Minus zero in Dataset

Hdf-forum archives
1

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

···

--

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
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Tel.: +351 21 8419425
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2

Hi,

0 can be represented as 0.0 and -0.0 in floating point representation. Your
actual data has both, that's all. It doesn't matter.

Cheers,

Matthieu

···

2014-02-21 12:22 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt>:

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with
HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

--

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

3

Some floating point representations have both a negative and positive 0.

Possibly you are storing both negative and positive zeros into the file,
and this is what is being reflected in HDFView.

···

On Fri, 21 Feb 2014, Eduardo Jauch wrote:

I'm generating some HDF files and in many datasets, when I open with
HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

--

4

Hola! :slight_smile:

  Could it be -1E-12 which is rounded by10 digits to -0.0 or something like that?

    Werner

···

On 21.02.2014 13:22, Eduardo Jauch wrote:

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

--
  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL:www.mohid.com
         <www.ist.utl.pt>
<www.mohid.com>

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org
http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
___________________________________________________________________________
Dr. Werner Benger Visualization Research
Center for Computation & Technology at Louisiana State University (CCT/LSU)
2019 Digital Media Center, Baton Rouge, Louisiana 70803
Tel.: +1 225 578 4809 Fax.: +1 225 578-5362

5

Hi :slight_smile:

I think not. The values are always zero or positive. No negative values are being stored in the file.

Eduardo.

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com
         
<www.ist.utl.pt>
<www.mohid.com>

···

Em 21-02-2014 12:34, Werner Benger escreveu:

Hola! :slight_smile:

Could it be -1E-12 which is rounded by10 digits to -0.0 or something like that?

   Werner

On 21.02.2014 13:22, Eduardo Jauch wrote:

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

--
  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL:www.mohid.com
         <www.ist.utl.pt>
<www.mohid.com>

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org
http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
___________________________________________________________________________
Dr. Werner Benger Visualization Research
Center for Computation & Technology at Louisiana State University (CCT/LSU)
2019 Digital Media Center, Baton Rouge, Louisiana 70803
Tel.: +1 225 578 4809 Fax.: +1 225 578-5362

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org
http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

6

Hello Matthieu,

The problem is that if I set the values of an array to 0.0, how is it possible that it to be interpreted as -0.0?
And unfortunatelly, it seems it matter. The code that uses this data works if compiled to 64 bits, but fails if compiled to 32 bits...

Cheers,
Eduardo.

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com
         
<www.ist.utl.pt>
<www.mohid.com>

···

Em 21-02-2014 12:37, Matthieu Brucher escreveu:

Hi,

0 can be represented as 0.0 and -0.0 in floating point representation. Your actual data has both, that's all. It doesn't matter.

Cheers,

Matthieu

2014-02-21 12:22 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>>:

    Hello :slight_smile:

    I'm generating some HDF files and in many datasets, when I open
    with HDFView, some of the values are set to -0.0, but they should
    be 0.0.

    Anyone found this already?

    Some hint on what can be?

    Best regards,
    Eduardo Jauch

    --

          TECNICO Lisboa - MARETEC
    Sec��o de Ambiente e Energia

    Av. Rovisco Pais
    1049-001 Lisboa

    Tel.:+351 21 8419425 <tel:%2B351%2021%208419425>
    Fax:+351 21 8417365 <tel:%2B351%2021%208417365>

    URL:www.mohid.com <http://www.mohid.com>
             
    <http://www.ist.utl.pt>
    <http://www.mohid.com>

    _______________________________________________
    Hdf-forum is for HDF software users discussion.
    Hdf-forum@lists.hdfgroup.org <mailto:Hdf-forum@lists.hdfgroup.org>
    http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org
http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

7

Hum...

I'm pretty sure that I'm not storing any "negative" zero in the file.
At least, it shouldn't, once the values are being provided by the user (me) and I'm providing only positive zeros (0.0).

I'll investigate more to see if there is something wrong in the code.

