`CompareQuartetsMulti()`

counts how many quartets in one tree are resolved
in the same way or different ways in a forest of comparison trees.

`CompareQuartetsMulti(x, cf)`

- x
Object of class

`phylo`

representing the tree of interest.- cf
Comparison tree of class

`phylo`

, or list thereof, each with the same leaves as`x`

.

`CompareQuartetsMulti()`

returns a named integer vector specifying
the number of quartets whose resolution in `x`

matches all or any of the
resolutions in `cf`

.
Named elements are:

- N
The total number of quartet

*statements*for the given number of*n*-leaf trees, i.e.*n_trees*×*Q*.- Q
The total number of quartets for

*n*leaves.- s_all
The number of quartets that are resolved identically in all trees.

- s_any
The number of quartets that are resolved in

`x`

, and identically in at least one of`cf`

.- d_all
The number of quartets that are resolved in every tree in

`cf`

, but never in the same way as they are resolved in in`x`

.- d_any
The number of quartets in

`x`

that are resolved differently (i.e. contradicted) in at least one tree in`cf`

.- r1_all
The number of quartets that are resolved in

`x`

, but not in any of`cf`

.- r1_any
The number of quartets that are resolved in

`x`

, but unresolved in at least one of`cf`

.- r2_all
The number of quartets that are resolved in all of

`cf`

, but not in`x`

.- r2_any
The number of quartets that are resolved in at least one of

`cf`

, but not in`x`

.- u_all
The number of quartets that are unresolved in all trees.

- u_any
The number of quartets that are unresolved in

`x`

and at least one tree in`cf`

.- x_only
The number of quartets in

`x`

that are not resolved the same way in any of`cf`

.

`CompareQuartetsMulti()`

explicitly evaluates each quartet in each tree.
As such its runtime will increase hyper-exponentially with the number of
leaves in trees being compared. 30 leaves will take around 5 seconds;
40 closer to 20 s, and 50 around a minute.

Other element-by-element comparisons:
`CompareQuartets()`

,
`CompareSplits()`

,
`PairSharedQuartetStatus()`

,
`QuartetState()`

,
`SharedQuartetStatus()`

,
`SplitStatus()`

Other quartet counting functions:
`AllQuartets()`

,
`CompareQuartets()`

,
`ResolvedQuartets()`

```
library('TreeTools')
CompareQuartetsMulti(x = CollapseNode(as.phylo(42, 6), 8:9),
cf = list(BalancedTree(6), PectinateTree(6),
CollapseNode(as.phylo(1337, 6), 9:10)))
#> N Q s_all s_any d_all d_any r1_all r1_any r2_all r2_any u_all
#> 60 15 0 4 4 9 0 7 1 3 0
#> u_any x_only
#> 2 8
```