在R中创建向量有哪些限制?
在R中创建向量有四个主要限制。在创建任何类型的向量时,我们必须记住这些限制-
向量名称不能带有%符号。
向量名称不能以数字开头。
向量可以以点开头,但后面不能有数字。
向量不能以下划线开头。
例子
带%符号的向量-
x1%<-1:20Error: unexpected input in "x1%<-1:20"
x1%first<-1:20
Error: unexpected input in "x1%first<-1:20"
%x1<-1:20
Error: unexpected input in "%x1<-1:20"
x1_%_first<-1:20
Error: unexpected input in "x1_%_first<-1:20"
x1first_1_%<-1:20
Error: unexpected input in "x1first_1_%<-1:20"
x1first__%<-1:20
Error: unexpected input in "x1first__%<-1:20"
以数字开头的向量-
1x<-1:20Error: unexpected symbol in "1x"
1_x<-1:20
Error: unexpected input in "1_"
101_x<-1:20
Error: unexpected input in "101_"
123_x<-1:20
Error: unexpected input in "123_"
1number_x<-1:20
Error: unexpected symbol in "1number_x"
1number<-1:20
Error: unexpected symbol in "1number"
以点开头的向量-
.x1<-1:10.x1
[1] 1 2 3 4 5 6 7 8 9 10
.1x<-1:10
Error: unexpected symbol in ".1x"
.1_x<-1:10
Error: unexpected input in ".1_"
.100_x<-1:10
Error: unexpected input in ".100_"
.1of_x<-1:10
Error: unexpected symbol in ".1of_x"
.2of_x<-1:10
Error: unexpected symbol in ".2of_x"
.1ofx<-1:10
Error: unexpected symbol in ".1ofx"
以下划线开头的向量-
_x1<-1:10Error: unexpected input in "_"
_first<-1:10
Error: unexpected input in "_"
_first_variable<-1:10
Error: unexpected input in "_"
_variable1<-1:10
Error: unexpected input in "_"
_firstvariable<-1:10
Error: unexpected input in "_"
_V1<-1:10
Error: unexpected input in "_"
_1_var <-1:10
Error: unexpected input in "_"
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