matrix.sum(axis=None, dtype=None, out=None)

record.strides tuple of bytes steps in each dimension

matrix.tolist()

record.nbytes length of item in bytes

class numpy.matrix

record.data pointer to start of data

matrix.round(decimals=0, out=None) Return a with each element rounded to the given number of decimals. Refer

matrix.item(*args) Copy an element of an array to a standard Python scalar and return it.

recarray.std(axis=None, dtype=None, out=None, ddof=0, keepdims=False) Returns the standard deviation of the array elements

recarray.fill(value) Fill the array with a scalar value.