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Questions tagged [hdfql]

HDFql is a high-level language to work with HDF5 data, designed to be as simple and powerful as SQL.

21 questions
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3 answers

Filter HDF dataset from H5 file using attribute

I have an h5 file containing multiple groups and datasets. Each dataset has associated attributes. I want to find/filter the datasets in this h5 file based upon the respective attribute associated with it. Example: dataset1 =cloudy(attribute)…
sumit c
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VSCode/Cmake Tools: add external header library

I want to use a library called HDFQL in a C++ project in VSCode. I am trying to use the extension CMake Tools as much as possible. HDFQL is a header library and usually I would write the following CMakeLists.txt: cmake_minimum_required(VERSION…
Mr Squid
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Is there way to write hdf5 files row by row in Python?

For CSV files we could use writer = csv.writer(output) writer.writerow([a, b, c, d]) Is there anything like that for writing Hdf5 files?
SantoshGupta7
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Namespace exists but still getting declaration conflicts?

I am working with the HDFql C++ wrapper library and trying to integrate it with R via Rcpp. I'm an experienced coder in general, but not in C++ specifically. I made another post about trying to resolve an issue with declaration conflicts. The…
mikeck
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Add datetime to HDF5 chunks with HDFql

I have this code to write chunks of arrays to HDF5 and I want to add a timestamp attribute to each chunk or another field with a datetime using AS.HDFql; // declare variables float[,,] traindata = new float[1, 100, 500]; int number; int i; //…
Mario
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How to obtain a string type data in a dataset with HDFql in JAVA?

I'm new in HDF5 and HDFql, I'm working in java and I have a .h5 file with several groups, inside each group I have different Datasets, some are floating arrays, which I get as follows. https://gyazo.com/c10100b327d20a2db8c13f2fd9ab7668 Double[][]…
JavierSO
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HDFql Adding Data to Existing Dataset

I want to create a HDF5 file in C++ and dynamically add data to a dataset contained in that file. I have been having some trouble getting this work however, with this minimal example as my current best attempt (based mainly on an answer by…
Mr Squid
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2 answers

HDFql Saving and Loading Images

I am trying to save images from OpenCV to HDF5 using HDFql. Here is a minimal example of what I am trying to achieve (assuming you have an image at /tmp/lena.jpg): #include #include #include…
Mr Squid
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1 answer

Problem loading shared library using dyn.load on R Linux, but equivalent Windows build works fine

I've built a package for interacting with HDFql from R. It relies on the R wrapper and DLLs/SOs provided by HDFql 2.1.0. The packages works perfectly in Windows using the DLLs, but for some reason the HDFql library SOs fail to load in a Linux…
mikeck
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HDFql working with tables

I have some question on the usability of HDFql: Does HDFql support created of a table where the row are of different type? How do you append data to the table? How do you iterate though the row do the table? The table I want to create will have…
Johan
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Сorrect write from memory in hdfql to dataset

After reading the documentation, I still did not figure out how to write data from memory (variables) to datasets correctly. For example, with the construction CREATE TRUNCATE CHUNKED DATASET dsetint AS INT(UNLIMITED), "INSERT INTO dsetint (-1)…
OlegMart
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HDFql sequential writing to the structure dataset

I am trying to write a simple structure in hdf5 But I still can't add records to the already created dataset. The task itself is to store a set of bytes of arbitrary length and its size void WriteStructToFile(vector> fl_stream) { …
OlegMart
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importing multiple CSV files into hdf5 using hdfql?

I have to know how to use hdfql to import multiple csv files into one hdf5 file using hdfql method?
M-kh
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HDF5 files larger than expected using HDFql

Consider the following code, which simply dumps one million 2-Byte integers into a HDF5 file using HDFql: std::string filepath = "/tmp/test.h5"; sprintf(script_, "CREATE TRUNCATE FILE %s", filepath.c_str()); HDFql::execute(script_); sprintf(script_,…
Mr Squid
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HDFql Writing Very Slow

I have some code, which iteratively receives data which it dumps to a HDF5 file. Here is a toy example of what I am trying to achieve: #include void createHDF(const std::string & filepath) { char script_[1024]; sprintf(script_,…
Mr Squid
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