我对 R 相当陌生。我有一个从 postgres 数据库中提取的数据框，其结构如下
qc_date qc_camera qc_head qc_sensitivity
269 2012-05-04 RED 1 332
270 2012-05-04 RED 2 333
271 2012-05-10 RED 1 318
272 2012-05-10 RED 2 325
273 2012-05-10 BLUE 1 320
274 2012-05-10 BLUE 2 329
275 2012-05-15 RED 1 330
276 2012-05-15 RED 2 332
如何合并第 2 列和第 3 列以生成
qc_date qc_cam_head qc_sensitivity
269 2012-05-04 RED H1 332
270 2012-05-04 RED H2 333
271 2012-05-10 RED H1 318
272 2012-05-10 RED H2 325
273 2012-05-10 BLUE H1 320
274 2012-05-10 BLUE H2 329
275 2012-05-15 RED H1 330
276 2012-05-15 RED H2 332
我可以使用自己组合两列
cbind(paste(df_date[,2],df[,3], sep=" H"))
如何在保留其他 2 列的同时使用此“绑定功能”
structure(list(qc_date = structure(c(15464, 15464, 15470, 15470,
15470, 15470, 15475, 15475, 15481, 15481, 15481, 15481, 15490,
15490, 15490, 15490, 15504, 15504, 15504, 15504, 15512, 15512,
15512, 15512, 15519, 15519, 15519, 15519, 15525, 15525, 15525,
15525, 15531, 15531, 15531, 15531, 15538, 15538, 15539, 15539,
15548, 15548, 15548, 15548, 15554, 15554, 15554, 15554, 15561,
15561, 15561, 15561, 15561, 15567, 15567, 15567, 15567, 15567,
15567, 15576, 15576, 15576, 15576, 15580, 15580, 15580, 15580,
15587, 15587, 15587, 15587, 15595, 15595, 15595, 15595, 15601,
15601, 15601, 15601, 15601, 15609, 15609, 15609, 15609, 15614,
15614, 15614, 15614, 15621, 15621, 15621, 15621, 15628, 15628,
15628, 15628, 15628, 15638, 15638, 15638, 15638, 15645, 15645,
15645, 15645, 15649, 15649, 15651, 15651, 15656, 15656, 15656,
15656, 15663, 15663, 15664, 15664, 15671, 15671, 15671, 15671,
15678, 15678, 15678, 15678, 15684, 15684, 15685, 15685, 15692,
15692, 15692, 15692, 15692, 15692, 15701, 15701, 15701, 15701,
15705, 15705, 15713, 15713, 15716, 15716, 15719, 15719, 15719,
15719, 15728, 15728, 15728, 15728, 15733, 15733, 15733, 15733,
15741, 15741, 15741, 15741, 15741, 15747, 15747, 15747, 15749,
15749, 15754, 15754, 15754, 15754, 15762, 15762, 15762, 15762,
15762, 15768, 15768, 15768, 15768, 15768, 15777, 15777, 15778,
15778, 15789, 15789, 15790, 15790, 15799, 15799, 15799, 15799,
15804, 15804, 15804, 15804), class = "Date"), qc_camera = c("RED",
"RED", "RED", "RED", "BLUE", "BLUE", "RED", "RED", "RED", "RED",
"BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE",
"RED", "RED", "RED", "RED", "BLUE", "BLUE", "RED", "RED", "BLUE",
"BLUE", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED", "RED",
"RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED", "RED", "RED",
"BLUE", "RED", "BLUE", "RED", "BLUE", "BLUE", "BLUE", "BLUE",
"RED", "RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "BLUE",
"RED", "RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE",
"BLUE", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE",
"RED", "RED", "BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE", "BLUE",
"BLUE", "RED", "RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE",
"BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE", "RED", "RED", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED", "RED",
"RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED", "RED", "BLUE",
"BLUE", "BLUE", "RED", "RED", "RED", "RED", "RED", "BLUE", "BLUE",
"BLUE", "BLUE", "RED", "RED", "BLUE", "BLUE", "BLUE", "RED",
"RED", "BLUE", "BLUE", "RED", "RED", "RED", "BLUE", "BLUE", "RED",
"RED", "RED", "RED", "BLUE", "BLUE", "BLUE", "BLUE", "RED", "RED",
"RED", "RED", "BLUE", "BLUE"), qc_head = c(1L, 2L, 1L, 2L, 1L,
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L,
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L,
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 2L,
1L, 1L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L,
1L, 2L, 1L, 2L, 2L, 1L, 1L, 2L, 1L, 1L, 2L, 1L, 2L, 1L, 2L, 2L,
1L, 1L, 2L, 2L, 1L, 2L, 1L, 1L, 2L, 1L, 2L, 2L, 2L, 1L, 2L, 1L,
2L, 1L, 1L, 2L, 1L, 2L, 1L, 2L, 2L, 1L, 1L, 2L, 2L, 1L, 2L, 1L,
1L, 2L, 1L, 2L, 2L, 1L, 2L, 1L, 1L, 2L, 2L, 1L, 1L, 1L, 2L, 2L,
2L, 1L, 1L, 2L, 2L, 1L, 2L, 1L, 1L, 2L, 2L, 1L, 1L, 2L, 1L, 2L,
1L, 2L, 1L, 2L, 2L, 1L, 2L, 1L, 1L, 1L, 2L, 1L, 2L, 1L, 1L, 2L,
2L, 1L, 2L, 1L, 1L, 2L, 2L, 1L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 1L,
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 1L, 2L, 1L, 2L, 2L, 1L, 2L, 1L
), qc_sensitivity = c(332, 333, 318, 325, 320, 329, 330, 332,
334, 306, 319, 316, 324, 331, 330, 330, 318, 324, 323, 325, 323,
327, 322, 330, 328, 323, 332, 334, 330, 327, 330, 333, 326, 330,
326, 331, 327, 331, 325, 324, 319, 322, 323, 325, 323, 325, 318,
317, 328, 330, 325, 321, 324, 295, 330, 0, 327, 330, 329, 333,
333, 331, 326, 332, 330, 330, 331, 336, 331, 329, 330, 327, 320,
324, 320, 0, 330, 328, 324, 323, 330, 324, 332, 335, 310, 306,
304, 308, 300, 297, 336, 331, 324, 325, 339, 313, 314, 314, 317,
341, 320, 320, 320, 323, 327, 345, 346, 325, 327, 332, 331, 316,
333, 323, 321, 336, 330, 329, 333, 330, 330, 334, 328, 319, 313,
331, 328, 324, 329, 325, 324, 326, 328, 323, 326, 329, 331, 333,
330, 308, 307, 307, 300, 334, 328, 325, 334, 327, 324, 318, 320,
317, 320, 324, 321, 322, 313, 0, 289, 280, 294, 266, 340, 338,
337, 239, 238, 340, 325, 327, 330, 328, 323, 323, 325, 330, 255,
250, 254, 260, 261, 323, 305, 330, 325, 312, 310, 296, 301, 317,
311, 298, 303, 335, 348, 296, 336)), .Names = c("qc_date", "qc_camera",
"qc_head", "qc_sensitivity"), row.names = 269:465, class = "data.frame")