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https://github.com/triqs/dft_tools
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39 lines
1.2 KiB
ReStructuredText
39 lines
1.2 KiB
ReStructuredText
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.. highlight:: c
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Simple read/write operations of an array (or a view)
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============================================================================
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Given an array (or an array_view), the functions `h5::write` and `h5::read` write and read it to/from the file
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or any subgroup thereof. For example :
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.. compileblock::
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#include <triqs/arrays.hpp>
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using triqs::arrays::array; using triqs::arrays::matrix;
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int main(){
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array<double,2> A(2,2); A() = 3; // declare and init
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H5::H5File file("store_A.h5",H5F_ACC_TRUNC); // open the file
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h5_write(file,"A",A); // write the array as 'A' into the file
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//array<double,2> B; // read the file into B
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matrix<double> B; // read the file into B
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h5_read (file, "A",B);
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std::cout << "B = "<<B<<std::endl;
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h5_write(file,"B",B);
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}
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.. literalinclude:: examples_code/h5_rw.cpp
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Note that :
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* The data in the hdf5 file are stored in C order.
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* The data is reordered in Fortran (or custom) order if necessary when reading/writing.
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* It also works with matrix and vector (but the storage is the same in HDF5).
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* It also works with the corresponding views. TO BE ILLUSTRATED.
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