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bmribler
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These examples are referred to from the replacement page of https://portal.hdfgroup.org/display/HDF5/Other+Examples.
47 lines
899 B
Python
47 lines
899 B
Python
#
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# This example creates a dataset and then extends it by rows and then by columns.
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#
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import h5py
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import numpy as np
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#
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# Create unlim.h5 file.
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#
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file = h5py.File('unlim.h5','w')
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#
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# Create /DS1 dataset; in order to use compression, dataset has to be chunked.
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#
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dataset = file.create_dataset('DS1',(4,7),'i',chunks=(3,3), maxshape=(None, None))
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#
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# Initialize data.
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#
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data = np.zeros((4,7))
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#
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# Write data.
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#
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print("Writing data...")
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dataset[...] = data
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file.close()
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#
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# Read data back; display compression properties and dataset max value.
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#
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file = h5py.File('unlim.h5','r+')
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dataset = file['DS1']
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data = dataset[...]
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print("Data before extension: ")
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print(data)
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#
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# Add two rows filled with 1
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#
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dataset.resize((6,7))
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dataset[4:6] = 1
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#
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# Add three columns filled with 2
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#
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dataset.resize((6,10))
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dataset[:,7:10] = 2
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data = dataset[...]
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print("Data after extension: ")
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print(data)
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file.close()
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