title: Insert DBGrid data into a multi-dimensional array
body: <p>I have set a connection from Delphi to pgsql using ADOConnection, ADOQuery, DataSource and a DBGrid to present the results of my query. 
  The database contains 2 columns of values of type <em>double</em>, of some thousands of rows, which I would like to insert into a two-dimensional array.However, as am quite new I am not sure how to insert the contents of a DBGrid into an array. Any help much appreciated.</p>