R/ggplot 错误：对于散列来说太大
我正在使用 ggplot 绘制时间序列图，但是每当数据框的大小大于 600 左右时，ggplot 就会抛出以下错误：
anyDuplicated.default(breaks) 中的错误：长度 1136073601 太长 对于散列来说很大
，当我尝试绘制 400 个项目时，它只是给了我同样的错误。
数据像这样融化，除了有四个变量 - 速度、方向、温度和压力：
time variable value
1 2006-07-01 00:00:00 speed 4.180111
2 2006-07-02 00:00:00 speed 5.527226
3 2006-07-09 00:00:00 speed 6.650821
4 2006-07-16 00:00:00 speed 4.380063
5 2006-07-23 00:00:00 speed 5.641709
6 2006-07-30 00:00:00 speed 7.636913
7 2006-08-06 00:00:00 speed 7.128334
8 2006-08-13 00:00:00 speed 4.719046
...
201 2006-07-01 00:00:00 temp 17.140069
202 2006-07-02 00:00:00 temp 17.517480
203 2006-07-09 00:00:00 temp 14.211002
204 2006-07-16 00:00:00 temp 20.121617
205 2006-07-23 00:00:00 temp 17.933492
206 2006-07-30 00:00:00 temp 15.244583
我绘制这些的代码基于我在这里找到的内容： http://had.co.nz/ggplot2/scale_date.html
qplot(time,value,data=test3,geom="line",group=variable) +
+ facet_grid(variable ~ ., scale = "free_y")
任何指示，我将非常感激！
要将日期从字符调整为我正在使用的日期：
test$time <- strptime(test$time, format="%Y-%m-%d %H:%M:%S")
test$time <- as.POSIXct(test$time, format="%H:%M:%S")
test3 = melt(test,id="time")
class(test$time) returns "[1] "POSIXt" "POSIXct""
I'm plotting a time series graph using ggplot, however whenever the size of the data frame is greater than around 600, ggplot throws the following error:
Error in anyDuplicated.default(breaks) : length 1136073601 is too
large for hashing
In fact, it just gave me the same error when I try to plot 400 items.
The data is melted like so, except there are four variables- speed, dir, temp and pressure:
time variable value
1 2006-07-01 00:00:00 speed 4.180111
2 2006-07-02 00:00:00 speed 5.527226
3 2006-07-09 00:00:00 speed 6.650821
4 2006-07-16 00:00:00 speed 4.380063
5 2006-07-23 00:00:00 speed 5.641709
6 2006-07-30 00:00:00 speed 7.636913
7 2006-08-06 00:00:00 speed 7.128334
8 2006-08-13 00:00:00 speed 4.719046
...
201 2006-07-01 00:00:00 temp 17.140069
202 2006-07-02 00:00:00 temp 17.517480
203 2006-07-09 00:00:00 temp 14.211002
204 2006-07-16 00:00:00 temp 20.121617
205 2006-07-23 00:00:00 temp 17.933492
206 2006-07-30 00:00:00 temp 15.244583
My code to plot these is based on what I found here: http://had.co.nz/ggplot2/scale_date.html
qplot(time,value,data=test3,geom="line",group=variable) +
+ facet_grid(variable ~ ., scale = "free_y")
Any pointers and I'd be very grateful!!
To massage the date from character to date i'm using:
test$time <- strptime(test$time, format="%Y-%m-%d %H:%M:%S")
test$time <- as.POSIXct(test$time, format="%H:%M:%S")
test3 = melt(test,id="time")
class(test$time) returns "[1] "POSIXt" "POSIXct""
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尝试在对 as.POSIXct() 的调用中显式设置时区，如 https://gist.github.com/ 925852
Try setting a timezone explicitly in the call to as.POSIXct(), as in https://gist.github.com/925852