diff options
Diffstat (limited to 'doc/src/sgml/seg.sgml')
| -rw-r--r-- | doc/src/sgml/seg.sgml | 60 |
1 files changed, 30 insertions, 30 deletions
diff --git a/doc/src/sgml/seg.sgml b/doc/src/sgml/seg.sgml index abce2598ef..b37939e488 100644 --- a/doc/src/sgml/seg.sgml +++ b/doc/src/sgml/seg.sgml @@ -72,7 +72,7 @@ test=> select '6.25 .. 6.50'::seg as "pH"; <para> The external representation of an interval is formed using one or two floating point numbers joined by the range operator ('..' or '...'). - Optional certainty indicators (<, > and ~) are ignored by the internal + Optional certainty indicators (<, > and ~) are ignored by the internal logics, but are retained in the data. </para> @@ -82,35 +82,35 @@ test=> select '6.25 .. 6.50'::seg as "pH"; <tbody> <row> <entry>rule 1</entry> - <entry>seg -> boundary PLUMIN deviation</entry> + <entry>seg -> boundary PLUMIN deviation</entry> </row> <row> <entry>rule 2</entry> - <entry>seg -> boundary RANGE boundary</entry> + <entry>seg -> boundary RANGE boundary</entry> </row> <row> <entry>rule 3</entry> - <entry>seg -> boundary RANGE</entry> + <entry>seg -> boundary RANGE</entry> </row> <row> <entry>rule 4</entry> - <entry>seg -> RANGE boundary</entry> + <entry>seg -> RANGE boundary</entry> </row> <row> <entry>rule 5</entry> - <entry>seg -> boundary</entry> + <entry>seg -> boundary</entry> </row> <row> <entry>rule 6</entry> - <entry>boundary -> FLOAT</entry> + <entry>boundary -> FLOAT</entry> </row> <row> <entry>rule 7</entry> - <entry>boundary -> EXTENSION FLOAT</entry> + <entry>boundary -> EXTENSION FLOAT</entry> </row> <row> <entry>rule 8</entry> - <entry>deviation -> FLOAT</entry> + <entry>deviation -> FLOAT</entry> </row> </tbody> </tgroup> @@ -142,7 +142,7 @@ test=> select '6.25 .. 6.50'::seg as "pH"; </row> <row> <entry>EXTENSION</entry> - <entry>[<>~]</entry> + <entry>[<>~]</entry> </row> </tbody> </tgroup> @@ -169,16 +169,16 @@ test=> select '6.25 .. 6.50'::seg as "pH"; </entry> </row> <row> - <entry><5.0</entry> + <entry><5.0</entry> <entry> - (rules 5,7) -- creates a point at 5.0; '<' is ignored but + (rules 5,7) -- creates a point at 5.0; '<' is ignored but is preserved as a comment </entry> </row> <row> - <entry>>5.0</entry> + <entry>>5.0</entry> <entry> - (rules 5,7) -- creates a point at 5.0; '>' is ignored but + (rules 5,7) -- creates a point at 5.0; '>' is ignored but is preserved as a comment </entry> </row> @@ -305,39 +305,39 @@ postgres=> select '10(+-)1'::seg as seg; <itemizedlist> <listitem> <programlisting> -[a, b] << [c, d] Is left of +[a, b] << [c, d] Is left of </programlisting> <para> The left operand, [a, b], occurs entirely to the left of the right operand, [c, d], on the axis (-inf, inf). It means, - [a, b] << [c, d] is true if b < c and false otherwise + [a, b] << [c, d] is true if b < c and false otherwise </para> </listitem> <listitem> <programlisting> -[a, b] >> [c, d] Is right of +[a, b] >> [c, d] Is right of </programlisting> <para> [a, b] is occurs entirely to the right of [c, d]. - [a, b] >> [c, d] is true if a > d and false otherwise + [a, b] >> [c, d] is true if a > d and false otherwise </para> </listitem> <listitem> <programlisting> -[a, b] &< [c, d] Overlaps or is left of +[a, b] &< [c, d] Overlaps or is left of </programlisting> <para> This might be better read as "does not extend to right of". - It is true when b <= d. + It is true when b <= d. </para> </listitem> <listitem> <programlisting> -[a, b] &> [c, d] Overlaps or is right of +[a, b] &> [c, d] Overlaps or is right of </programlisting> <para> This might be better read as "does not extend to left of". - It is true when a >= c. + It is true when a >= c. </para> </listitem> <listitem> @@ -351,7 +351,7 @@ postgres=> select '10(+-)1'::seg as seg; </listitem> <listitem> <programlisting> -[a, b] && [c, d] Overlaps +[a, b] && [c, d] Overlaps </programlisting> <para> The segments [a, b] and [c, d] overlap. @@ -359,25 +359,25 @@ postgres=> select '10(+-)1'::seg as seg; </listitem> <listitem> <programlisting> -[a, b] @> [c, d] Contains +[a, b] @> [c, d] Contains </programlisting> <para> The segment [a, b] contains the segment [c, d], that is, - a <= c and b >= d + a <= c and b >= d </para> </listitem> <listitem> <programlisting> -[a, b] <@ [c, d] Contained in +[a, b] <@ [c, d] Contained in </programlisting> <para> The segment [a, b] is contained in [c, d], that is, - a >= c and b <= d + a >= c and b <= d </para> </listitem> </itemizedlist> <para> - (Before PostgreSQL 8.2, the containment operators @> and <@ were + (Before PostgreSQL 8.2, the containment operators @> and <@ were respectively called @ and ~. These names are still available, but are deprecated and will eventually be retired. Notice that the old names are reversed from the convention formerly followed by the core geometric @@ -393,8 +393,8 @@ postgres=> select '10(+-)1'::seg as seg; </para> <programlisting> -[a, b] < [c, d] Less than -[a, b] > [c, d] Greater than +[a, b] < [c, d] Less than +[a, b] > [c, d] Greater than </programlisting> <para> These operators do not make a lot of sense for any practical |