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
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*From:* Hdf-forum <hdf-forum-bounces@lists.hdfgroup.org> on behalf of Gaurav Bhalla <gauravbhalla82@gmail.com>
*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 > <bmribler@hdfgroup.org <mailto:bmribler@hdfgroup.org>> 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 <hdf-forum-bounces@lists.hdfgroup.org
<mailto:hdf-forum-bounces@lists.hdfgroup.org>> on behalf of Gaurav
Bhalla <gauravbhalla82@gmail.com <mailto:gauravbhalla82@gmail.com>>
*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 > <Scott.Mitchell@exelisinc.com > <mailto:Scott.Mitchell@exelisinc.com>> 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:hdf-forum-bounces@lists.hdfgroup.org
<mailto:hdf-forum-bounces@lists.hdfgroup.org>] *On Behalf Of
*Gaurav Bhalla
*Sent:* Sunday, May 04, 2014 10:40 PM
*To:* hdf-forum@lists.hdfgroup.org
<mailto:hdf-forum@lists.hdfgroup.org>
*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?
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