R语言【taxlist】——levels()：获取或设置分类等级列表

Package taxlist version 0.2.4

---

Description

分类层次结构可以设置为 taxlist 对象中的级别，按从低到高的顺序排列。

在 taxlist 对象中为特定分类概念添加分类级别。此外，概念限制的变化可能涉及其分类层次结构的变化。

---

Usage

levels(x)

## S3 method for class 'taxlist'
levels(x)

levels(x) <- value

## S3 replacement method for class 'taxlist'
levels(x) <- value

---

Arguments

参数【x】：一个 taxlist 对象。

参数【value】：替换值的字符向量。

---

Details

分类级别将作为 taxlist 对象中的因子进行处理。这些级别对于创建相关组的子集很有用（例如，通过函数 get_children（） 或 get_parents（））。

与父子关系相结合的级别将进一步用于检查分类列表的一致性。

还实现了表单 levels（x） <- value 的替换方法。

---

Value

具有添加或修改的分类级别的字符向量或 taxlist 对象。

---

Examples

levels(Easplist)

[1] "form"       "variety"    "subspecies" "species"    "complex"   
[6] "genus"      "family"

levels(Easplist) <- c("form", "variety", "subspecies", "species", "complex",
    "aggregate", "genus", "family")
summary(Easplist)

object size: 761.5 Kb 
validation of 'taxlist' object: TRUE 

number of taxon usage names: 5393 
number of taxon concepts: 3887 
trait entries: 311 
number of trait variables: 1 
taxon views: 3 

concepts with parents: 3698 
concepts with children: 1343 

hierarchical levels: form < variety < subspecies < species < complex < aggregate < genus < family 
number of concepts in level form: 2
number of concepts in level variety: 95
number of concepts in level subspecies: 71
number of concepts in level species: 2521
number of concepts in level complex: 1
number of concepts in level aggregate: 0
number of concepts in level genus: 1011
number of concepts in level family: 186