sum of numeric column

I have a table structure and want to do a sum of column type i.e numeric.
How can I do it ? when i try sum function i get this error

ERROR: function sum(numeric[]) does not exist

Can anyone please help me with this ?

Column | Type | Collation |
Nullable | Default
----------------------------+--------------------------+-----------+----------+---------
grid_id | bigint | | not
null |
as_of_date | date | | not
null |
cell_id | bigint | | not
null |
last_event_timestamp_local | timestamp with time zone | |
|
last_event_id | bigint | |
|
column_id | bigint | |
|
column_name | character varying(50) | |
|
row_id | bigint | |
|
data_type_id | smallint | |
|
data_numeric | numeric[] | |
|
data_string | character varying[] | |
|

e.g. of values in numeric type column

data_numeric
--------------
{2.0}
{1.0}

Regards
Prabhjot