Thanks,
Eduardo

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com
         
<www.ist.utl.pt>
<www.mohid.com>

···

Em 21-02-2014 12:41, Ben Clifford escreveu:

On Fri, 21 Feb 2014, Eduardo Jauch wrote:

I'm generating some HDF files and in many datasets, when I open with
HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Some floating point representations have both a negative and positive 0.

Possibly you are storing both negative and positive zeros into the file,
and this is what is being reflected in HDFView.

8

If your code fails with those values, then something is definitely wrong in
your code. 0.0 and -0.0 behaves the same in floating point computations.
You can check the binary representation of the data, just to check that it
really is 0, and not some other small negative value.

Cheers,

Matthieu

···

2014-02-21 13:16 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt>:

Hello Matthieu,

The problem is that if I set the values of an array to 0.0, how is it
possible that it to be interpreted as -0.0?
And unfortunatelly, it seems it matter. The code that uses this data works
if compiled to 64 bits, but fails if compiled to 32 bits...

Cheers,
Eduardo.

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>
Em 21-02-2014 12:37, Matthieu Brucher escreveu:

Hi,

0 can be represented as 0.0 and -0.0 in floating point representation.
Your actual data has both, that's all. It doesn't matter.

Cheers,

Matthieu

2014-02-21 12:22 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt>:

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with
HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

--

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

_______________________________________________
Hdf-forum is for HDF software users discussion.Hdf-forum@lists.hdfgroup.orghttp://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

9

Hello Matthieu,

I think you're right.

After inspecting the code, it fails not because of the -0.0, but because of a problem associated with an "access violation", and HDF's with only "positive" zeroes also causes the program to crash-

Strangely the error happens only when I read HDF's in 32 bit compiled programs.
But there is a lot o things that can be causing this.

But most probably is something associated with compilation options or exxternal libraries used. The code used to work in 32 bits and recently we changed the compiler.

I'll update it (the compiler) and see if it fix this issue with the 32 bit version.

Thanks!
Eduardo

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com
         
<www.ist.utl.pt>
<www.mohid.com>

···

Em 21-02-2014 13:24, Matthieu Brucher escreveu:

If your code fails with those values, then something is definitely wrong in your code. 0.0 and -0.0 behaves the same in floating point computations.
You can check the binary representation of the data, just to check that it really is 0, and not some other small negative value.

Cheers,

Matthieu

2014-02-21 13:16 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>>:

    Hello Matthieu,

    The problem is that if I set the values of an array to 0.0, how is
    it possible that it to be interpreted as -0.0?
    And unfortunatelly, it seems it matter. The code that uses this
    data works if compiled to 64 bits, but fails if compiled to 32 bits...

    Cheers,
    Eduardo.

          TECNICO Lisboa - MARETEC
    Sec��o de Ambiente e Energia

    Av. Rovisco Pais
    1049-001 Lisboa

    Tel.:+351 21 8419425 <tel:%2B351%2021%208419425>
    Fax:+351 21 8417365 <tel:%2B351%2021%208417365>

    URL:www.mohid.com <http://www.mohid.com>
             
    <http://www.ist.utl.pt>
    <http://www.mohid.com>
    Em 21-02-2014 12 <tel:21-02-2014%2012>:37, Matthieu Brucher escreveu:

    Hi,

    0 can be represented as 0.0 and -0.0 in floating point
    representation. Your actual data has both, that's all. It doesn't
    matter.

    Cheers,

    Matthieu

    2014-02-21 12:22 GMT+00:00 Eduardo Jauch
    <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>>:

        Hello :slight_smile:

        I'm generating some HDF files and in many datasets, when I
        open with HDFView, some of the values are set to -0.0, but
        they should be 0.0.

        Anyone found this already?

        Some hint on what can be?

        Best regards,
        Eduardo Jauch

        --

                  TECNICO Lisboa - MARETEC
        Sec��o de Ambiente e Energia

        Av. Rovisco Pais
        1049-001 Lisboa

        Tel.:+351 21 8419425 <tel:%2B351%2021%208419425>
        Fax:+351 21 8417365 <tel:%2B351%2021%208417365>

        URL:www.mohid.com <http://www.mohid.com>
                 
        <http://www.ist.utl.pt>
        <http://www.mohid.com>

        _______________________________________________
        Hdf-forum is for HDF software users discussion.
        Hdf-forum@lists.hdfgroup.org
        <mailto:Hdf-forum@lists.hdfgroup.org>
        http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

    -- Information System Engineer, Ph.D.
    Blog: http://matt.eifelle.com
    LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
    Music band: http://liliejay.com/

    _______________________________________________
    Hdf-forum is for HDF software users discussion.
    Hdf-forum@lists.hdfgroup.org <mailto:Hdf-forum@lists.hdfgroup.org>
    http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

    _______________________________________________
    Hdf-forum is for HDF software users discussion.
    Hdf-forum@lists.hdfgroup.org <mailto:Hdf-forum@lists.hdfgroup.org>
    http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org
http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

10

Just want to point out that 0.0 or -0.0 can give vastly different floating
point results, such as in 1/x. But it's probably not relevant for this case.

···

On Fri, Feb 21, 2014 at 2:47 PM, Eduardo Jauch <eduardo.jauch@ist.utl.pt>wrote:

Hello Matthieu,

I think you're right.

After inspecting the code, it fails not because of the -0.0, but because
of a problem associated with an "access violation", and HDF's with only
"positive" zeroes also causes the program to crash-

Strangely the error happens only when I read HDF's in 32 bit compiled
programs.
But there is a lot o things that can be causing this.

But most probably is something associated with compilation options or
exxternal libraries used. The code used to work in 32 bits and recently we
changed the compiler.

I'll update it (the compiler) and see if it fix this issue with the 32 bit
version.

Thanks!
Eduardo

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>
Em 21-02-2014 13:24, Matthieu Brucher escreveu:

If your code fails with those values, then something is definitely wrong
in your code. 0.0 and -0.0 behaves the same in floating point computations.
You can check the binary representation of the data, just to check that it
really is 0, and not some other small negative value.

Cheers,

Matthieu

2014-02-21 13:16 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt>:

Hello Matthieu,

The problem is that if I set the values of an array to 0.0, how is it
possible that it to be interpreted as -0.0?
And unfortunatelly, it seems it matter. The code that uses this data
works if compiled to 64 bits, but fails if compiled to 32 bits...

Cheers,
Eduardo.

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>
Em 21-02-2014 12:37, Matthieu Brucher escreveu:

Hi,

0 can be represented as 0.0 and -0.0 in floating point representation.
Your actual data has both, that's all. It doesn't matter.

Cheers,

Matthieu

2014-02-21 12:22 GMT+00:00 Eduardo Jauch <eduardo.jauch@ist.utl.pt>:

Hello :slight_smile:

I'm generating some HDF files and in many datasets, when I open with
HDFView, some of the values are set to -0.0, but they should be 0.0.

Anyone found this already?

Some hint on what can be?

Best regards,
Eduardo Jauch

--

TECNICO Lisboa - MARETEC
Secção de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com

  <http://www.ist.utl.pt>
<http://www.mohid.com>

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

_______________________________________________
Hdf-forum is for HDF software users discussion.Hdf-forum@lists.hdfgroup.orghttp://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

--
Information System Engineer, Ph.D.
Blog: http://matt.eifelle.com
LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
Music band: http://liliejay.com/

_______________________________________________
Hdf-forum is for HDF software users discussion.Hdf-forum@lists.hdfgroup.orghttp://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

_______________________________________________
Hdf-forum is for HDF software users discussion.
Hdf-forum@lists.hdfgroup.org

http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

11

Hum...

Interesting.
Mybe this will also afect "if's" that relay on defining if a value is >= 0.0, for example?

Anyway, I'll investigate also why the software that generates the HDF is (sometimes )creating -0.0 instead of 0.0.

Cheers,
Eduardo.

