我需要根据来自数据框列的值更新矩阵行名称。我知道我可以更新我的矩阵行名称：
dimnames(A) = list(
+ c("row1", "row2"), # row names
+ c("col1", "col2", "col3")) # column names
然而，名称＆＃34; row1＆＃34; ，＆＃34; row2＆＃34; ...应来自具有以下值的数据框列的值：
products[,2]
[1] "Samsung UN48H6350 48\"" "Sharp LC-60LE650U 60"
[3] "Roku Streaming Stick with remote" "Samsung Galaxy Tab Pro 8.4 16GB, Wi-Fi, 8.4in - White"
[5] "GoPro Here 3 silver" "Brunswick T Zone 16 lb. bowling ball"
[7] "SDBS-150 weight set" "Aventus by Creed Eau De Parfum Spray 4 oz Men"
[9] "Sunny SF-E906" "Sabrent 4-Port USB 2.0 Hub with Individual Power Switches and LEDs (HB-UMLS)"
[11] "Magnasonic MAG-MM176K" "NETGEAR Nighthawk AC1900 (R7000)"
[13] "FIDO U2F Security Key" "Foscam FI9821W V2 white"
[15] "Samsung UN22F5000" "D&K Seamless Full Length Leggings"
[17] "Taste of the Wild Dry Dog Food, Hi Prairie Canine Formula with Roasted Bison" "Tidy Cats 4 Count Breeze Litter Pad Refill (Pack of 10)"
[19] "PetSafe 6-Volt Lithium Battery (2 Batteries per Pack)" "Hakko CHP-170 Micro Clean Cutter"
[21] "Farm Innovators CC-2 Cord Connect Water-Tight Cord Lock - Green" "Komelon SL2925 Self Lock Speed Mark"
[23] "SanDisk 32GB Ultra Class 10 Micro SDHC" "Samsung (MB-MP32DA/AM)"
[25] "Panasonic ER-GN30-K" "Ubervita W700"
[27] "Baby Einstein Take Along Tunes" "Nosefrida The Snotsucker Nasal Aspirator"
[29] "Baby Einstein Bendy Ball" "Mommy's Helper Outlet Plugs 36 Pack"
[31] "Marcy Recumbent Exercise Bike: ME-709" "Doc McStuffins Get Better Talking Mobile Cart"
[33] "Call of Duty: Advanced Warfare Day Zero Edition (PS3)" "VIZIO E320i-B2"
[35] "Peg Perego John Deere Gator XUV" "KidKraft Uptown Play Kitchen, Espresso"
[37] "Lifetime 44\" Pro Court Height-Adjustable Portable Basketball Hoop" "Canon PIXMA MG2920 printer"
[39] "Roadmaster Granite Peak 26\" Men's Mountain Bike, Black" "Zoomer Zuppies Interactive Puppy, Roxy"
[41] "Butterball Digital Electric Extra-Large Fryer" "Mongoose Dolomite Mens 7-speed"
[43] "LEGO Cuusoo Minecraft Building Set" "Hoover SteamVac F5914900"
[45] "Razor RipRider 360 Ride-On, Blue" "Cosco - Scenera Convertible Car Seat Renaissance"
[47] "Brother PE770" "RCA RTD317W"
[49] "iPads, Tablets & eBook Readers" "Televisions"
[51] "iPads, Tablets & eBook Readers" "Vacuum Cleaners"
我的问题实际上是如何提取此数据框列的值，因此它将采用以下形式：
"Samsung UN48H6350 48\"" , "Sharp LC-60LE650U 60" , "Roku Streaming Stick with remote" ...
