hpaulj questions

hpaulj answers

• This (modulo 2) binary matrix multiplication algorithm seems to underperform. What can I do better?
• Display subgroups of commands with argparse subparser
• NumPy vectorize() or dot() appears buggy
• scipy.linalg.block_diag vs scipy.sparse.block_diag in terms of efficiency
• loading a sparse matrix saved with np.save
• How should I use the h5py library for storing time series data?
• Numpy savetxt saves 1D array as column
• How is Python statement x=x+1 implemented?
• A function that finds the difference between elements of a 1D array/list e.g. x[n]-x[n-1], x[n-2]-x[n-1] where n is the size of the array/list
• Cannot cast ufunc 'add' output from dtype('float64') to dtype('int64') with casting rule 'same_kind'