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Mathematica > Rearranging & Restructuring Lists >

Built-in Mathematica Symbol

Riffle

Riffle[{e₁, e₂, ...}, x]
gives {e₁, x, e₂, x, ...}.

Riffle[{e₁, e₂, ...}, {x₁, x₂, ...}]
gives {e₁, x₁, e₂, x₂, ...}.

Riffle[list, x, n]
yields a list in which every n

element is x.

Riffle[list, x, {i_min, i_max, n}]
yields a list in which x appears if possible at positions i_min, i_min+n, i_min+2n, ... , i_max.

If there are fewer x_i than gaps between e_i in Riffle[{e₁, e₂, ...}, {x₁, x₂, ...}], the x_i are used cyclically.

The specification {i_min, i_max, n} is of the type used in Take. Negative indices count from the end of the list.

"Riffle" x between successive elements in a list:

Riffle in x and y cyclically:

Riffle in x at every third position:

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