Rounding Float Array

On 21/09/15 11:55, Alex Magnum wrote:

Hello,

I have a float array holding geo location information.

geoloc
-----------------------------------
{5.3443133704554,100.29457569122}
{5.3885574294704,100.29601335526}
{3.1654978750403,101.60915851593}
{5.3766154817748,100.31472444534}
{3.1545014704258,101.70036971569}
(5 rows)

Is there an easy way to round all values to 4 decimals.

I can round the individual values and return them seperately but I need to return them as an array.

lat | long
---------+-----------
5.34431 | 100.29458
5.38856 | 100.29601
3.16550 | 101.60916
5.37662 | 100.31472
3.15450 | 101.70037
(5 rows)

Any suggestion is highly appreciated.

This might work for you.

Bye,
Chris.

chris=# select * from geoloc;
geoloc
-----------------------------------
{5.3443133704554,100.29457569122}
{5.3885574294704,100.29601335526}
{3.1654978750403,101.60915851593}
{5.3766154817748,100.31472444534}
{3.1545014704258,101.70036971569}
(5 rows)

chris=# select (select array_agg(to_char(x, '999.9999')::float) from unnest(geoloc) as x) from geoloc;;
array_agg
-------------------
{5.3443,100.2946}
{5.3886,100.296}
{3.1655,101.6092}
{5.3766,100.3147}
{3.1545,101.7004}
(5 rows)

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Alex Magnum <magnum11200@gmail.com> wrote:

Hello,

I have a float array holding geo location information.

� � � � � � � geoloc
-----------------------------------
�{5.3443133704554,100.29457569122}
�{5.3885574294704,100.29601335526}
�{3.1654978750403,101.60915851593}
�{5.3766154817748,100.31472444534}
�{3.1545014704258,101.70036971569}
(5 rows)

Is there an easy way to round all values to 4 decimals.

sure:

test=*# select * from alex ;
geoloc
-----------------------------------
{5.3443133704554,100.29457569122}
{5.3885574294704,100.29601335526}
{3.1654978750403,101.60915851593}
{5.3766154817748,100.31472444534}
(4 rows)

Time: 0,245 ms
test=*# update alex set geoloc = array[round(geoloc[1]::numeric,4),
round(geoloc[2]::numeric,4)];
UPDATE 4
Time: 0,454 ms
test=*# select * from alex ;
geoloc
-------------------
{5.3443,100.2946}
{5.3886,100.296}
{3.1655,101.6092}
{5.3766,100.3147}
(4 rows)

Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknown)
Kaufbach, Saxony, Germany, Europe. N 51.05082�, E 13.56889�

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On Mon, Sep 21, 2015 at 11:55:23AM +0200, Alex Magnum wrote:

Hello,

I have a float array holding geo location information.

geoloc
-----------------------------------
{5.3443133704554,100.29457569122}
{5.3885574294704,100.29601335526}
{3.1654978750403,101.60915851593}
{5.3766154817748,100.31472444534}
{3.1545014704258,101.70036971569}
(5 rows)
Is there an easy way to round all values to 4 decimals.

Sure:
$ select geoloc from alex;
geoloc
-----------------------------------
{5.3443133704554,100.29457569122}
{5.3885574294704,100.29601335526}
{3.1654978750403,101.60915851593}
{5.3766154817748,100.31472444534}
{3.1545014704258,101.70036971569}
(5 rows)

(depesz@[local]:5960) 12:15:46 [depesz]
$ select geoloc::numeric(8,4)[] from alex;
geoloc
-------------------
{5.3443,100.2946}
{5.3886,100.2960}
{3.1655,101.6092}
{5.3766,100.3147}
{3.1545,101.7004}
(5 rows)

depesz

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hubert depesz lubaczewski <depesz@depesz.com> wrote:

Is there an easy way to round all values to 4 decimals.

Sure:

(depesz@[local]:5960) 12:15:46 [depesz]
$ select geoloc::numeric(8,4)[] from alex;
geoloc
-------------------
{5.3443,100.2946}

Nice!

Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknown)
Kaufbach, Saxony, Germany, Europe. N 51.05082�, E 13.56889�

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Sure:

(depesz@[local]:5960) 12:15:46 [depesz]
$ select geoloc::numeric(8,4)[] from alex;
geoloc
-------------------
{5.3443,100.2946}

Nice!

Indeed :)

Bye,
Chris.

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