Each of the first three calling sequences, Insert( M, x, n ), Insert( M, x=n ), and Insert( M, [x, n] ), increments the multiplicity of x in the MultiSet M by n.

The fourth calling sequence, Insert( M, x ) is equivalent to Insert( M, x, 1 ).

The new multiplicity of x in M is returned.

To set the multiplicity of an element to a specific value, use the selection operator. For example, to set the multiplicity of x to 3, use M[x] := 3.

$M≔\mathrm{MultiSet}\left(a=2\,b=5\right)$

$M≔\left\{\left[a\,2\right]\,\left[b\,5\right]\right\}$

$\mathrm{Insert}\left(M\,b\,3\right)$

$8$

$\mathrm{Insert}\left(M\,c\right)$

$1$

$M$

$\left\{\left[a\,2\right]\,\left[b\,8\right]\,\left[c\,1\right]\right\}$

The MultiSet/Insert command was introduced in Maple 2016.

For more information on Maple 2016 changes, see Updates in Maple 2016.