谢妖！

看样子你的目的是把sp500在wiki上面的信息下载下来咯。

第一步：

我的运行结果

咱们先来看你的sp500.components()这个函数的主体：

function()

{

url = 'http://en.wikipedia.org/wiki/List_of_S%26P_500_companies'

txt = join(readLines(url))

temp = extract.table.from.webpage(txt, 'Ticker', has.header = T)

tickers = temp[, 'Ticker symbol']

sector = temp[, 'GICS Sector']

return(list(tickers=tickers, sector=sector))

}可以看到中利用readLines函数读取了相应的wiki页面，在我的运行中发现，会出现无法链接的情况，

Error in file(con, "r") : cannot open the connection其实我们发现wiki现在已经改为https链接了，所以做相应的修正

function()

{

url = 'https://en.wikipedia.org/wiki/List_of_S%26P_500_companies'

txt = join(readLines(url))

temp = extract.table.from.webpage(txt, 'Ticker', has.header = T)

tickers = temp[, 'Ticker symbol']

sector = temp[, 'GICS Sector']

return(list(tickers=tickers, sector=sector))

}然后就可以得到正确的标普500的股票代码和板块信息。

第二步：

你所的错误我倒是没发现

Error in temp[, "Ticker symbol"] : incorrect number of dimensions那我们来说说你碰到的这个问题会在什么时候出现呢？

首先，可以肯定在你运行的过程中在运行sp500.components函数的第三句;

temp = extract.table.from.webpage(txt, 'Ticker', has.header = T)的时候出错了，得到的temp并没有'Ticker symbol' 这个维度。那我们就在深入一步看看extract这个函数是干嘛的：

function(txt,marker=NA,has.header=T,end.marker=NA)

{

tryCatch({

pos1=1

if(!is.na(marker)) {

marker = spl(marker)

if(len(marker) > 0 && nchar(marker[1]) > 0)

for(i in 1:len(marker))

pos1 = regexpr(marker[i], substr(txt, pos1, nchar(txt))) + pos1

}

pos0 = tail(gregexpr('

if(pos0 == -1) pos0 = pos1

pos2 = head(gregexpr('

if(pos2 == -1) pos2 = nchar(txt)+1

temp = substr(txt, pos0, pos1 + pos2 - 2)

temp = gsub(pattern = '
', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '', replacement = ';row;', temp, perl = TRUE)

temp = gsub(pattern = '', replacement = ';col;', temp, perl = TRUE)

temp = gsub(pattern = '', replacement = ';col;', temp, perl = TRUE)

if(!is.na(end.marker)) {

marker = spl(end.marker)

if(len(marker) > 0 && nchar(marker[1]) > 0)

for(i in 1:len(marker))

temp = gsub(pattern = marker[i], replacement = ';row;', temp, perl = TRUE)

}

temp = gsub(pattern = '<.>', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '\r', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '\n', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '\t', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = ' ', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '&', replacement = '', temp, perl = TRUE)

temp = gsub(pattern = '»', replacement = '', temp, perl = TRUE)

temp = lapply( strsplit(temp, ';row;'), strsplit, ';col;')

n = max( sapply(temp[[1]], function(x) len(x)) )

temp = t( sapply(temp[[1]], function(x) x[1:n]) )

if(has.header) {

colnames(temp) = trim(temp[(has.header + 0), ])

temp = temp[-c(1:(has.header + 0)), ,drop=F]

}

}, error = function(ex) {

temp <

}, finally = {

return(temp)

})

}可以看到利用trycatch作为错误捕捉响应，如果没有成功，最后会直接将你的sp500.components函数中的第二句返回的url页面信息，也就是text变量赋值给temp，也就是这一句：

error = function(ex) {

temp <

}text变量是一个字符串数组，当然没有''Ticker symbol' 这个维度，所以会抛出错误。

综上，可能的原因在于没有正确的获取wiki页面，导致只返回了一个字符串数值，然后temp变量取值错误。

以上做了一个实例，对一个字符串数组用matrix的下标取值，得到的错误和题主一样哦。

所以可能的办法是将sp500.components函数中的url修改成为https的。

最后，可以得到一个list，里面保存了sp500成分股的相应的信息。如下

$tickers

[1] "MMM" "ABT" "ABBV" "ACN" "ATVI" "ADBE" "ADT" "AAP" "AES"

[10] "AET" "AFL" "AMG" "A" "GAS" "APD" "ARG" "AKAM" "AA"

[19] "AGN" "ALXN" "ALLE" "ADS" "ALL" "GOOGL" "GOOG" "MO" "AMZN"

