[Octave-bug-tracker] [bug #30893] possible bug : max does not retain the boolean type

[Pierre Bellec]

URL:
  <http://savannah.gnu.org/bugs/?30893>

                 Summary: possible bug : max does not retain the boolean type
                 Project: GNU Octave
            Submitted by: pbellec
            Submitted on: ven 27 aoû 2010 21:19:43 GMT
                Category: None
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: GNU/Linux

    _______________________________________________________

Details:

Bug report for Octave 3.2.3 configured for x86_64-pc-linux-gnu

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

max sometimes does not retain the data type of the entry, and more precisely
max applied on a boolean array will result into a double array. Whether that
is a bug or not is not clear though, because max([true false]) does not make
much sense, and the 1/0 convention for true/false is sort of arbitrary. The
thing is, there is no equivalent to max that is specific to operations on
boolean as far as I know. And max do accept boolean inputs, so it should deal
reasonably with them. Also, Matlab does retain the boolean type for the
output.

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

>> A = [true false];
>> B = max(A);
>> whos B
Variables in the current scope:

  Attr Name        Size                     Bytes  Class
  ==== ====        ====                     =====  ===== 
       B           1x1                          8  double

Total is 1 element using 8 bytes


Fix:
---

max is an oct file, and I haven't yet dived into that, so I din't come up
with a patch for the problem. 


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

uname output:     Linux peuplier 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11
08:03:28 UTC 2010 x86_64 GNU/Linux
configure opts:   '--build=x86_64-linux-gnu' '--prefix=/usr'
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'--with-lapack=-llapackgf-3' '--with-hdf5' '--with-fftw' '--enable-shared'
'--enable-rpath' '--disable-static' 'build_alias=x86_64-linux-gnu' 'CC=gcc'
'CFLAGS=-g -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' 'CXX=g++'
'CXXFLAGS=-g -O2' 'F77=gfortran' 'FFLAGS=-g -O2'
Fortran compiler: gfortran
FFLAGS:           -O2 -g
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CPPFLAGS:         
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler:       gcc, version 4.4.3 (Ubuntu 4.4.3-3ubuntu1) 
CFLAGS:           -O2 -g
CPICFLAG:         -fPIC
C++ compiler:     g++, version 4.4.3
CXXFLAGS:         -O2 -g
CXXPICFLAG:       -fPIC
LD_CXX:           g++
LDFLAGS:          -Wl,-Bsymbolic-functions
LIBFLAGS:         -L.
RLD_FLAG:         -Wl,-rpath -Wl,/usr/lib/octave-3.2.3
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--------------------------------------------------

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