| Help with HDF_VD_WRITE - field names [message #59644] |
Fri, 04 April 2008 07:29  |
Thiago Biscaro
Messages: 4
Registered: December 2005
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Junior Member |
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Hi everybody
I'm trying to write a Vdata to an HDF file, but for some reason, the
only field description IDL accepts is 'PX', like the example in the
IDL user's guide.
The command
HDF_VD_WRITE, Vdat, 'PX', intarr(5)
works fine, but
HDF_VD_WRITE, Vdat, 'RR', intarr(5)
returns
HDF_VD_WRITE: Unable to set the VDATA fieldnames to <STRING ('RR')>.
I need to set the field name to something that I can understand later,
so PX is not an option... Any ideas on how to sole this? I know I can
write as an SDS, but I need to do as Vdata for compatibility with some
files we process here.
Thanks!
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| Re: Help with HDF_VD_WRITE - field names [message #59676 is a reply to message #59644] |
Tue, 08 April 2008 05:47  |
Thiago Biscaro
Messages: 4
Registered: December 2005
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Junior Member |
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On 7 abr, 14:37, jameskuy...@verizon.net wrote:
> Thiago Biscaro wrote:
>> Hi everybody
>
>> I'm trying to write a Vdata to an HDF file, but for some reason, the
>> only field description IDL accepts is 'PX', like the example in the
>> IDL user's guide.
>
>> The command
>
>> HDF_VD_WRITE, Vdat, 'PX', intarr(5)
>
>> works fine, but
>
>> HDF_VD_WRITE, Vdat, 'RR', intarr(5)
>
>> returns
>
>> HDF_VD_WRITE: Unable to set the VDATA fieldnames to <STRING ('RR')>.
>
>> I need to set the field name to something that I can understand later,
>> so PX is not an option... Any ideas on how to sole this? I know I can
>> write as an SDS, but I need to do as Vdata for compatibility with some
>> files we process here.
>
> The following code works fine for me. Could you provide a more precise
> explanation of what you're trying to do?
>
> filename = 'test.hdf'
> fieldname = 'RR'
>
> file = HDF_Open(filename,/CREATE)
> Vdat = HDF_VD_Attach(file, -1)
> HDF_VD_FDefine, Vdat, fieldname
> ; /INT, ORDER=5HDF_VD_WRITE, Vdat, fieldname, intarr(5)
> HDF_VD_Detach, Vdat
> HDF_Close, file
Yes, this works just fine. I didn't know that I had to pre-define the
field name with the HDF_VD_DEFINE. Thank you very much!
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| Re: Help with HDF_VD_WRITE - field names [message #59686 is a reply to message #59644] |
Mon, 07 April 2008 10:37 |
jameskuyper
Messages: 79
Registered: October 2007
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Member |
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Thiago Biscaro wrote:
> Hi everybody
>
> I'm trying to write a Vdata to an HDF file, but for some reason, the
> only field description IDL accepts is 'PX', like the example in the
> IDL user's guide.
>
> The command
>
> HDF_VD_WRITE, Vdat, 'PX', intarr(5)
>
> works fine, but
>
> HDF_VD_WRITE, Vdat, 'RR', intarr(5)
>
> returns
>
> HDF_VD_WRITE: Unable to set the VDATA fieldnames to <STRING ('RR')>.
>
> I need to set the field name to something that I can understand later,
> so PX is not an option... Any ideas on how to sole this? I know I can
> write as an SDS, but I need to do as Vdata for compatibility with some
> files we process here.
The following code works fine for me. Could you provide a more precise
explanation of what you're trying to do?
filename = 'test.hdf'
fieldname = 'RR'
file = HDF_Open(filename,/CREATE)
Vdat = HDF_VD_Attach(file, -1)
HDF_VD_FDefine, Vdat, fieldname
; /INT, ORDER=5
HDF_VD_WRITE, Vdat, fieldname, intarr(5)
HDF_VD_Detach, Vdat
HDF_Close, file
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