- The
`array()`built-in function: returns a`numpy.ndarray`from a list of elements (or list of lists,...), from a tuple (or tuple of tuples,...), or even from any valid`numpy.ndarray`. The array constructor also takes an optional`dtype`(see above), an optional`savespace`argument, and an optional`copy`argument (see below).

Try also`ones()`or`zeros()`with a tuple containing dimensions as argument to create new arrays. - The
`size()`built-in function: displays the number of elements of the input array. - The
`rank()`built-in function: displays the number of dimensions of the input array (0 = scalar, 1 = vector, etc). - The
`len()`built-in function: displays the number of elements of the input array along the first dimension. - See also:
`reshape()`.

Gildas manager 2014-07-01