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 > > _______________________________________________ > 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
