Adding a vector to matrix rows in numpy
For adding a 1d array to every row, broadcasting already takes care of things for you:
mat += vecHowever more generally you can use np.newaxis to coerce the array into a broadcastable form. For example:
mat + np.ones(3)[np.newaxis,:]While not necessary for adding the array to every row, this is necessary to do the same for column-wise addition:
mat + np.ones(5)[:,np.newaxis]EDIT: as Sebastian mentions, for row addition, mat + vec already handles the broadcasting correctly. It is also faster than using np.newaxis. I've edited my original answer to make this clear.