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GNU Octave Manual Version 3
by John W. Eaton, David Bateman, Søren Hauberg
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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

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";

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

ISBN 095461206XGNU Octave Manual Version 3See the print edition