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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
Perhaps you could use one of the built-in iterators, such as Array.getRangeIterator <http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/javadoc/ucar/ma2/Array.html#getRangeIterator-java.util.List-> (java.util.List<Range <http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/javadoc/ucar/ma2/Range.html> > ranges) On Thu, Jan 26, 2017 at 7:58 AM, Hanns Holger Rutz <rutz@xxxxxx> wrote: > hi there, > > for the record, i managed to implement an algorithm that solves > this ( > https://stackoverflow.com/questions/41850946/linearly- > reading-a-multi-dimensional-array-obeying-dimensional-sub- > sectioning#41870662 > shows how to generate the sub-ranges within the overall section to be read > ) > > best, .h.h. > > > On 25/01/17 12:20, Hanns Holger Rutz wrote: > > hi there, > > > > I have a scenario where I need to read the entire contents of a > > multi-dimensional section'ed variable piecewise linearly. > > > > for example, say the variable has shape [a][b][c] and I have section'ed > > it as [s1][s2][s3]. say data type is double. now i need to read the > > stream of elements, the total size of which is s1.size * s2.size * > > s3.size in chunks, for example of chunk size x. > > > > the API for variable doesn't allow me to specify "flat" linear indices, > > so I need to calculate intermediate sub-sections, I guess. this looks > > very complicated because the chunk size x might not be a simple multiple > > of s3.size, s2.size*s3.size, etc. > > > > So I can only think of two approaches: read "too" much data and then > > throw away some. Read multiple times; perhaps this problem can be > > formulated in maximally three read calls? > > > > Has anyone solved this somehow? Or is there a trick in the API that I > > haven't seen, to get a linear read command that preserves the offsets > > and strides of sections? > > > > thanks, .h.h. > > > > _______________________________________________ > > NOTE: All exchanges posted to Unidata maintained email lists are > > recorded in the Unidata inquiry tracking system and made publicly > > available through the web. Users who post to any of the lists we > > maintain are reminded to remove any personal information that they > > do not want to be made public. > > > > > > netcdf-java mailing list > > netcdf-java@xxxxxxxxxxxxxxxx > > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > > > > > > _______________________________________________ > NOTE: All exchanges posted to Unidata maintained email lists are > recorded in the Unidata inquiry tracking system and made publicly > available through the web. Users who post to any of the lists we > maintain are reminded to remove any personal information that they > do not want to be made public. > > > netcdf-java mailing list > netcdf-java@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- Sincerely, Bob Simons IT Specialist Environmental Research Division NOAA Southwest Fisheries Science Center 99 Pacific St., Suite 255A (New!) Monterey, CA 93940 (New!) Phone: (831)333-9878 (New!) Fax: (831)648-8440 Email: bob.simons@xxxxxxxx The contents of this message are mine personally and do not necessarily reflect any position of the Government or the National Oceanic and Atmospheric Administration. <>< <>< <>< <>< <>< <>< <>< <>< <><
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