From help-request at octave dot org Thu Dec 29 07:02:46 2005
Subject: wrong size for empty structure array
From: Michael Schmid <michaelschmid1 at bluewin dot ch>
To: help at octave dot org
Date: Thu, 29 Dec 2005 13:58:18 +0100

second try to describe the problem

1. again Matlabs behaviour:
===================

a = struct;
size(a)
ans = 1  1            more informations: Size: 1x1  Bytes: 0  Class: 
struct array

a = struct('sub1',[],'sub2^,[])
size(a)
ans = 1  1           more informations: Size 1x1  Bytes: 248 Class: 
struct array
a(1)
ans =
    sub1: []
    sub2: []

a(1) = []
a =

1x0 struct array with fields:
    sub1
    sub2
size(a)
ans = 1   0

the same tests in Octave:
=================

a = struct;
size(a)
ans = 1  1            more informations: Size: 1x1  Bytes: 0  Class: struct
**** comment: more or less the same **************

a = struct('sub1',[],'sub2^,[])
size(a)
ans = 1  1           more informations: Size 1x1
octave:14> a(1)
ans =
{
  sub1 = [](0x0)
  sub2 = [](0x0)
}
********comment, seems to be the same *************

octave:15> a(1)=[]
error: octave_base_value::map_value(): wrong type argument `matrix'
error: invalid structure assignment
error: assignment failed, or no method for `struct = matrix'
error: evaluating assignment expression near line 15, column 5
octave:15>
************** so it isn't possible to get an empty structure with the same
size like above from Matlab.... ***********************************
is this a bug or not??

thanks for any help again..

Michael



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