Getting X coordinate from a point(lseg), btw i read the man page about points.

Hi in the main page about geometric operations said:

It is possible to access the two component numbers of a point as though it were an array with indices 0 and 1. For example, if t.p is a point column then SELECT p[0] FROM t retrieves the X coordinate and UPDATE t SET p[1] = ... changes the Y coordinate. In the same way, a value of type box or lseg can be treated as an array of two point values.

1st. i have a field

Column | Type | Modifiers
-----------+-----------------------+-------------------------------
id | integer | not null
info | lseg |

After read the above, i tried to

select info from table limit 1;

info

----------------------------------------------------

[(647753.125,2825633.75),(647738.8125,2825626.75)]

the value i want to get is:647753.125

so i tried to do:

select info[0] from table limit 1;

info

-------------------------

(647753.125,2825633.75)

i still want to get647753.125, so i did:

select info[0][0] from table limit 1;

info

------

(1 row)

But, nothing appears like a NULL.

then i did:

select point(info[0])[0] from table limit 1;

ERROR: syntax error at or near "["

LINE 1: select point(info[0])[0] from table limit 1;

and finally i wrote this mail :-)

Regards.
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