convert(t, MultiSet) converts the expression t to a MultiSet, using the following rules:

if t is a MultiSet, then a copy of t is returned.

if t is a set or list, it is converted to a MultiSet by passing t (and the generalized option, if given) to the MultiSet object constructor.

if t is a table whose indices are expression sequences of length 1 and whose entries are positive integers (or any real numbers, if the generalized = true option is given), it is converted to a MultiSet whose elements are the table indices with multiplicities as given by the table entries.

if t is an algebraic expression of type * or ^, where the factor exponents are real numbers, it is converted to a MultiSet whose elements are the factors of the expression, with multiplicities the corresponding factor multiplicities; if the generalized = true option is not given, factors with non-positive-integer exponents will be treated as general algebraic expressions, with multiplicity 1.

if t is any other algebraic expression, the MultiSet constructed by the call MultiSet( [t, 1] ) (or MultiSet[generalized]( [t, 1] )) is returned.

The generalized = true option can be given simply as generalized.

convert( M, list ) converts the MultiSet M to a list; this is equivalent to [op(Entries(M))].

convert( M, set ) converts the MultiSet M to a set; this is equivalent to Members(M).

convert( M, table ) returns a copy of the Maple table which is used to hold the data which defines M; the indices of the returned table are the elements of M, and the entries of the table are the corresponding multiplicities.  Note that this table has the sparse indexing function.

$M≔\mathrm{convert}\left(\left[a\,b\,a\,c\right]\,\mathrm{MultiSet}\right)$

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

$\mathrm{convert}\left(M\,\mathrm{MultiSet}\right)$

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

$\mathrm{convert}\left(\mathrm{table}\left(\left[a=\frac{1}{3}\,b=-2\right]\right)\,\mathrm{MultiSet}\,\mathrm{generalized}\right)$

$\left\{\left[a\,\frac{1}{3}\right]\,\left[b\,\mathrm{-2}\right]\right\}$

$\mathrm{convert}\left(\frac{x^2{\left(x-3\right)}^3}{{\left(x^3-2x\right)}^2}\,\mathrm{MultiSet}\right)$

$\left\{\left[x\,2\right]\,\left[\frac{1}{{\left(x^3-2x\right)}^2}\,1\right]\,\left[x-3\,3\right]\right\}$

$\mathrm{convert}\left(\frac{x^2{\left(x-3\right)}^3}{{\left(x^3-2x\right)}^2}\,\mathrm{MultiSet}\,\mathrm{generalized}\right)$

$\left\{\left[x\,2\right]\,\left[x-3\,3\right]\,\left[x^3-2x\,\mathrm{-2}\right]\right\}$

$\mathrm{convert}\left(x^{\frac{1}{2}}{\left(1-x\right)}^{-\frac{3}{2}}\,\mathrm{MultiSet}\,\mathrm{generalized}\right)$

$\left\{\left[x\,\frac{1}{2}\right]\,\left[1-x\,-\frac{3}{2}\right]\right\}$

$\mathrm{convert}\left(M\,\mathrm{list}\right)$

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

$\mathrm{convert}\left(M\,\mathrm{set}\right)$

$\left\{a\,b\,c\right\}$

$t≔\mathrm{convert}\left(M\,\mathrm{table}\right)$

$t≔table\left(\mathrm{sparse}\,\left[c=1\,b=1\,a=2\right]\right)$

$t\left[d\right]≔3$

$t_d≔3$

$M$

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

The convert/MultiSet command was introduced in Maple 2016.

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