[28] "AEE" "AAL" "AEP" "AXP" "AIG" "AMT" "AWK" "AMP" "ABC"

[37] "AME" "AMGN" "APH" "APC" "ADI" "AON" "APA" "AIV" "AAPL"

[46] "AMAT" "ADM" "AIZ" "T" "ADSK" "ADP" "AN" "AZO" "AVGO"

[55] "AVB" "AVY" "BHI" "BLL" "BAC" "BK" "BCR" "BXLT" "BAX"

[64] "BBT" "BDX" "BBBY" "BRK-B" "BBY" "BIIB" "BLK" "HRB" "BA"

[73] "BWA" "BXP" "BSX" "BMY" "BF-B" "CHRW" "CA" "CVC" "COG"

[82] "CPB" "COF" "CAH" "HSIC" "KMX" "CCL" "CAT" "CBG" "CBS"

[91] "CELG" "CNC" "CNP" "CTL" "CERN" "CF" "SCHW" "CHK" "CVX"

[100] "CMG" "CB" "CHD" "CI" "XEC" "CINF" "CTAS" "CSCO" "C"

[109] "CTXS" "CLX" "CME" "CMS" "COH" "KO" "CCE" "CTSH" "CL"

[118] "CPGX" "CMCSA" "CMA" "CAG" "CXO" "COP" "ED" "STZ" "GLW"

[127] "COST" "CCI" "CSRA" "CSX" "CMI" "CVS" "DHI" "DHR" "DRI"

[136] "DVA" "DE" "DLPH" "DAL" "XRAY" "DVN" "DO" "DFS" "DISCA"

[145] "DISCK" "DG" "DLTR" "D" "DOV" "DOW" "DPS" "DTE" "DD"

[154] "DUK" "DNB" "ETFC" "EMN" "ETN" "EBAY" "ECL" "EIX" "EW"

[163] "EA" "EMC" "EMR" "ENDP" "ETR" "EOG" "EQT" "EFX" "EQIX"

[172] "EQR" "ESS" "EL" "ES" "EXC" "EXPE" "EXPD" "ESRX" "EXR"

[181] "XOM" "FFIV" "FB" "FAST" "FRT" "FDX" "FIS" "FITB" "FSLR"

[190] "FE" "FISV" "FLIR" "FLS" "FLR" "FMC" "FTI" "FL" "F"

[199] "BEN" "FCX" "FTR" "GME" "GPS" "GRMN" "GD" "GE" "GGP"

[208] "GIS" "GM" "GPC" "GILD" "GS" "GT" "GWW" "HAL" "HBI"

[217] "HOG" "HAR" "HRS" "HIG" "HAS" "HCA" "HCP" "HP" "HES"

[226] "HPE" "HOLX" "HD" "HON" "HRL" "HST" "HPQ" "HUM" "HBAN"

[235] "ITW" "ILMN" "IR" "INTC" "ICE" "IBM" "IP" "IPG" "IFF"

[244] "INTU" "ISRG" "IVZ" "IRM" "JEC" "JBHT" "JNJ" "JCI" "JPM"

[253] "JNPR" "KSU" "K" "KEY" "KMB" "KIM" "KMI" "KLAC" "KSS"

[262] "KHC" "KR" "LB" "LLL" "LH" "LRCX" "LM" "LEG" "LEN"

[271] "LVLT" "LUK" "LLY" "LNC" "LLTC" "LMT" "L" "LOW" "LYB"

[280] "MTB" "MAC" "M" "MNK" "MRO" "MPC" "MAR" "MMC" "MLM"

[289] "MAS" "MA" "MAT" "MKC" "MCD" "MHFI" "MCK" "MJN" "WRK"

[298] "MDT" "MRK" "MET" "KORS" "MCHP" "MU" "MSFT" "MHK" "TAP"

[307] "MDLZ" "MON" "MNST" "MCO" "MS" "MOS" "MSI" "MUR" "MYL"

[316] "NDAQ" "NOV" "NAVI" "NTAP" "NFLX" "NWL" "NFX" "NEM" "NWSA"

[325] "NWS" "NEE" "NLSN" "NKE" "NI" "NBL" "JWN" "NSC" "NTRS"

[334] "NOC" "NRG" "NUE" "NVDA" "ORLY" "OXY" "OMC" "OKE" "ORCL"

[343] "OI" "PCAR" "PH" "PDCO" "PAYX" "PYPL" "PNR" "PBCT" "PEP"

[352] "PKI" "PRGO" "PFE" "PCG" "PM" "PSX" "PNW" "PXD" "PBI"

