Assign Cell to octave map: error

Alexander Rusakov alexander.rusakov at googlemail.com
Thu Mar 12 15:12:18 CDT 2009


Bug report for Octave 3.0.3 configured for i686-pc-linux-gnu

Description:
-----------

I believe that I found a bug in Octave c++ API. The problem that it is not
possible  to assign arbitrary cell to an octave_map because of error from
octave API.  This happens if:
1) Octave_map already has got some data
2) The size of Cell != 1.

I guess that line 461 in oct_map.cc file contains a bug. Probably the whole
function has got some bug because I can not understand why there is  a need
of comparison of dimension of octave_map and Cell which is only an element
in map.

00448 Octave_map&
00449 Octave_map::assign (const std::string& k, const Cell& rhs)
00450 {
00451   if (nfields () == 0)
00452     {
00453       maybe_add_to_key_list (k);
00454
00455       map[k] = rhs;
00456
00457       dimensions = rhs.dims ();
00458     }
00459   else
00460     {
00461       if (dims () == rhs.dims ())
00462         {
00463           maybe_add_to_key_list (k);
00464
00465           map[k] = rhs;
00466         }
00467       else
00468         error ("invalid structure assignment");
00469     }
00470


Repeat-By:
---------

My problem that this code does not work:

 //This does not work as I expect
 Octave_map omap;
 cout << " Adding cell arrays to one maps \n";
{
  // I am trying to create 1d cell array of size 1
   dim_vector dv(1);
   Cell oc(dv);
   cout << "Trying to add cell array of size " << dv(0) << " is added to
octave_map" << endl;
   omap.assign("cell1", oc);
   cout << "cell array of size " << dv(0) << " is added to octave_map" <<
endl;
 }

 {
  // I am trying to create 1d cell array of size 2
  dim_vector dv(1);
  dv(0) = 2;
  Cell oc(dv);
  cout << "Trying to add cell array of size " << dv(0) << " is added to
octave_map" << endl;
 / /Here I get an error message  "error: invalid structure assignment"
  omap.assign("cell2", oc);
  cout << "cell array of size " << dv(0) << " is added to octave_map" <<
endl;
 }

So the produced output is :

Trying to add cell array of size 1 is added to octave_map
cell array of size 1 is added to octave_map
Trying to add cell array of size 2 is added to octave_map
error: invalid structure assignment             <-------------------
Octave message
cell array of size 2 is added to octave_map


I am also sending a simple example which demonstrates the problem, and when
it happens. To compile:

mkoctfile TestOctaveCellMap.cpp
To execute:
octave --eval "TestOctaveCellMap"



Fix:
---

 I guess that assertion in oct_map.cc on line 461 must be removed. Probably
extra changes are required.


Configuration (please do not edit this section):
-----------------------------------------------

uname output:     Linux copernicus 2.6.22.14-72.fc6 #1 SMP Wed Nov 21
15:12:59 \
EST 2007 i686 i686 i386 GNU/Linux
configure opts:   'CFLAGS=-g -O0' 'CXXFLAGS=-g -O0' 'FFLAGS=-g -O0'
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home/rusakov/OCTAVEDBG'
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CPICFLAG:         -fPIC
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Thanks and Best Regards,
Alexander Rusakov
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