GNU Octave Manual Version 3 by John W. Eaton, David Bateman, Søren Hauberg Paperback (6"x9"), 568 pages ISBN 095461206X RRP £24.95 ($39.95) Get a printed copy>>>

GNU Octave Manual Version 3 Buy the book here >>> support free documentation

6.1.3 Manipulating Structures

Other functions that can manipulate the fields of a structure are given below.

Built-in Function: fieldnames (struct)

Return a cell array of strings naming the elements of the structure struct. It is an error to call fieldnames with an argument that is not a structure.

Built-in Function: isfield (expr, name)

Return true if the expression expr is a structure and it includes an element named name. The first argument must be a structure and the second must be a string.

Function File: [v1, ...] = getfield (s, key, ...)

Extract fields from a structure. For example

ss(1,2).fd(3).b=5;
getfield (ss, {1,2}, "fd", {3}, "b")
=> ans = 5

Note that the function call in the previous example is equivalent to the expression

i1= {1,2}; i2= "fd"; i3= {3}; i4= "b";
ss(i1{:}).(i2)(i3{:}).(i4)

See also setfield, rmfield, isfield, isstruct, fieldnames, struct

Function File: substruct (type, subs, ...)

Create a subscript structure for use with subsref or subsasgn.

See also subsref, subsasgn