将ts对象转换为data.frame

Question

我想将ts对象转换为data.frame对象。我的MWE如下：

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代码

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set.seed(12345)
dat <- ts(data=runif(n=10, min=50, max=100), frequency = 4, start = c(1959, 2))
library(reshape2)
df <- data.frame(date=as.Date(index(dat)), Y = melt(dat)$value)

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输出

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         date        Y
1  1975-05-14 86.04519
2  1975-05-14 93.78866
3  1975-05-14 88.04912
4  1975-05-15 94.30623
5  1975-05-15 72.82405
6  1975-05-15 58.31859
7  1975-05-15 66.25477
8  1975-05-16 75.46122
9  1975-05-16 86.38526
10 1975-05-16 99.48685

我在日期栏中丢失了我的宿舍。如果您能帮助解决问题，我将非常感谢。提前谢谢。

Answer 1

怎么样

data.frame(Y=as.matrix(dat), date=time(dat))

返回

          Y    date
1  86.04519 1959.25
2  93.78866 1959.50
3  88.04912 1959.75
4  94.30623 1960.00
5  72.82405 1960.25
6  58.31859 1960.50
7  66.25477 1960.75
8  75.46122 1961.00
9  86.38526 1961.25
10 99.48685 1961.50

Answer 2

zoo（来自Date）允许创建> dat <- ts(data=runif(n=10, min=50, max=100), frequency = 4, start = c(1959, 2)) > data.frame(Y=as.matrix(dat), date=as.Date(as.yearmon(time(dat)))) Y date 1 51.72677 1959-04-01 2 57.61867 1959-07-01 3 86.78425 1959-10-01 4 50.05683 1960-01-01 5 69.56017 1960-04-01 6 73.12473 1960-07-01 7 69.40720 1960-10-01 8 70.12426 1961-01-01 9 58.94818 1961-04-01 10 97.58294 1961-07-01 个对象。

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Answer 3

包timetk有几个转换函数。在你的情况下：

interface Constructor<M> {
  new (...args: any[]): M
}

class Base {
  static foo<T extends Base>(this: Constructor<T>): T {
    return new this()
  }
}

class Subclass extends Base {
  readonly bar = 1
}

// Prove we have a Subclass instance by invoking a subclass-specific method:
Subclass.foo().bar

Answer 4

似乎从xts对象进行转换似乎既可靠又有据可查。下面的方法在date / yearqtr类中具有新的date列。

library(xts)
datx <- as.xts(dat)
df   <- data.frame(date=index(datx), coredata(datx))

检查date的班级：

class(df$date)
[1] "yearqtr"

结果：

print(df)

  date coredata.datx.
1  1959 Q2       86.04519
2  1959 Q3       93.78866
3  1959 Q4       88.04912
4  1960 Q1       94.30623
5  1960 Q2       72.82405
6  1960 Q3       58.31859
7  1960 Q4       66.25477
8  1961 Q1       75.46122
9  1961 Q2       86.38526
10 1961 Q3       99.48685