foamToVTK -fields syntax problem

KateEisenhower · September 13, 2016, 11:25

Hello all,

I know it sounds really odd, but I have a problem with the foamToVTK syntax. I try to convert field data (in this case pressure) to the VTK format by typing

Code:

foamToVTK -fields p

I get the error message:

Code:

--> FOAM FATAL IO ERROR: 
incorrect first token, expected <int> or '(', found on line 0 the word 'p'

I cannot find any reason why foamToVTK is expecting an integer here. And yes, I have tried

Code:

foamToVTK -fields (p)

too as proposed.

Thanks in advance and best regards,

Kate

tomf · September 14, 2016, 04:51

Hi Kate,

Code:

foamToVTK -fields '(p)'

Works for me. Probably the apostrophes are needed to let OpenFOAM know it is a list of words between the brackets.

Best Regards,
Tom

alexeym · September 14, 2016, 08:12

Hi,

Little addition from foamToVTK.C ($FOAM_APP/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C) header:

Code:

Usage
    \b foamToVTK [OPTION]

    Options:
      ...
      - \par -fields \<fields\>
        Convert selected fields only. For example,
        \verbatim
          -fields "( p T U )"
        \endverbatim
        The quoting is required to avoid shell expansions and to pass the
        information as a single argument.
    ...

KateEisenhower · September 16, 2016, 06:29

Thank you both,

Don't you think the error message I posted above could be missunderstood easily and should be changed in the source code?

Best regards,

Kate

tomf · September 16, 2016, 06:39

Hi,

I am not certain whether that is easily done. It looks a lot like standard syntax error output and it is probably reused in multiple locations. Maybe the usage or help can be improved somehow. I would suggest you file a bug report with a suggested improved error message here:

http://bugs.openfoam.org/

Tom

KateEisenhower · September 22, 2016, 06:56

Hello all,

see bug report 0002252.

Best regards,

Kate

September 13, 2016, 11:25	foamToVTK -fields syntax problem	#1
KateEisenhower Senior Member Join Date: Mar 2015 Posts: 250 Rep Power: 12	Hello all, I know it sounds really odd, but I have a problem with the foamToVTK syntax. I try to convert field data (in this case pressure) to the VTK format by typing Code: foamToVTK -fields p I get the error message: Code: --> FOAM FATAL IO ERROR: incorrect first token, expected <int> or '(', found on line 0 the word 'p' I cannot find any reason why foamToVTK is expecting an integer here. And yes, I have tried Code: foamToVTK -fields (p) too as proposed. Thanks in advance and best regards, Kate Last edited by KateEisenhower; September 22, 2016 at 06:52.

September 14, 2016, 04:51		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 646 Rep Power: 32	Hi Kate, Code: foamToVTK -fields '(p)' Works for me. Probably the apostrophes are needed to let OpenFOAM know it is a list of words between the brackets. Best Regards, Tom

September 14, 2016, 08:12		#3
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,938 Rep Power: 39	Hi, Little addition from foamToVTK.C ($FOAM_APP/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C) header: Code: Usage \b foamToVTK [OPTION] Options: ... - \par -fields \<fields\> Convert selected fields only. For example, \verbatim -fields "( p T U )" \endverbatim The quoting is required to avoid shell expansions and to pass the information as a single argument. ... tomf and Ramsky like this.

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September 16, 2016, 06:29		#4
KateEisenhower Senior Member Join Date: Mar 2015 Posts: 250 Rep Power: 12	Thank you both, Don't you think the error message I posted above could be missunderstood easily and should be changed in the source code? Best regards, Kate

September 16, 2016, 06:39		#5
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 646 Rep Power: 32	Hi, I am not certain whether that is easily done. It looks a lot like standard syntax error output and it is probably reused in multiple locations. Maybe the usage or help can be improved somehow. I would suggest you file a bug report with a suggested improved error message here: http://bugs.openfoam.org/ Tom

September 22, 2016, 06:56		#6
KateEisenhower Senior Member Join Date: Mar 2015 Posts: 250 Rep Power: 12	Hello all, see bug report 0002252. Best regards, Kate