R中的seasonplot函数不是函数，字符或符号

Question

transport<- structure(list(date = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 
8L, 9L, 10L, 11L, 12L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 
11L, 12L), .Label = c("01.01.2001", "01.02.2001", "01.03.2001", 
"01.04.2001", "01.05.2001", "01.06.2001", "01.07.2001", "01.08.2001", 
"01.09.2001", "01.10.2001", "01.11.2001", "01.12.2001"), class = "factor"), 
    Market_82 = c(7000L, 7272L, 7668L, 7869L, 8057L, 8428L, 8587L, 
    8823L, 8922L, 9178L, 9306L, 9439L, 3725L, 4883L, 8186L, 7525L, 
    6335L, 4252L, 5642L, 1326L, 8605L, 3501L, 1944L, 7332L), 
    transport = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
    1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L
    ), .Label = c("plane", "train"), class = "factor")), .Names = c("date", 
"Market_82", "transport"), class = "data.frame", row.names = c(NA, 
-24L))

让我们分别为每个组（飞机和火车）创建季节性图

library(forecast)
par(mfrow = c(2, 1))
lapply(split(transport['Market_82'], transport$transport), seasonplot(ts(transport,frequency=12)))

然后我得到了错误

Error in match.fun(FUN) : 
  'seasonplot(ts(transport, frequency = 12))' is not a function, character or symbol

如何获得两组的季候图？

Answer 1

lapply需要一个函数，括号中没有参数。如果您想将其他参数传递给函数，请在函数后列出它们，例如lapply(func, arg1, arg2)。

此外，seasonplot(ts(transport,frequency=12))会将平面和 train 数据都绘制到一个图中。

由于在您的示例中，您还想使用ts构建时间序列对象，因此最好在lapply中定义的函数中对其进行编码：

尝试：

lapply(split(transport['Market_82'], transport$transport), function(x)seasonplot(ts(x, frequency=12)))

修改

要区分哪个组对应哪个绘图，可以遍历名称：

data = split(transport['Market_82'], transport$transport)
par(mfrow = c(2, 1))
lapply(names(data), function(x)seasonplot(ts(data[[x]], frequency=12), main=x))