r - 如何从大量数据中搜索和检索特定列

Question

我有一个数据看起来像这样

df<- structure(list(X..taminn = c(86L, 102L, 34L, 35L, 53L, 54L, 43L, 
31L, 62L, 54L), X..turtia = c(413L, 322L, 525L, 535L, 247L, 207L, 
241L, 440L, 189L, 221L), X..bestt = c(82L, 102L, 6L, 2L, 46L, 
1L, 39L, 7L, 62L, 54L), Best..F1..129..test = c(3079.3, 1512.9, 
497, 2804.5, 1353.7, 1597.6, 2005.1, 186.4, 1847.5, 1558.2), 
    best..F1..130..test = c(8972.7, 1944, 2022.7, 13001.7, 2085, 
    3228.6, 4948.5, 943.6, 1329, 2655.9), best..F1..131..test = c(2634.4, 
    1181.3, 505.2, 2802.4, 1573.2, 1707.6, 1585.9, 192.1, 809.2, 
    1219), how1 = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 
    2L, 1L), .Label = c("", "High", "Not Found"), class = "factor"), 
    how2 = structure(c(2L, 2L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 1L
    ), .Label = c("", "High", "Not Found"), class = "factor"), 
    how3 = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L
    ), .Label = c("", "High"), class = "factor"), Best.test...F1..129..test = c(3079.3, 
    1512.9, 497, 2804.5, 1353.7, 1597.6, 2005.1, 186.4, 1847.5, 
    1558.2), best.test...F1..130..test = c(8972.7, 1944, 2022.7, 
    13001.7, 2085, 3228.6, 4948.5, 943.6, 1329, 2655.9), best.test...F1..131..test = c(2634.4, 
    1181.3, 505.2, 2802.4, 1573.2, 1707.6, 1585.9, 192.1, 809.2, 
    1219), Best..test..129..test = c(3079.3, 1512.9, 497, 2804.5, 
    1353.7, 1597.6, 2005.1, 186.4, 1847.5, 1558.2), best..test..130..test = c(8972.7, 
    1944, 2022.7, 13001.7, 2085, 3228.6, 4948.5, 943.6, 1329, 
    2655.9), best..test..131..test = c(2634.4, 1181.3, 505.2, 
    2802.4, 1573.2, 1707.6, 1585.9, 192.1, 809.2, 1219)), .Names = c("X..taminn", 
"X..turtia", "X..bestt", "Best..F1..129..test", "best..F1..130..test", 
"best..F1..131..test", "how1", "how2", "how3", "Best.test...F1..129..test", 
"best.test...F1..130..test", "best.test...F1..131..test", "Best..test..129..test", 
"best..test..130..test", "best..test..131..test"), class = "data.frame", row.names = c(NA, 
-10L))

基本上，我想提取所有名称以

开头的列

best..F1   
best..F2
.
.

有没有一种方法可以做到这一点而无需一个一个地访问数据并找到它的位置？

Answer 1

你可以像这样尝试 grep:

df[,grep("^best\\.\\.F",names(df))]