[361] "PNC" "RL" "PPG" "PPL" "PX" "CFG" "PCLN" "PFG" "PG"

[370] "PGR" "PLD" "PRU" "PEG" "PSA" "PHM" "PVH" "QRVO" "PWR"

[379] "QCOM" "DGX" "RRC" "RTN" "O" "RHT" "REGN" "RF" "RSG"

[388] "RAI" "RHI" "ROK" "COL" "ROP" "ROST" "RCL" "R" "CRM"

[397] "SNDK" "SCG" "SLB" "SNI" "STX" "SEE" "SRE" "SHW" "SIG"

[406] "SPG" "SWKS" "SLG" "SJM" "SNA" "SO" "LUV" "SWN" "SE"

[415] "STJ" "SWK" "SPLS" "SBUX" "HOT" "STT" "SRCL" "SYK" "STI"

[424] "SYMC" "SYF" "SYY" "TROW" "TGT" "TEL" "TE" "TGNA" "THC"

[433] "TDC" "TSO" "TXN" "TXT" "HSY" "TRV" "TMO" "TIF" "TWX"

[442] "TWC" "TJX" "TMK" "TSS" "TSCO" "RIG" "TRIP" "FOXA" "FOX"

[451] "TSN" "TYC" "UDR" "USB" "UA" "UNP" "UAL" "UNH" "UPS"

[460] "URI" "UTX" "UHS" "UNM" "URBN" "VFC" "VLO" "VAR" "VTR"

[469] "VRSN" "VRSK" "VZ" "VRTX" "VIAB" "V" "VNO" "VMC" "WMT"

[478] "WBA" "DIS" "WM" "WAT" "ANTM" "WFC" "HCN" "WDC" "WU"

[487] "WY" "WHR" "WFM" "WMB" "WLTW" "WEC" "WYN" "WYNN" "XEL"

[496] "XRX" "XLNX" "XL" "XYL" "YHOO" "YUM" "ZBH" "ZION" "ZTS"

$sector

[1] "Industrials" "Health Care"

[3] "Health Care" "Information Technology"

[5] "Information Technology" "Information Technology"

[7] "Industrials" "Consumer Discretionary"

[9] "Utilities" "Health Care"

[11] "Financials" "Financials"

[13] "Health Care" "Utilities"

[15] "Materials" "Materials"

[17] "Information Technology" "Materials"

[19] "Health Care" "Health Care"

[21] "Industrials" "Information Technology"

[23] "Financials" "Information Technology"

[25] "Information Technology" "Consumer Staples"

[27] "Consumer Discretionary" "Utilities"

[29] "Industrials" "Utilities"

[31] "Financials" "Financials"

[33] "Financials" "Utilities"

[35] "Financials" "Health Care"

[37] "Industrials" "Health Care"

[39] "Industrials" "Energy"

[41] "Information Technology" "Financials"

[43] "Energy" "Financials"

[45] "Information Technology" "Information Technology"

[47] "Consumer Staples" "Financials"

[49] "Telecommunications Services" "Information Technology"

[51] "Information Technology" "Consumer Discretionary"

[53] "Consumer Discretionary" "Information Technology"

[55] "Financials" "Materials"

[57] "Energy" "Materials"

[59] "Financials" "Financials"

[61] "Health Care" "Health Care"

[63] "Health Care" "Financials"

[65] "Health Care" "Consumer Discretionary"

[67] "Financials" "Consumer Discretionary"

[69] "Health Care" "Financials"

[71] "Financials" "Industrials"

[73] "Consumer Discretionary" "Financials"

[75] "Health Care" "Health Care"

[77] "Consumer Staples" "Industrials"

[79] "Information Technology" "Consumer Discretionary"

[81] "Energy" "Consumer Staples"

[83] "Financials" "Health Care"

[85] "Health Care" "Consumer Discretionary"

[87] "Consumer Discretionary" "Industrials"

[89] "Financials" "Consumer Discretionary"

[91] "Health Care" "Health Care"

[93] "Utilities" "Telecommunications Services"

[95] "Health Care" "Materials"

[97] "Financials" "Energy"

[99] "Energy" "Consumer Discretionary"

[101] "Financials" "Consumer Staples"

[103] "Health Care" "Energy"

[105] "Financials" "Industrials"

[107] "Information Technology" "Financials"

[109] "Information Technology" "Consumer Staples"

[111] "Financials" "Utilities"

[113] "Consumer Discretionary" "Consumer Staples"

[115] "Consumer Staples" "Information Technology"

[117] "Consumer Staples" "Energy"

