Hi,

Here is the supporting information regarding the problem associated with sscanf.

Octave version 3.0.4

my string variable is "exon":[[[1842,1945]]]

string(11:min(22,11+20))
>> 1842,1945]]]

So I expect delta of value 5 from below statement.

[num, one, err, delta] = sscanf(string(11:min(22,11+20)), '%f', 1);

Hope this will help.

Regards,
Vipin

--------
Bug report for Octave 3.2.3 configured for i686-pc-linux-gnu

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

    I am trying to link the chemical package CANTERA to OCTAVE.
    Cantera supports a MATLAB interface. I compiled the interface
    successfully and tested it by running the cantera_demo script.
    All demos run well, only the demos which contain the 1D Class
    of Cantera fail with the following

    error: concatenation operator not implemented for `struct' by `class' operations
    error: evaluating argument list element number 1
    error: called from:
    error:   /usr/local/cantera/demos/matlab/flame.m at line 46, column 3
    error:   /usr/local/cantera/demos/matlab/flame1.m at line 74, column 4
    error:   /usr/local/cantera/demos/matlab/run_examples.m at line 30, column 1
   
    the function flame is called from flame1 where the simulation problem is set up
    (this "enveloping" code might not be necessary to resolve the error
     but one gets a good idea what's going on)

        % FLAME1 - A burner-stabilized flat flame
        %
        %    This script simulates a burner-stablized lean hydrogen-oxygen flame
        %    at low pressure.

        help flame1;
        %disp('press any key to begin the simulation');
        %pause;

        t0 = cputime;  % record the starting time


        % parameter values
        p          =   0.05*oneatm;         % pressure
        tburner    =   373.0;               % burner temperature
        mdot       =   0.06;                % kg/m^2/s

        rxnmech    =  'h2o2.cti';           % reaction mechanism file
        comp       =  'H2:1.8, O2:1, AR:7'; % premixed gas composition

        initial_grid = [0.0 0.02 0.04 0.06 0.08 0.1 ...
                0.15 0.2 0.4 0.49 0.5];  % m

        tol_ss    = [1.0e-5 1.0e-13];       % [rtol atol] for steady-state
                                                         % problem
        tol_ts    = [1.0e-4 1.0e-9];          % [rtol atol] for time stepping

        loglevel  = 1;                      % amount of diagnostic output (0
                                            % to 5)
                   
        refine_grid = 1;                    % 1 to enable refinement, 0 to
                                           % disable                   
        max_jacobian_age = [5, 10];       
                  
        %%%%%%%%%%%%%%%% create the gas object %%%%%%%%%%%%%%%%%%%%%%%%
        %
        % This object will be used to evaluate all thermodynamic, kinetic    ,
        % and transport properties
        %
        gas = IdealGasMix(rxnmech);

        % set its state to that of the unburned gas at the burner
        set(gas,'T', tburner, 'P', p, 'X', comp);



        %%%%%%%%%%%%%%%% create the flow object %%%%%%%%%%%%%%%%%%%%%%%
   
        f = AxisymmetricFlow(gas,'flow');
        set(f, 'P', p, 'grid', initial_grid);
        set(f, 'tol', tol_ss, 'tol-time', tol_ts);



        %%%%%%%%%%%%%%% create the burner %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        %
        %  The burner is an Inlet object. The temperature, mass flux,
        %  and composition (relative molar) may be specified.
        %
        burner = Inlet('burner');
        set(burner, 'T', tburner, 'MassFlux', mdot, 'X', comp);



        %%%%%%%%%%%%%% create the outlet %%%%%%%%%%%%%%%%%%%%%%%%%%%%
        %
        %  The type of flame is determined by the object that terminates
        %  the domain. An Outlet object imposes zero gradient boundary
        %  conditions for the temperature and mass fractions, and zero
        %  radial velocity and radial pressure gradient.
        %
        s = Outlet('out');


        %%%%%%%%%%%%% create the flame object  %%%%%%%%%%%%
        %
        % Once the component parts have been created, they can be assembled
        % to create the flame object.
        %
        fl = flame(gas, burner, f, s);
       
        ...
   

    Ok, this is the start of Function flame until the error:

        function f = flame(gas, left, flow, right)

        %  FLAME - create a flame object.
        %
        %    gas     --  object representing the gas. This object will be used to
        %                compute all required thermodynamic, kinetic, and transport
        %                properties. The state of this object should be set
        %                to an estimate of the gas state emerging from the
        %                burner before calling StagnationFlame.
        %
        %    left    --  object representing the burner, which must be
        %                created using function Inlet.
        %
        %    flow    --  object representing the flow, created with
        %                function AxisymmetricFlow.
        %
        %    right   --  object representing the surface.function f = flame(gas, left, flow, right)
   
        % Check input parameters
        if nargin ~= 4
              error('wrong number of input arguments.');
        end

        if ~isIdealGas(gas)
              error('gas object must represent an ideal gas mixture.');
        end
        if ~isInlet(left)
              error('burner object of wrong type.');
        end
        if ~isFlow(flow)
              error('flow object of wrong type.');
        end

        flametype = 0;
            if isSurface(right)
          flametype = 1;
            elseif isInlet(right)
          flametype = 3;
        end

