You need to create the dataset with the "extendable" property. It's not possible to change this after the initial creation of the dataset. To do this, you need to use the "maxshape" keyword. A value of None
in the maxshape
tuple means that that dimension can be of unlimited size. So, if f
is an HDF5 file:
dset = f.create_dataset('mydataset', (2,2), maxshape=(None,3))
creates a dataset of size (2,2), which may be extended indefinitely along the first dimension and to 3 along the second. Now, you can extend the dataset with resize
:
dset.resize((3,3))
dset[:,:] = np.zeros((3,3),"=i4")
The first dimension can be increased as much as you like:
dset.resize((10,3))
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