Length

Length(expr)

returns the number of leaves in expr.

Examples

Length of a list:

>> Length({1, 2, 3})
3

‘Length’ operates on the ‘FullForm’ of expressions:

>> Length(Exp(x))
2

>> FullForm(Exp(x))
Power(E, x)

The length of atoms is 0:

>> Length(a)
0

Note that rational and complex numbers are atoms, although their ‘FullForm’ might suggest the opposite:

>> Length(1/3)
0

>> FullForm(1/3)
Rational(1, 3)

Implementation status

• ✅ - full supported

Github

• Implementation of Length