R Language Learning Note 2

Data

5 Basic types of objects

-character (character) x <-"Hello World"

-Value (numeric:real numbers): x <-1 x <-3.14

-Integers (integer): x <-2L(using L Special Declaration x is an integer)

-Plural (complex): x <-1+2i

-Logic (Logical:true/false): x <-True

#使用class (x) to view the data type of X

Properties (Attribute)

-Names (name)

-Dimensions (Dimensions:matrix, array)

-Type (Class)

-Lengths (length)

Vector--can only contain objects of the same type

Where X3 because a vector can only contain objects of the same type, all objects are cast to the character type.

Use "AS." + "Object Type" to cast. X4 because R does not know how to convert a,b,c to numbers, a missing value is introduced.

Use Class () to view the type of the object.

Use names () to name the object.

R Language Learning Note 2