merge -- merge hash tables

merge -- merge hash tables

Synopsis:

Usage: z = merge(x,y,g)

Input:

x: a hash table

y: a hash table

g: a function of two variables to be used to combine a value of x with a value of y when the corresponding keys coincide

Output:

z: a new hash table whose keys are the keys occuring in x or in y; the same values are used, except that if if a key k occurs in both arguments, then g(x#k,y#k) is used instead.

If x and y have the same class and parent, then the z will, too.

This function is useful for multiplying monomials or adding polynomials.

See also:

combine -- combine hash tables

Ways to use merge :

merge(HashTable,HashTable,Function)