This utility function converts f to a multiset. A multiset is represented in the form $\[\[e_1\,m_1\]\,...\,\[e_n\,m_n\]\]$; it is a list of pairs where each $e_i$ is a value (an expression), and $m_i$ is its multiplicity (an integer).

If f is a table, each index is interpreted as a value and the associated entry (which should be an integer) is interpreted as its multiplicity.

If f is an algebraic expression, each factor is interpreted as a value, and the exponent to which this factor is raised (which should be an integer) is interpreted as its multiplicity.

If f is a list, the number of instances of each entry in the list is interpreted as its multiplicity.

Note: The output from this command is a list-of-lists structure, which is not the same as the MultiSet object introduced in Maple 2016.

$t≔\mathrm{table}\left(\left[x=1\,y=3\,z=2\right]\right)\:$

$\mathrm{convert}\left(t\,\mathrm{multiset}\right)$

$\left[\left[y\,3\right]\,\left[z\,2\right]\,\left[x\,1\right]\right]$

$\mathrm{convert}\left(\frac{x{y}^3}{z^2}\,\mathrm{multiset}\right)$

$\left[\left[x\,1\right]\,\left[y\,3\right]\,\left[z\,\mathrm{-2}\right]\right]$

$\mathrm{convert}\left(\left[x\,y\,z\,y\,z\,y\right]\,\mathrm{multiset}\right)$

$\left[\left[y\,3\right]\,\left[z\,2\right]\,\left[x\,1\right]\right]$