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我想应用不同级别的数字过滤器（例如seq(10,80, by=2)），然后将它们缝合到单个数据框中，以便与另一个变量进行比较。我目前可以这样做，但我希望有更好的方法，因为我只是复制和粘贴代码，然后将所有内容重新加入。我想要的最终结果就是我所拥有的，每个过滤步骤都作为自己的列，并从 lm() 中提取斜率参数。

Source: local data frame [23 x 17]

                           File FruitNum      est10
                         <fctr>    <int>      <dbl>
1  IMG_7888.JPGcolcorrected.jpg        2 -4.0000000
2  IMG_7888.JPGcolcorrected.jpg        4 -2.0000000
3  IMG_7889.JPGcolcorrected.jpg        1 -0.8178571
4  IMG_7889.JPGcolcorrected.jpg        2 -2.1000000
5  IMG_7890.JPGcolcorrected.jpg        1 -2.8000000
6  IMG_7892.JPGcolcorrected.jpg        3 -2.3571429
7  IMG_7895.JPGcolcorrected.jpg        1 -0.4000000
8  IMG_7896.JPGcolcorrected.jpg        3 -6.5000000
9  IMG_7898.JPGcolcorrected.jpg        1 -3.0000000
10 IMG_7888.JPGcolcorrected.jpg        1         NA
..                          ...      ...        ...
Variables not shown: est15 <dbl>, est20 <dbl>, est25 <dbl>,
  est30 <dbl>, est35 <dbl>, est40 <dbl>, est45 <dbl>, est50
  <dbl>, est55 <dbl>, est60 <dbl>, est65 <dbl>, est70 <dbl>,
  est75 <dbl>, est80 <dbl>.

我目前在 hadleyverse 中使用 NSE 管道并想留在那里，但很高兴看到 base、data.table 或其他实现。我一直在看 purrr，但我不确定如何将过滤器映射到内联变量。

library(dplyr)
library(purrr)
library(tidyr)
library(broom)

cukeDataDL <- read.delim("https://gist.githubusercontent.com/bhive01/e7508f552db0415fec1749d0a390c8e5/raw/a12386d43c936c2f73d550dfdaecb8e453d19cfe/widthtest.tsv") 

cukeDatatest <-
    cukeDataDL %>%
    mutate(ObjectWidth = strsplit(as.character(cukeDatatest$ObjectWidth), ',')) %>%  # split ObjectWidth into a nested column containing a vector
    unnest() %>% # unnest nested column, melting data to long form
    mutate(ObjectWidth = as.integer(ObjectWidth)) %>%   # convert data to integer
    group_by(File, FruitNum) %>%
    mutate(rownum = row_number()) #location within File x fruit

estimate10 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.10 * max(ObjectWidth) & rownum > mean(rownum)) %>% # filtering for 10% of maxwidth and second half of fruit
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>% #broom to clean up models and get coef()s
    unnest() %>% #pull out nested information
    filter(term == "rownum") %>% #only interested in slope value
    select(File, FruitNum, est10 = estimate) #get rid of uninteresting columns and rename estimate for join

estimate15 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.15 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est15 = estimate)

estimate20 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.20 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est20 = estimate) 

estimate25 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.25 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est25 = estimate) 

estimate30 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.30 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est30 = estimate)

estimate35 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.35 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est35 = estimate)

estimate40 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.40 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est40 = estimate) 

estimate45 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.45 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est45 = estimate) 

estimate50 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.50 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est50 = estimate) 

estimate55 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.55 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est55 = estimate) 

estimate60 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.60 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est60 = estimate) 

estimate65 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.65 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est65 = estimate) 

estimate70 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.70 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est70 = estimate) 

estimate75 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.75 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est75 = estimate)
estimate80 <- 
    cukeDatatest %>% 
    filter(ObjectWidth < 0.80 * max(ObjectWidth) & rownum > mean(rownum)) %>%
    by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>%
    unnest() %>%
    filter(term == "rownum") %>%
    select(File, FruitNum, est80 = estimate) 

  # put everything together  
allEstimates <- 
    full_join(estimate10, estimate15) %>%
    full_join(., estimate20) %>%
    full_join(., estimate25) %>%
    full_join(., estimate30) %>%
    full_join(., estimate35) %>%
    full_join(., estimate40) %>%
    full_join(., estimate45) %>%
    full_join(., estimate50) %>%
    full_join(., estimate55) %>%
    full_join(., estimate60) %>%
    full_join(., estimate65) %>%
    full_join(., estimate70) %>%
    full_join(., estimate75) %>%
    full_join(., estimate80) 
allEstimates #print it out
4

1 回答 1

1

矮得多！感谢@NoamRoss 通过推特。

  1. 使用 map，您提供要迭代的系列seq(10,80, by=2)
  2. 它为每次迭代创建一系列数据框
  3. 创建名称安全的列描述以供以后用于列名
  4. 使用 bind_rows() 将所有内容放在一起
  5. 使用 spread() 使每个级别的 PCTwidth 为一列
  6. 利润？？？

``

library(dplyr)
library(purrr)
library(tidyr)
library(broom)

cukeDataDL <- read.delim("https://gist.githubusercontent.com/bhive01/e7508f552db0415fec1749d0a390c8e5/raw/a12386d43c936c2f73d550dfdaecb8e453d19cfe/widthtest.tsv")
cukeDatatest <- 
    cukeDataDL %>%
        select(File, FruitNum, ObjectWidth) %>%
        # split ObjectWidth into a nested column containing a vector
        mutate(ObjectWidth = strsplit(as.character(.$ObjectWidth), ',')) %>% 
        # unnest nested column, melting data to long form
        unnest() %>% 
        # convert data to integer
        mutate(ObjectWidth = as.integer(ObjectWidth)) %>%   # convert data to integer
        group_by(File, FruitNum) %>%
        mutate(rownum = row_number())
allEstimates <-
    map(seq(0.10,0.80, by=0.02), function(x) {
        cukeDatatest %>% 
            filter(ObjectWidth < x * max(ObjectWidth) & rownum > mean(rownum)) %>% 
            by_slice(~tidy( lm(ObjectWidth ~ rownum, data = .))) %>% 
            unnest() %>% 
            filter(term == "rownum") %>% 
            select(File, FruitNum, estimate) %>%
            mutate(PCTwidth = paste("est", round(x*100), sep=""))
        }
    ) %>% 
    bind_rows() %>%
    spread(., PCTwidth, estimate)

allEstimates #print everything out
于 2016-05-17T15:03:57.573 回答