library(rvest)
Holidays <- read_html("http://www.spholidays.com/monuments.php")
a <- data.frame(Places = html_text(html_nodes(Holidays,".cat-hd1")))
b <- data.frame(Monuments_Name = html_text(html_nodes(Holidays,"tr~ tr+ tr td:nth-child(1)")))
b <- as.data.frame(b)
b<-b[!apply(b == "", 1, all),]
b<-b[!apply(b == "", 1, all),]
申请出错（b ==＆＃34;＆＃34;，1，全部）：dim（X）必须有正长度
b
[1] Taj Mahal
[3] Red Fort in Agra
[5] Fatehpur Sikri
[7] Itmad-Ud-Daula / Baby Taj
[9] Sikandara
[11] Red Fort
[13] Jama Mosque
[15] Qutab Tower
[17] Lotus Temple
[19] Jantar Mantar
[21] Akshardham Temple
[23] Birla Temple
[25] Raj Ghat
[27] India Gate
[29] President house & Mughal Garden
[31] National Rail Museum
[33] Humayun's Tomb
[35] Gandhi National Museum
[37] Chatarpur temple
[39] National Museum
[41] Gandhi Smriti
[43] Amber Fort
[45] Jaigarh Fort
[47] Nahargarh Fort
[49] Jalmahal Palace
[51] Hawa Mahal or Wind Palace
[53] Jantar Mantar
[55] City Palace
[57] Chowki Dhani - An ethnic Village
[59] Elephant Ride at Amber Fort
[61] Mahrangarh Fort
[63] Umaid Bhawan Palace
[65] Jaswant Thada
[67] Government Museum
[69] Clock Tower and Sadar Market
[71] Mahamandir Temple
[73] City Palace
[75] Lake Pichola
[77] City Palace Museum
[79] Shiilpgram Museum
[81] Fateh Sagar Lake
[83] Jaisamand Lake
[85] Rajsamand Lake
[87] Manson Palace
[89] Nagda and Eklinjgi
[91] Ranakpur
[93] Jagmandir Island
[95] Saheliyon ki bari
[97] Chttorgarh
[99] Kumbhalgarh Fort
[101] Junagarh Fort
[103] Lalgarh Palace
[105] Karni Mata Temple(Rats Temple)
[107] Camel breeding farm house
[109] Gajner Wildlife sanctury
[111] Shiv bari temple
[113] Jaisalmer Fort
[115] Nath Mal Ji ki haveli
[117] Patwon ki haveli
[119] Salim Singh ki Haveli
[121] Desert national Park
[123] Gadsisar lake
[125] Haveli Museum
[127] Jain Temples
[129] Sand Dunes
[131] Tazia Tower
[133] Taragarh Fort
[135] Adhai Din ka Jhonpara
[137] Dargah of Garib Nawaj
[139] Nasiyan Jain Temple
[141] Brahma Temple
[143] Pushkar Lake
[145] Savitri Temple
[147] Mahadeva Temple
[149] Rangji Temple
[151] Varaha Temple
[153] Pushkar Fair
[155] Ranthambore fort
[157] Ranthambore jungle safari :---
[159] Park Safari by Gypsy Sharing Basis Per Pax
[161] Park Safari by Canter per ride Per Pax
[163]
[165] Park Safari by Gypsy(Exclusive up to 04 Pax)\n\t\n\n
[167] Choice Guide For Jeep Safari
[169] Choice Guide For Canter Safari
[171] Camel Ride (Outside of the Park)
[173] For 02 pax for 01 Hour
[175]
[177] Benares Hindu University- Bharat Kala Museum
[179] Bharat Mata Temple
[181] Durga Temple
[183] Nepali Temple(Kathwala Temple)
[185] Vishwanath Temple(Golden Temple)
[187] Tulsi Manas Temple
[189] Ram Nagar Fort
[191] Sarnath
[193] Khajuraho Temples
[195] Sound & Light Show at Khajuraho
[197] Ajanta
[199] Ellora
[201] Mini Taj (Bibi ka Maqbara)
[203] Daulatabad Fort
[205] Jews Synagogue
[207] St Francis church
[209] Dutch Palace
[211] Madras Govt.Museum
[213] Madras Fort Museum
[215]
[217] Eakambareshwara Temple
[219] Kailasanatha temple
[221] Varadharaja Temple
[223] Tiruvannamalai Gingey
[225] Pondicherry Museum
[227] Tanjore Art Gallery
[229] Srirangam Temple
[231] Rockfort
[233] Madurai Palace
[235] Madurai Temple
[237] Vivekananda Rock
[239] Mysore palace
[241] Srirangapatana
[243] Belur Temple
[245] HAMPI
[247] Badami
[249] Pattadakkal
[251] Aihole
[253] Bijapur
[255] Tippu Palace
[257] Puthanmalika Palace
[259] Napier Museum & Art Gallery
[261] Sri Padmanabha temple Padmanbhapuram Palace
[263] Safari by Gypsy (Exclusive)
[265] Night Safari by Gypsy (Exclusive)
[267] Safari by Gypsy (Kanha) Premium Zone(Exclusive)
[269] Safari by Gypsy (Kishli, Sarhi & Mukki) Normal Zone Exclusive)
[271] Safari by Gypsy (Exclusive)
[273] Night Safari by Gypsy
[275] Bandhavgarh National Park:--
[277] Safari by Gypsy(From Tala Gate)Premium Zone Exclusive
[279] Safari by Gypsy (From Ghondi & Maghdi Gate) Exclusive
[281] Park Safari by Gypsy(Sitabani,Bizrani,Jhirna gate)
[283] Exclusive for 02 person
[285] Park Safari by Gypsy (Durga Devi Gate)
[287] Park Safari by Canter
[289]
[291] Elephant ride in side of the park (Sub to Availability)
[293] For 02 person for 01 hour
[295]
[297] Park Safari by Gypsy Exclusive for 02 Person
[299] Extra Person (Up to 06 person in one Jeep)
[301] Park Safari by Canter-minimum 20 pax
[303]
答案 0 :(得分：0)
我不确定我是否完全理解你的问题，但它只是删除你想要实现的空值吗？如果是这样，我认为问题是你有一些不是“”的奇怪值，因此当你试图寻找那些值时，R找不到它们。尝试这样的事情：
使用data.table包
library(rvest)
library(data.table)
Holidays <- read_html("http://www.spholidays.com/monuments.php")
a = data.table(Places = html_text(html_nodes(Holidays,".cat-hd1")))
b = data.table(Monuments_Name = html_text(html_nodes(Holidays,"tr~ tr+ tr td:nth-child(1)")))
b=b[-which(b[,Monuments_Name]==b[2,Monuments_Name] | b[,Monuments_Name]==b[281,Monuments_Name] | b[,Monuments_Name]==b[288,Monuments_Name] )]
使用data.frame
c = data.frame(Places = html_text(html_nodes(Holidays,".cat-hd1")))
d = data.frame(Monuments_Name = html_text(html_nodes(Holidays,"tr~ tr+ tr td:nth-child(1)")))
d$Monuments_Name=as.character(d$Monuments_Name)
d=data.frame(Monuments_Name=d$Monuments_Name[-which(d$Monuments_Name==d$Monuments_Name[2] | d$Monuments_Name==d$Monuments_Name[281] | d$Monuments_Name==d$Monuments_Name[288])])
它对我有用，请告诉我你是否有任何问题。