123459E+06 ; same
100123456.1 ; 100123459 ; same
100123456.1 ; 100123459.0 ; same
In SPARQL you may be better off with xsd:decimal than xsd:float,
as xsd:decimal has more precision. But this is more of a
SPARQL/ARQ question for which you may get more qualified help
elsewhere, e.g. on jena-users.
Holger
Best regards
Chavdar
--
You received this message because you are subscribed to the
Google Groups "TopBraid Suite Users" group.
To unsubscribe from this group and stop receiving emails from it,
send an email to topbraid-user...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/topbraid-users/63a7e8ba-468e-4803-a1c4-31afca5d55e9n%40googlegroups.com
<https://groups.google.com/d/msgid/topbraid-users/63a7e8ba-468e-4803-a1c4-31afca5d55e9n%40googlegroups.com?utm_medium=email&utm_source=footer>.
--
You received this message because you are subscribed to the Google
Groups "TopBraid Suite Users" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to topbraid-users+unsubscr...@googlegroups.com
<mailto:topbraid-users+unsubscr...@googlegroups.com>.
To view this discussion on the web visit
https://groups.google.com/d/msgid/topbraid-users/3c8ac02a-8d85-4657-b3b1-33c603447b2fn%40googlegroups.com
<https://groups.google.com/d/msgid/topbraid-users/3c8ac02a-8d85-4657-b3b1-33c603447b2fn%40googlegroups.com?utm_medium=email&utm_source=footer>.
--
You received this message because you are subscribed to the Google Groups "TopBraid
Suite Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to topbraid-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/topbraid-users/08f4198a-5d85-43c0-535c-d0b731a141ef%40topquadrant.com.
