Exporting HDF5 format issues

[xiaozibuqi]

I noticed that the code directly stores the entire [t, x, y, p] events as a dataset in the HDF5 file. Now, I want to use the events in the output HDF5 file as a group and store t, x, y, and p as datasets separately. Where should I modify the source code?

[tobidelbruck]

Yuhuang would need to answer this.