NumPy : arange , zeros , ones

Return evenly spaced values within a given interval.

Values are generated within the half-open interval [start, stop) (in other words, the interval including start but excluding stop). For integer arguments the function is equivalent to the Python built-in range function, but returns an ndarray rather than a list.

Parameters
startinteger or real, optional
Start of interval. The interval includes this value. The default start value is 0.

stopinteger or real
End of interval. The interval does not include this value, except in some cases where step is not an integer and floating point round-off affects the length of out.

stepinteger or real, optional
Spacing between values. For any output out, this is the distance between two adjacent values, out[i+1] - out[i]. The default step size is 1. If step is specified as a position argument, start must also be given.

dtypedtype
The type of the output array. If dtype is not given, infer the data type from the other input arguments.

likearray_like
Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

Returns
arangendarray
Array of evenly spaced values.

For floating point arguments, the length of the result is ceil((stop - start)/step). Because of floating point overflow, this rule may result in the last element of out being greater than stop.

Return a new array of given shape and type, filled with zeros.

Parameters
shapeint or tuple of ints
Shape of the new array, e.g., (2, 3) or 2.

dtypedata-type, optional

order{‘C’, ‘F’}, optional, default: ‘C’
Whether to store multi-dimensional data in row-major (C-style) or column-major (Fortran-style) order in memory.

likearray_like
Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

Returns
outndarray
Array of zeros with the given shape, dtype, and order.

Return a new array of given shape and type, filled with ones.

Parameters
shapeint or sequence of ints
Shape of the new array, e.g., (2, 3) or 2.

dtypedata-type, optional

order{‘C’, ‘F’}, optional, default: C
Whether to store multi-dimensional data in row-major (C-style) or column-major (Fortran-style) order in memory.

likearray_like
Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

Returns
outndarray
Array of ones with the given shape, dtype, and order.