Info Catalog octave: Cell Arrays octave: Creating Cell Arrays

octave: Basic Usage of Cell Arrays

 
 6.2.1 Basic Usage of Cell Arrays
 --------------------------------
 
 As an example, the following code creates a cell array containing a
 string and a 2-by-2 random matrix
 
      c = {"a string", rand(2, 2)};
 
 To access the elements of a cell array, it can be indexed with the { and
 } operators.  Thus, the variable created in the previous example can be
 indexed like this:
 
      c{1}
           ⇒ ans = a string
 
 As with numerical arrays several elements of a cell array can be
 extracted by indexing with a vector of indexes
 
      c{1:2}
           ⇒ ans = a string
           ⇒ ans =
 
                     0.593993   0.627732
                     0.377037   0.033643
 
    The indexing operators can also be used to insert or overwrite
 elements of a cell array.  The following code inserts the scalar 3 on
 the third place of the previously created cell array
 
      c{3} = 3
           ⇒ c =
 
               {
                 [1,1] = a string
                 [1,2] =
 
                    0.593993   0.627732
                    0.377037   0.033643
 
                 [1,3] =  3
               }
 
    Details on indexing cell arrays are explained in Indexing Cell
 Arrays.
 
    In general nested cell arrays are displayed hierarchically as in the
 previous example.  In some circumstances it makes sense to reference
 them by their index, and this can be performed by the ‘celldisp’
 function.
 
  -- : celldisp (C)
  -- : celldisp (C, NAME)
      Recursively display the contents of a cell array.
 
      By default the values are displayed with the name of the variable
      C.  However, this name can be replaced with the variable NAME.  For
      example:
 
           c = {1, 2, {31, 32}};
           celldisp (c, "b")
              ⇒
                 b{1} =
                  1
                 b{2} =
                  2
                 b{3}{1} =
                  31
                 b{3}{2} =
                  32
 
      See also: disp XREFdisp.
 
    To test if an object is a cell array, use the ‘iscell’ function.  For
 example:
 
      iscell (c)
           ⇒ ans = 1
 
      iscell (3)
           ⇒ ans = 0
 
 
  -- : iscell (X)
      Return true if X is a cell array object.
 
DONTPRINTYET       See also: ismatrix XREFismatrix, *noteisstruct:
DONTPRINTYET       See also: ismatrix XREFismatrix, isstruct

      XREFisstruct, iscellstr XREFiscellstr, isa XREFisa.
 

Info Catalog octave: Cell Arrays octave: Creating Cell Arrays