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dimensions

dimensions

Owned by Jason Kinchen
Feb 16, 2021

 The dimensions operator lists array dimensions.

Synopsis

dimensions(named_array);

Summary

The argument to the dimensions operator is the name of an array. It returns an array with one row per dimension, and the following attributes for each dimension:

  • name
  • start index
  • length
  • chunk size
  • chunk overlap
  • low boundary index
  • high boundary index
  • data type

 The argument named_array must be a previously-created and stored array in SciDB.

Example

To create an array with three dimensions, do the following:

AFL% CREATE ARRAY array1 <val:double>[i=0:1999:0:100; j=1:10:2; k=-20:20];

Dimension i has chunk overlap of zero and chunk size of 100.  Dimension j has an overlap of two, and the chunk size is left unspecified.  Dimension k specifies neither chunk overlap nor chunk size.

AFL% dimensions(array1);  


The output is:

{No} name,start,length,chunk_interval,chunk_overlap,low,high,type
{0} 'i',0,2000,100,0,4611686018427387903,-4611686018427387903,'int64'
{1} 'j',1,10,-1,2,4611686018427387903,-4611686018427387903,'int64'
{2} 'k',-20,41,-1,0,4611686018427387903,-4611686018427387903,'int64'

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