r语言degseq2_R语言seq()函数用法

1、seq()

用来生成一组数字的函数。

Usage：

## Default S3 method:

seq(from = 1, to = 1, by = ((to - from)/(length.out - 1)),

length.out = NULL, along.with = NULL, ...)

seq.int(from, to, by, length.out, along.with, ...)

seq_along(along.with)

seq_len(length.out)

Arguments：

... ： arguments passed to or from methods.

from, to ： the starting and (maximal) end values of the sequence. Of length 1 unless just

from ： is supplied as an unnamed argument.

by ： number: increment of the sequence.

length.out ：desired length of the sequence. A non-negative number, which for seq and

seq.int ： will be rounded up if fractional.

along.with ： take the length from the length of this argument.

Typical usages are

seq(from, to)

seq(from, to, by= )

seq(from, to, length.out= )

seq(along.with= )

seq(from)

seq(length.out= )

Examples：

seq(0, 1, length.out = 11)

seq(stats::rnorm(20)) # effectively ‘along‘

seq(1, 9, by = 2) # matches ‘end‘

seq(1, 9, by = pi) # stays below ‘end‘

seq(1, 6, by = 3)

seq(1.575, 5.125, by = 0.05)

seq(17) # same as 1:17, or even better seq_len(17)