seq.POSIXt(base)
seq.POSIXt()所属R语言包：base
Generate Regular Sequences of Times
生成定期时代序列
译者：生物统计家园网 机器人LoveR
描述----------Description----------
The method for seq for date-time classes.
seq日期时间类的方法。
用法----------Usage----------
## S3 method for class 'POSIXt'
seq(from, to, by, length.out = NULL, along.with = NULL, ...)
参数----------Arguments----------
参数：from
starting date. Required.
起始日期。必需的。
参数：to
end date. Optional.
结束日期。可选的。
参数：by
increment of the sequence. Optional. See "Details".
增量的序列。可选的。见“详细资料”。
参数：length.out
integer, optional. Desired length of the sequence.
整数，可选。所需序列的长度。
参数：along.with
take the length from the length of this argument.
从这一论点的长度的长度。
参数：...
arguments passed to or from other methods.
参数传递或其他方法。
Details
详情----------Details----------
by can be specified in several ways.
by可以指定在几个方面。
A number, taken to be in seconds.
一个数字，是在几秒钟内。
A object of class difftime
一个对象的类difftime
A character string, containing one of "sec", "min", "hour", "day", "DSTday", "week", "month" or "year". This can optionally be preceded by a (positive or negative) integer and a space, or followed by "s".
一个字符串，包含"sec"之一，"min"，"hour"，"day"，"DSTday"，"week"，"month"或 "year"。这可以选择之前（正或负）整数和一个空间，或"s"。
The difference between "day" and "DSTday" is that the former ignores changes to/from daylight savings time and the latter takes the same clock time each day. ("week" ignores DST (it is a period of 144 hours), but "7 DSTdays") can be used as an alternative. "month" and "year" allow for DST.)
之间的区别"day"和"DSTday"是前者忽略夏令时更改/，而后者则需要每天在相同的时钟时间。 （"week"忽略夏令时（这是一段时间144小时），但可以作为一种替代使用"7 DSTdays"）。 "month"和"year"允许夏令时。）
The timezone of the result is taken from from: remember that GMT means UTC (and not the timezone of Greenwich, England) and so does not have daylight savings time.
取自from：记得时间的手段UTC（而不是英国格林威治时区），所以没有日光节约时间的时区。
Using "month" first advances the month without changing the day: if this results in an invalid day of the month, it is counted forward into the next month: see the examples.
一天不改变"month"每月的第一个进步：如果这个结果在本月的无效一天，它被计入下个月提出：见的例子。
值----------Value----------
A vector of class "POSIXct".
一类"POSIXct"向量。
参见----------See Also----------
DateTimeClasses
DateTimeClasses
举例----------Examples----------
## first days of years[＃年的第一天]
seq(ISOdate(1910,1,1), ISOdate(1999,1,1), "years")
## by month[＃月份]
seq(ISOdate(2000,1,1), by = "month", length.out = 12)
seq(ISOdate(2000,1,31), by = "month", length.out = 4)
## quarters[＃宿舍]
seq(ISOdate(1990,1,1), ISOdate(2000,1,1), by = "3 months")
## days vs DSTdays: use c() to lose the timezone.[天vs DSTdays：使用c（）失去的时区。]
seq(c(ISOdate(2000,3,20)), by = "day", length.out = 10)
seq(c(ISOdate(2000,3,20)), by = "DSTday", length.out = 10)
seq(c(ISOdate(2000,3,20)), by = "7 DSTdays", length.out = 4)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-2-16 18:42:59
