Hi Werner, I guess what you're implying is that I copy the components being written to file (Element belonging to ObjectArray[i]) to a different, more appropriate datatype such as an array: ElementTemp[i]. However I want to avoid doing this copying at every time step. There also doesn't seem a way to make a reference to this data, else I could just use that to write. What am I missing here?
Aman From: Hdf-forum [mailto:[email protected]] On Behalf Of Werner Benger Sent: Friday, July 22, 2016 7:58 AM To: [email protected] Subject: [Ext] Re: [Hdf-forum] Writing subset of compound datatype Hi, you probably want a different datatype in the file than in memory, i.e. in memory you want a datatype that describes the entire class, but for the file type one that only refers to the components written. Werner On 22.07.2016 00:22, Aman Verma wrote: I want to write, in a single line, the elements: ObjectArray[i].Element (0<=i<n) without having to copy the elements into a separate array altogether. Using CompType and insertMember, I am writing just a subset (including Element) of an array of a compound datatype ObjectArray (a class/object in my case). H5::CompType mtype(sizeof(Class)); mtype.insertMember("MD", HOFFSET(Class, dMD), datatype); H5::DataSet dataset = solution.createDataSet( "/Well", mtype, dataspace, ds_creatplist ); dataset.write( ObjectArray, mtype ); This works fine. However, not unexpectedly, since I am defining the CompType with the size of the whole class (Class), while writing out only a subset (Element), my .h5 file is bigger (sizeof(Class)) than it should be (sizeof(Element)). I am already using compression. Is there a way to 'delete' this unused space? Or is there a better way to do what I'm trying to achieve? Is using hyperslab the right answer? Thanks _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected]<mailto:[email protected]> http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.hdfgroup.org_mailman_listinfo_hdf-2Dforum-5Flists.hdfgroup.org&d=CwMD-g&c=uGuXJ43KPkPWEl2imVFDmZQlhQUET7pVRA2PDIOxgqw&r=Gubd6RtL_7XTb1ohYqqB8g&m=lKbmU4P9LiV-MFkYAWcKHGHdB0pPdG8BSuvpDHzqF4M&s=B8ATgTheCadpzj1Vzl1CaOJxX4aLFeR48nDvXd2HE4k&e=> Twitter: https://twitter.com/hdf5<https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_hdf5&d=CwMD-g&c=uGuXJ43KPkPWEl2imVFDmZQlhQUET7pVRA2PDIOxgqw&r=Gubd6RtL_7XTb1ohYqqB8g&m=lKbmU4P9LiV-MFkYAWcKHGHdB0pPdG8BSuvpDHzqF4M&s=QqA7m5AzKDNF2kyO9CAAnZPTyo-Qm1ExdLTzF8pI7Qw&e=> -- ___________________________________________________________________________ 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
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