嗨,我正在尝试对数据进行子集处理以声明特定的数据帧,然后将它们转换为XTS对象。
这是我正在使用的代码。
ViewControllerResolver { viewController in
viewController.navigationItem.titleView = self.searchBar.searchController.searchBar
}
不是通过手动对所有50个州手动执行此过程,而是有一种更简单的方法通过执行以下操作来自动执行此操作吗?
library(tidyverse)
us <- read_csv(url("https://covidtracking.com/api/v1/states/daily.csv")) # pulling detailed state level data from covidtracking project website
us <- select(us, date, state, cases = positive, hosp = hospitalizedCumulative, icu = inIcuCumulative, death) # selecting columns of interest
head(us)
AK <- filter(us, state == "AK")
AK <- xts(AK[,c(-1,-2)], order.by = strptime(AK$date, format = "%Y%m%d")) %>% na.fill(0)
运行该函数不会给我带来任何帮助或错误。
答案 0 :(得分:0)
考虑//my code here
return(
<div>
{
products.map((card,index)=>{
return(
<div className="product" key={index}>
<div className="imgbox">
<img src={card.image} className="img1"></img>
</div>
<div className="specific">
<h6>{card.name}<br></br><span>{card.description}</span></h6>
<div className="price">{card.price}</div>
<label>Size</label>
<ul>
<li>20mm</li>
<li>25mm</li>
<li>30mm</li>
</ul>
<form>
<div className="form-group"><label>Quantity</label><br />
<select>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
</form>
<button className={this.state.button ? "buttonTrue": "buttonFalse"} onClick={this.handleClick}>Add to Cart</button>
</div>
</div>
)
})
}
</div>
)
}
}
(by
的面向对象包装器),它按列中的一个或多个因素对数据帧进行子集化,并且(与tapply
不同)将子集传递到已定义的方法中。 split
的返回是所有等于等于唯一因子水平的方法输出的列表。
by
答案 1 :(得分:0)
您可以尝试以下方法:
#List
List <- split(us,us$state)
#Process
process <- function(x)
{
x[is.na(x)]<-0
y <- xts::xts(x[,c(-1,-2)], order.by = strptime(x$date, format = "%Y%m%d"))
return(y)
}
List2 <- lapply(List,process)
答案 2 :(得分:0)
此方法将创建一列xts对象,这些对象是根据每个州的数据创建的。有点像group_by
和summarize
,但是输出是对象列表,而不是原子向量。我选择使用tidyverse动词进行子集设置,但也可以使用[[
。
您也可以查看tibbletime/tsibble以留在tidyverse中。另外,请查看purrr软件包,以获取有关map系列函数的更多信息。
library(tidyverse)
library(lubridate)
library(xts)
# pulling detailed state level data from covidtracking project website
us <- read_csv(url("https://covidtracking.com/api/v1/states/daily.csv")) %>%
select(date,
state,
cases = positive,
hosp = hospitalizedCumulative,
icu = inIcuCumulative,
death)
# Create a function that will take a tibble and return an XTS object
build_xts <- function(df) {
out <- xts(select(df, -c(1:2)),
order.by = pull(df, "date"))
return(out)
}
us %>%
mutate(date = strptime(date, format = "%Y%m%d")) %>%
# Create a list-column with the relevant data per state
nest(data = c(date, cases, hosp, icu, death)) %>%
# Apply the "build_xts" function to each one
mutate(time_obj = map(
.x = data,
.f = build_xts))
#> # A tibble: 56 x 3
#> state data time_obj
#> <chr> <list> <list>
#> 1 AK <tibble [124 x 5]> <xts [124 x 3]>
#> 2 AL <tibble [123 x 5]> <xts [123 x 3]>
#> 3 AR <tibble [124 x 5]> <xts [124 x 3]>
#> 4 AS <tibble [114 x 5]> <xts [114 x 3]>
#> 5 AZ <tibble [126 x 5]> <xts [126 x 3]>
#> 6 CA <tibble [126 x 5]> <xts [126 x 3]>
#> 7 CO <tibble [125 x 5]> <xts [125 x 3]>
#> 8 CT <tibble [123 x 5]> <xts [123 x 3]>
#> 9 DC <tibble [125 x 5]> <xts [125 x 3]>
#> 10 DE <tibble [124 x 5]> <xts [124 x 3]>
#> # ... with 46 more rows
由reprex package(v0.3.0)于2020-07-08创建