Shane wrote:

>Hi,
>
>I am attempting a query using lseg values to find the point
>of intersection. The following query taken from the PG
>manual isn't working over here.
>
>select
>point(lseg '((-1,0),(1,0))', lseg
>'((-2,-2),(2,2))')
>ERROR: function point(lseg, lseg) does not exist
>HINT: No function matches the given name and argument
>types. You may need to add explicit type casts.
>
>Do I need to declare this function somewhere? Pg version
>7.4.7 (debian rev 6 Sarge).
>
>Best regards,
>Shane
>
>
>

Shane,

The operator for determining the intersection of two lsegs is #; thus,

select lseg # lseg

and the result is the intersection point.

Don

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