所以我可以把这个列表作为参数传递给dimnames（A） 我试过了：
rownames(products) <- products[,2]
Error in rownames<-(*tmp*, value = c("Samsung UN48H6350 48\"", "Sharp LC-60LE650U 60", : length of 'dimnames' [1] not equal to array extent
> dput(products)
structure(list(id = 1:53, keywords = c("Samsung UN48H6350 48\"",
"Sharp LC-60LE650U 60", "Roku Streaming Stick with remote", "Samsung Galaxy Tab Pro 8.4 16GB, Wi-Fi, 8.4in - White",
"GoPro Here 3 silver", "Brunswick T Zone 16 lb. bowling ball",
"SDBS-150 weight set", "Aventus by Creed Eau De Parfum Spray 4 oz Men",
"Sunny SF-E906", "Sabrent 4-Port USB 2.0 Hub with Individual Power Switches and LEDs (HB-UMLS)",
"Magnasonic MAG-MM176K", "NETGEAR Nighthawk AC1900 (R7000)",
"FIDO U2F Security Key", "Foscam FI9821W V2 white", "Samsung UN22F5000",
"D&K Seamless Full Length Leggings", "Taste of the Wild Dry Dog Food, Hi Prairie Canine Formula with Roasted Bison",
"Tidy Cats 4 Count Breeze Litter Pad Refill (Pack of 10)", "PetSafe 6-Volt Lithium Battery (2 Batteries per Pack)",
"Hakko CHP-170 Micro Clean Cutter", "Farm Innovators CC-2 Cord Connect Water-Tight Cord Lock - Green",
"Komelon SL2925 Self Lock Speed Mark", "SanDisk 32GB Ultra Class 10 Micro SDHC",
"Samsung (MB-MP32DA/AM)", "Panasonic ER-GN30-K", "Ubervita W700",
"Baby Einstein Take Along Tunes", "Nosefrida The Snotsucker Nasal Aspirator",
"Baby Einstein Bendy Ball", "Mommy's Helper Outlet Plugs 36 Pack",
"Marcy Recumbent Exercise Bike: ME-709", "Doc McStuffins Get Better Talking Mobile Cart",
"Call of Duty: Advanced Warfare Day Zero Edition (PS3)", "VIZIO E320i-B2",
"Peg Perego John Deere Gator XUV", "KidKraft Uptown Play Kitchen, Espresso",
"Lifetime 44\" Pro Court Height-Adjustable Portable Basketball Hoop",
"Canon PIXMA MG2920 printer", "Roadmaster Granite Peak 26\" Men's Mountain Bike, Black",
"Zoomer Zuppies Interactive Puppy, Roxy", "Butterball Digital Electric Extra-Large Fryer",
"Mongoose Dolomite Mens 7-speed", "LEGO Cuusoo Minecraft Building Set",
"Hoover SteamVac F5914900", "Razor RipRider 360 Ride-On, Blue",
"Cosco - Scenera Convertible Car Seat Renaissance", "Brother PE770",
"RCA RTD317W", "iPads, Tablets & eBook Readers", "Televisions",
"iPads, Tablets & eBook Readers", "Vacuum Cleaners", "Bicycless"
), categories = c("11071", "11071", "168058", "171485", "625",
"36105", "888", "26396", "15273", NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
"171485", "11071", "171485", "20614", "20614"), buyer_postal_code = c("90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210", "90210", "90210", "90210", "90210",
"90210", "90210", "90210"), min_price = c(200, 200, 0, 0, 100,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 100, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, NA, NA, NA, NA), seller_item_id = c(NA, NA, NA, NA,
NA, NA, "111384136042", "111423002580", "191217437226", NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, "", NA, NA, NA, NA)), .Names = c("id", "keywords",
"categories", "buyer_postal_code", "min_price", "seller_item_id"
), row.names = c(NA, -53L), class = "data.frame")
答案 0 :(得分：0)
您必须首先解决重复记录的问题，因为不允许数据框具有重复的行名称。例如
49 iPads, Tablets & eBook Readers 171485 90210 0
51 iPads, Tablets & eBook Readers 171485 90210 NA <NA>
如果您想要解决此问题，则不应出现。一旦你这样做，你rownames(products) <- products[,2]的原始尝试就可以了。
如果您必须按原样使用rownames，那么矩阵 允许重复的名称：
> x <- as.matrix(products)
> rownames(x) <- x[, 2]
> head(x)
id keywords categories buyer_postal_code min_price seller_item_id
Samsung UN48H6350 48" " 1" "Samsung UN48H6350 48\"" "11071" "90210" "200" NA
Sharp LC-60LE650U 60 " 2" "Sharp LC-60LE650U 60" "11071" "90210" "200" NA
Roku Streaming Stick with remote " 3" "Roku Streaming Stick with remote" "168058" "90210" " 0" NA
Samsung Galaxy Tab Pro 8.4 16GB, Wi-Fi, 8.4in - White " 4" "Samsung Galaxy Tab Pro 8.4 16GB, Wi-Fi, 8.4in - White" "171485" "90210" " 0" NA
GoPro Here 3 silver " 5" "GoPro Here 3 silver" "625" "90210" "100" NA
Brunswick T Zone 16 lb. bowling ball " 6" "Brunswick T Zone 16 lb. bowling ball" "36105" "90210" " 0" NA