fold(VisibleList,Thing,Function) -- apply binary operator repeatedly

fold(VisibleList,Thing,Function) -- apply binary operator repeatedly

Synopsis:

Function: fold -- apply binary operator repeatedly

Input:

an instance of class VisibleList.

an instance of class Thing.

an instance of class Function.

Output:

an instance of class VisibleList.

fold({xn,...,x1},x0,f) -- computes f(...f(x2,f(x1,x0))...)}.

i1 : fold({a,b,c,d}, e, identity)



o1 = (a, (b, (c, (d, e))))



o1 : Sequence

Code:

     -- ../../../Macaulay2/m2/fold.m2:15
     fold(VisibleList,Thing,Function) := VisibleList => (v,x,f) -> (scan(reverse v, w -> x = f(w,x)); x)