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C++ API

Built-in Function: subsref (val, idx)

Perform the subscripted element selection operation according to the subscript specified by idx.

The subscript idx is expected to be a structure array with fields ‘type’ and ‘subs’. Valid values for ‘type’ are ‘"()"’, ‘"{}"’, and ‘"."’. The ‘subs’ field may be either ‘":"’ or a cell array of index values.

The following example shows how to extract the first two columns of a matrix 

val = magic (3)
   ⇒ val = [ 8   1   6
              3   5   7
              4   9   2 ]
idx.type = "()";
idx.subs = {":", 1:2};
subsref (val, idx)
    ⇒ [ 8   1
         3   5
         4   9 ]

Note that this is the same as writing val(:,1:2).

If idx is an empty structure array with fields ‘type’ and ‘subs’, return val.

See also: subsasgn, substruct.

Package: octave