        % create the container object
        %the ERROR occurs HERE when the method <at> Stack/Stack.m is called
        f = Stack([left flow right]);
       
    Here is the definition of function s

        function s = Stack(domains)
        %
        % STACK - A one-dimensional 'stack' of domains.
        %
        %    A stack object is a container for one-dimensional domains,
        %    which are instances of class Domain1D. The domains are of two
        %    types - extended domains, and connector domains.
        %

        disp("DEBUG POS 1 - Stack "); disp (domains); pause;

  The error is in the function headline before the disp(" DEBUG ..") I inserted. Obviously it is not possible to merge the 3 objects into 1 implicitly. The author of the code, Dr. Goodwin, did a thorough job to structure it object orientated. Probably the scripts above will not run without the definition if the basic classes, but the code is well documented and it should be possible to get the idea. I posted what I did to link Cantera to Octave on the Google Cantera Usergroup, in case it is necessary. I don't know if this is significant, I had compiled Octave myself and failed to link in some libraries (SparseMatrixes, FFTW, GraphicMagic, qrupdate, qhull).   

Expected Outcome:
------------------------
Matlab compatibility regarding class objects, no error.



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

    The original error can be repeated with a call of the flame1.m example of Cantera.
    I tried to produce also a shorter example without the Cantera package,
    but failed. I am new to both Cantera and Octave.

Fix:
---

    -


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

uname output:     Linux puppypc 2.6.30.5 #1 SMP Tue Sep 1 15:48:26 GMT-8 2009 i686 GNU/Linux
configure opts:  
Fortran compiler: gfortran
FFLAGS:           -O -mieee-fp
FLIBS:            -L/usr/lib/gcc/i486-t2-linux-gnu/4.2.2 -L/usr/lib/gcc/i486-t2-linux-gnu/4.2.2/../../../../i486-t2-linux-gnu/lib -L/usr/lib/gcc/i486-t2-linux-gnu/4.2.2/../../.. -lz -lgfortranbegin -lgfortran -lm
CPPFLAGS:        
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler:       gcc, version 4.2.2
CFLAGS:           -g -O2
CPICFLAG:         -fPIC
C++ compiler:     g++, version 4.2.2
CXXFLAGS:         -g -O2
CXXPICFLAG:       -fPIC
LD_CXX:           g++
LDFLAGS:         
LIBFLAGS:         -L.
RLD_FLAG:         -Wl,-rpath -Wl,/usr/local/lib/octave-3.2.3
BLAS_LIBS:       
FFTW_LIBS:       
LIBS:             -lreadline  -lncurses -ldl -lz -lm
LEXLIB:          
LIBGLOB:         
SED:              /bin/sed
DEFS:

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User-preferences (please do not edit this section):
--------------------------------------------------

  EDITOR = mp
  EXEC_PATH = /usr/local/libexec/octave/3.2.3/site/exec/i686-pc-linux-gnu:/usr/local/libexec/octave/api-v37/site/exec/i686-pc-linux-gnu:/usr/local/libexec/octave/site/exec/i686-pc-linux-gnu:/usr/local/libexec/octave/3.2.3/exec/i686-pc-linux-gnu:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/X11R7/bin:/root/my-applications/bin:/opt/qt4/bin:/opt/mozilla.org/bin:/opt/samba/bin
  IMAGE_PATH = .:/usr/local/share/octave/3.2.3/imagelib
  PAGER = less
  PS1 = >>
  PS2 =
  PS4 = +
  beep_on_error = 1
  completion_append_char = 
  crash_dumps_octave_core = 0
  echo_executing_commands = 0
  fixed_point_format = 1
  gnuplot_binary = gnuplot
# gnuplot_command_end = <no value or error in displaying it>
# gnuplot_command_plot = <no value or error in displaying it>
# gnuplot_command_replot = <no value or error in displaying it>
# gnuplot_command_splot = <no value or error in displaying it>
# gnuplot_command_title = <no value or error in displaying it>
# gnuplot_command_using = <no value or error in displaying it>
# gnuplot_command_with = <no value or error in displaying it>
  history_file = /root/.octave_hist
  history_size = 1024
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  info_file = /usr/local/share/info/octave.info
  info_program = info
  makeinfo_program = makeinfo
  max_recursion_depth = 256
  output_max_field_width = 5
  output_precision = 5
  page_output_immediately = 0
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# print_answer_id_name = <no value or error in displaying it>
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  string_fill_char = 
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  suppress_verbose_help_message = 0

Sorry I was not able to send this from inside the bug_report script,
regards
emil

--

Emil Widmann
Kürsinger Hütte
Obersulzbachtal
5741 Neukirchen am Großvenediger
+43 6565 6450
emil.widmann <at> gmail.com
info <at> kuersinger.at