  TECNICO Lisboa - MARETEC
Sec��o de Ambiente e Energia

Av. Rovisco Pais
1049-001 Lisboa

Tel.: +351 21 8419425
Fax: +351 21 8417365

URL: www.mohid.com
         
<www.ist.utl.pt>
<www.mohid.com>

···

Em 21-02-2014 13:55, Filipe Maia escreveu:

Just want to point out that 0.0 or -0.0 can give vastly different floating point results, such as in 1/x. But it's probably not relevant for this case.

On Fri, Feb 21, 2014 at 2:47 PM, Eduardo Jauch > <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>> wrote:

    Hello Matthieu,

    I think you're right.

    After inspecting the code, it fails not because of the -0.0, but
    because of a problem associated with an "access violation", and
    HDF's with only "positive" zeroes also causes the program to crash-

    Strangely the error happens only when I read HDF's in 32 bit
    compiled programs.
    But there is a lot o things that can be causing this.

    But most probably is something associated with compilation options
    or exxternal libraries used. The code used to work in 32 bits and
    recently we changed the compiler.

    I'll update it (the compiler) and see if it fix this issue with
    the 32 bit version.

    Thanks!
    Eduardo

          TECNICO Lisboa - MARETEC
    Sec��o de Ambiente e Energia

    Av. Rovisco Pais
    1049-001 Lisboa

    Tel.:+351 21 8419425 <tel:%2B351%2021%208419425>
    Fax:+351 21 8417365 <tel:%2B351%2021%208417365>

    URL:www.mohid.com <http://www.mohid.com>
             
    <http://www.ist.utl.pt>
    <http://www.mohid.com>
    Em 21-02-2014 13 <tel:21-02-2014%2013>:24, Matthieu Brucher escreveu:

    If your code fails with those values, then something is
    definitely wrong in your code. 0.0 and -0.0 behaves the same in
    floating point computations.
    You can check the binary representation of the data, just to
    check that it really is 0, and not some other small negative value.

    Cheers,

    Matthieu

    2014-02-21 13:16 GMT+00:00 Eduardo Jauch
    <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>>:

        Hello Matthieu,

        The problem is that if I set the values of an array to 0.0,
        how is it possible that it to be interpreted as -0.0?
        And unfortunatelly, it seems it matter. The code that uses
        this data works if compiled to 64 bits, but fails if compiled
        to 32 bits...

        Cheers,
        Eduardo.

                  TECNICO Lisboa - MARETEC
        Sec��o de Ambiente e Energia

        Av. Rovisco Pais
        1049-001 Lisboa

        Tel.:+351 21 8419425 <tel:%2B351%2021%208419425>
        Fax:+351 21 8417365 <tel:%2B351%2021%208417365>

        URL:www.mohid.com <http://www.mohid.com>
                 
        <http://www.ist.utl.pt>
        <http://www.mohid.com>
        Em 21-02-2014 12 <tel:21-02-2014%2012>:37, Matthieu Brucher >> escreveu:

        Hi,

        0 can be represented as 0.0 and -0.0 in floating point
        representation. Your actual data has both, that's all. It
        doesn't matter.

        Cheers,

        Matthieu

        2014-02-21 12:22 GMT+00:00 Eduardo Jauch
        <eduardo.jauch@ist.utl.pt <mailto:eduardo.jauch@ist.utl.pt>>:

            Hello :slight_smile:

            I'm generating some HDF files and in many datasets, when
            I open with HDFView, some of the values are set to -0.0,
            but they should be 0.0.

            Anyone found this already?

            Some hint on what can be?

            Best regards,
            Eduardo Jauch

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        _______________________________________________
        Hdf-forum is for HDF software users discussion.
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        http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

    -- Information System Engineer, Ph.D.
    Blog: http://matt.eifelle.com
    LinkedIn: Matthieu Brucher - Squarepoint Capital | LinkedIn
    Music band: http://liliejay.com/

    _______________________________________________
    Hdf-forum is for HDF software users discussion.
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    http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

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    Hdf-forum is for HDF software users discussion.
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    http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org

_______________________________________________
Hdf-forum is for HDF software users discussion.
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