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Mathematica > Core Language > Expressions > Expression Structure > LeafCount >

BUILT-IN MATHEMATICA SYMBOL

LeafCount

LeafCount[expr]
gives the total number of indivisible subexpressions in expr.

LeafCount counts the number of subexpressions in expr that correspond to "leaves" on the expression tree.

Numbers with heads Rational and Complex are treated as composite objects, just as in FullForm.

Find the number of "leaves" in an expression tree:

Out[1]=

Out[2]=

Find leafcount measures of the sizes of successive integrals:

Make Simplify pick expressions with minimum LeafCount:

Find leafcounts in combinator expressions

LeafCount includes the head and all elements inside it:

LeafCount is based on the FullForm of expressions:

LeafCount counts elements in rational and complex numbers just as in FullForm:

Integers of any size are still treated as single expression leaves:

LeafCount treats SparseArray objects as single expression leaves:

Unlike TreeForm, LeafCount takes into consideration the structure of expression heads:

This shows the expression tree whose leaves are counted by LeafCount: