Thank you ! So as i understand there is no way to automatically select
availlable data without knowing where it is.
WHen i read the data, i normally dont know wich part of the dataset is
full of data and wich part is not, so i will have to store an
hyperslab wich describe where the available data is.
Thanks for your help
Mathieu
Quoting Gerd Heber <[email protected]>:
That's why I asked you to define the smallest hyperslab or union
of hyperslabs, or point selections that cover you chunks and
read just those. The library will locate just those chunks
(tree traversal, not linear) and deal with them.
Have a look at section 7.4. Dataspaces and Data Transfer in the
user guide!
Best, G.
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Mathieu westphal
Sent: Thursday, May 10, 2012 8:15 AM
To: HDF Users Discussion List
Subject: Re: [Hdf-forum] Read All Available Chunk in a Dataset.
On 05/10/2012 02:01 PM, Gerd Heber wrote:
Mathieu, don't worry about the chunks. Just read/write what you need
in terms of the dataspace (hyperslab, point selection...) and the
library will determine for you which chunks are touched (read/written)
by the operation.
It'll just return fill values for un-allocated/partially filled chunks.
Yep you're right! But the time to read the data is linear with the size of
all the Dataset, not only of the size of available data !
My real dataset is really sparse ! i need to read all available value
without taking time to read unavailable value.
Is there anyway to select only real value?
Anyway how to know how many value are really read from dataset?
Thanks
Mathieu
Best, G.
-----Original Message-----
From: [email protected]
[mailto:[email protected]]
On Behalf Of Mathieu westphal
Sent: Thursday, May 10, 2012 6:46 AM
To: [email protected]
Subject: [Hdf-forum] Read All Available Chunk in a Dataset.
I have a dataset of size 16*16
I write Chunk of Data of size 4*4.
Some data aren't available so i wrote only 3 chunk on my dataset.
How to read only the 3 available chunk?
Thanks
Mathieu
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Hdf-forum is for HDF software users discussion.
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_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
