Question

我正在使用一个包含来自不同国家的观察结果的数据框。我只想选择我确定的列表中的国家。

 Country.Name     Country.Code     Indicator.Name               Indicator.Code       year     fert
1        Aruba          ABW Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960 4.820000
2  Afghanistan          AFG Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960 7.450000
3       Angola          AGO Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960 7.478000
4      Albania          ALB Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960 6.489000
5      Andorra          AND Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960       NA
6   Arab World          ARB Fertility rate, total (births per woman) SP.DYN.TFRT.IN X1960 6.948747
.....

例如，我只需要列表c（'Aruba'，'Albania''Germany'）

我已经尝试过了，但是由于某种原因它不起作用。

d_f <- read.csv('fertility_rate.csv') %>%
  gather(year, fertility, X1960:X2017)
d_fer <- d_f[d_f$Country.Name %in% selected_countries,]

这是详细的代码：

pupil_ratio <- read.csv('pupil_ratio.csv')  #this data has all the countries I want
countries <-as.vector(pupil_ratio$Country.Name) #I convert it to a vector

d_f <- read.csv('fertility_rate.csv') %>%
  gather(year, fert, X1960:X2017)
d_fer <- d_f[d_f$Country.Name %in% countries,]

Answer 1

您好，只需按如下所示进行索引

d_fer <- d_f[(d_f$Country.Name %in% c('Aruba', 'Albania' 'Germany')),]

或

dataframe[c('Aruba', 'Albania' 'Germany'),]

希望它能工作。

Answer 2

dplyr::filter()应该可以正常工作：

d_f <- read.csv('fertility_rate.csv') %>%
  gather(year, fert, X1960:X2017) %>% 
  dplyr::filter(Country.Name %in% countries) # only select countries which are in countries

如何选择与R中的列表中的项相等的行？

2 个答案: