Sorry how do you mean, can you elaborate with some C++ syntax? Do you intend to use the H5A function. Sorry I am a bit n00b here.
On Mon, May 5, 2014 at 12:09 PM, Werner Benger <[email protected]> wrote: > Sounds as if creating three datasets of type double, named "TimeStamp", > "Property1" and "Property2" would do the job. > > Reading them into python as a matrix is a python issue. > > Werner > > > > On 05.05.2014 19:03, Binh-Minh Ribler wrote: > > You're welcome. I'm sorry but I don't think I'm able to help on this > question. Hopefully, some other users on the Forum will understand and > give some suggestions. > > > Binh-Minh > ------------------------------ > *From:* Hdf-forum > <[email protected]><[email protected]>on > behalf of Gaurav Bhalla > <[email protected]> <[email protected]> > *Sent:* Monday, May 05, 2014 12:18 PM > *To:* HDF Users Discussion List > *Subject:* Re: [Hdf-forum] Writing a string to an HDF5 file. > > Thanks a lot for the note. I am actually the same command, in visual > express 2010 in a C++ console app, and it seems to work. > > I am basically writing columnar data that is of the form > > TimeStamp Property1 Property2 > > > Now my question is how do I create a file header, in other words, if I > want to write the following array to the file... > > ['TimeStamp', 'Property1', 'Property2'] > > ...and tag it to the columns for ease of later use ( I am planning to > analyze the matrix in Python). How to do that? And I am looking to do that > C++. > > > dset = H5Dcreate(file, "dset1", H5T_NATIVE_DOUBLE, file_space, > H5P_DEFAULT, plist, H5P_DEFAULT); > > > > On Mon, May 5, 2014 at 11:04 AM, Binh-Minh Ribler > <[email protected]>wrote: > >> Hi Gaurav, >> >> >> If you're using the C++ API, your C statement >> >> dset = H5Dcreate(file, "dset1", H5T_NATIVE_DOUBLE, file_space, >> H5P_DEFAULT, plist, H5P_DEFAULT); >> >> >> would be something like this in C++: >> >> H5::DataSet dset = file.createDataSet("dset1", PredType::NATIVE_DOUBLE, >> data_space, plist); >> >> You can find it here: >> >> >> http://www.hdfgroup.org/HDF5/doc/cpplus_RM/classH5_1_1CommonFG.html#a12a4af21ca0231d4f2c4008b12177bb1 >> >> >> Is that what you're looking for? >> Binh-Minh >> ------------------------------ >> *From:* Hdf-forum <[email protected]> on behalf of >> Gaurav Bhalla <[email protected]> >> *Sent:* Monday, May 05, 2014 11:04 AM >> *To:* HDF Users Discussion List >> *Subject:* Re: [Hdf-forum] Writing a string to an HDF5 file. >> >> hanks a lot for your note, I appreciate your help. >> >> One more follow up question, I guess I am just hoping that you may be >> able to help me. The issue is that I am basically writing the file from C++ >> and then processing it downstream in Python. >> >> What would be the analogous statements in C++? >> >> I use this to create, >> >> dset = H5Dcreate(file, "dset1", H5T_NATIVE_DOUBLE, file_space, >> H5P_DEFAULT, plist, H5P_DEFAULT); >> >> I am guessing I should be able to somehow use the H5A function here >> also? >> >> >> >> On Mon, May 5, 2014 at 9:55 AM, Mitchell, Scott - Exelis < >> [email protected]> wrote: >> >>> There is no way to tag individual columns (i.e. fields in a compound >>> data type). And you certainly can't insert strings where doubles are >>> expected. What I've done is to tag the dataset with an H5A attribute (an >>> array of strings, one per field). In my case each string is the Unit >>> associated with the field. >>> >>> >>> >>> >>> >>> Scott >>> >>> >>> >>> *From:* Hdf-forum [mailto:[email protected]] *On >>> Behalf Of *Gaurav Bhalla >>> *Sent:* Sunday, May 04, 2014 10:40 PM >>> *To:* [email protected] >>> *Subject:* [Hdf-forum] Writing a string to an HDF5 file. >>> >>> >>> >>> I am trying to write an HDF5 file. The file basically contains a large >>> timeseries matrix in the following format >>> >>> >>> >>> TimeStamp Property1 Property2 >>> >>> I have managed to write the data successfully, I created a dset and used >>> the H5Dwrite function. >>> >>> Now my question is how do I create a file header, in other words, if I >>> want to write the following array to the file... >>> >>> ['TimeStamp', 'Property1', 'Property2'] >>> >>> ...and tag it to the columns for ease of later use ( I am planning to >>> analyze the matrix in Python). How to do that? >>> >>> I tried to use H5Dwrite to write a string array but failed, I guess it >>> wanted consistent datatypes, so it just wanted floats, which is the >>> datatype for my data. Then I read about this metadata thing, but I am a bit >>> lost as to how to use it? Any help would be much appreciated. >>> >>> A related side question is can the first row of a matrix be a string and >>> the others rows contain doubles? >>> >>> ------------------------------ >>> >>> This e-mail and any files transmitted with it may be proprietary and are >>> intended solely for the use of the individual or entity to whom they are >>> addressed. If you have received this e-mail in error please notify the >>> sender. Please note that any views or opinions presented in this e-mail are >>> solely those of the author and do not necessarily represent those of Exelis >>> Inc. The recipient should check this e-mail and any attachments for the >>> presence of viruses. Exelis Inc. accepts no liability for any damage caused >>> by any virus transmitted by this e-mail. >>> >>> _______________________________________________ >>> Hdf-forum is for HDF software users discussion. >>> [email protected] >>> >>> http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org >>> >>> >> >> _______________________________________________ >> Hdf-forum is for HDF software users discussion. >> [email protected] >> >> http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org >> >> > > > _______________________________________________ > Hdf-forum is for HDF software users > [email protected]http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org > > > -- > ___________________________________________________________________________ > 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 > > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > > http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org > >
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