mirror of
https://github.com/triqs/dft_tools
synced 2024-12-27 06:43:40 +01:00
39 lines
1.2 KiB
ReStructuredText
39 lines
1.2 KiB
ReStructuredText
|
.. highlight:: c
|
||
|
|
|
||
|
|
Simple read/write operations of an array (or a view)
|
||
|
|
============================================================================
|
||
|
|
|
||
|
|
Given an array (or an array_view), the functions `h5::write` and `h5::read` write and read it to/from the file
|
||
|
|
or any subgroup thereof. For example :
|
||
|
|
|
||
|
|
.. compileblock::
|
||
|
|
|
||
|
|
#include <triqs/arrays.hpp>
|
||
|
|
using triqs::arrays::array; using triqs::arrays::matrix;
|
||
|
|
int main(){
|
||
|
|
|
||
|
|
array<double,2> A(2,2); A() = 3; // declare and init
|
||
|
|
|
||
|
|
H5::H5File file("store_A.h5",H5F_ACC_TRUNC); // open the file
|
||
|
|
h5_write(file,"A",A); // write the array as 'A' into the file
|
||
|
|
|
||
|
|
//array<double,2> B; // read the file into B
|
||
|
|
matrix<double> B; // read the file into B
|
||
|
|
h5_read (file, "A",B);
|
||
|
|
std::cout << "B = "<<B<<std::endl;
|
||
|
|
h5_write(file,"B",B);
|
||
|
|
}
|
||
|
|
|
||
|
|
.. literalinclude:: examples_code/h5_rw.cpp
|
||
|
|
|
||
|
|
Note that :
|
||
|
|
|
||
|
|
* The data in the hdf5 file are stored in C order.
|
||
|
|
|
||
|
|
* The data is reordered in Fortran (or custom) order if necessary when reading/writing.
|
||
|
|
|
||
|
|
* It also works with matrix and vector (but the storage is the same in HDF5).
|
||
|
|
|
||
|
|
* It also works with the corresponding views. TO BE ILLUSTRATED.
|
||
|
|
|