[119] "Consumer Discretionary" "Financials"

[121] "Consumer Staples" "Energy"

[123] "Energy" "Utilities"

[125] "Consumer Staples" "Industrials"

[127] "Consumer Staples" "Financials"

[129] "Information Technology" "Industrials"

[131] "Industrials" "Consumer Staples"

[133] "Consumer Discretionary" "Industrials"

[135] "Consumer Discretionary" "Health Care"

[137] "Industrials" "Consumer Discretionary"

[139] "Industrials" "Health Care"

[141] "Energy" "Energy"

[143] "Financials" "Consumer Discretionary"

[145] "Consumer Discretionary" "Consumer Discretionary"

[147] "Consumer Discretionary" "Utilities"

[149] "Industrials" "Materials"

[151] "Consumer Staples" "Utilities"

[153] "Materials" "Utilities"

[155] "Industrials" "Financials"

[157] "Materials" "Industrials"

[159] "Information Technology" "Materials"

[161] "Utilities" "Health Care"

[163] "Information Technology" "Information Technology"

[165] "Industrials" "Health Care"

[167] "Utilities" "Energy"

[169] "Energy" "Financials"

[171] "Information Technology" "Financials"

[173] "Financials" "Consumer Staples"

[175] "Utilities" "Utilities"

[177] "Consumer Discretionary" "Industrials"

[179] "Health Care" "Financials"

[181] "Energy" "Information Technology"

[183] "Information Technology" "Industrials"

[185] "Financials" "Industrials"

[187] "Information Technology" "Financials"

[189] "Information Technology" "Utilities"

[191] "Information Technology" "Industrials"

[193] "Industrials" "Industrials"

[195] "Materials" "Energy"

[197] "Consumer Discretionary" "Consumer Discretionary"

[199] "Financials" "Materials"

[201] "Telecommunications Services" "Consumer Discretionary"

[203] "Consumer Discretionary" "Consumer Discretionary"

[205] "Industrials" "Industrials"

[207] "Financials" "Consumer Staples"

[209] "Consumer Discretionary" "Consumer Discretionary"

[211] "Health Care" "Financials"

[213] "Consumer Discretionary" "Industrials"

[215] "Energy" "Consumer Discretionary"

[217] "Consumer Discretionary" "Consumer Discretionary"

[219] "Information Technology" "Financials"

[221] "Consumer Discretionary" "Health Care"

[223] "Financials" "Energy"

[225] "Energy" "Information Technology"

[227] "Health Care" "Consumer Discretionary"

[229] "Industrials" "Consumer Staples"

[231] "Financials" "Information Technology"

[233] "Health Care" "Financials"

[235] "Industrials" "Health Care"

[237] "Industrials" "Information Technology"

[239] "Financials" "Information Technology"

[241] "Materials" "Consumer Discretionary"

[243] "Materials" "Information Technology"

[245] "Health Care" "Financials"

[247] "Industrials" "Industrials"

[249] "Industrials" "Health Care"

[251] "Consumer Discretionary" "Financials"

[253] "Information Technology" "Industrials"

[255] "Consumer Staples" "Financials"

[257] "Consumer Staples" "Financials"

[259] "Energy" "Information Technology"

[261] "Consumer Discretionary" "Consumer Staples"

[263] "Consumer Staples" "Consumer Discretionary"

[265] "Industrials" "Health Care"

[267] "Information Technology" "Financials"

[269] "Industrials" "Consumer Discretionary"

[271] "Telecommunications Services" "Financials"

[273] "Health Care" "Financials"

[275] "Information Technology" "Industrials"

[277] "Financials" "Consumer Discretionary"

[279] "Materials" "Financials"

[281] "Financials" "Consumer Discretionary"

[283] "Health Care" "Energy"

[285] "Energy" "Consumer Discretionary"

[287] "Financials" "Materials"

[289] "Industrials" "Information Technology"

[291] "Consumer Discretionary" "Consumer Staples"

[293] "Consumer Discretionary" "Financials"

[295] "Health Care" "Consumer Staples"

[297] "Materials" "Health Care"

[299] "Health Care" "Financials"

[301] "Consumer Discretionary" "Information Technology"

[303] "Information Technology" "Information Technology"

[305] "Consumer Discretionary" "Consumer Staples"

[307] "Consumer Staples" "Materials"

[309] "Consumer Staples" "Financials"

[311] "Financials" "Materials"

[313] "Information Technology" "Energy"

[315] "Health Care" "Financials"

[317] "Energy" "Financials"

[319] "Information Technology" "Information Technology"

[321] "Consumer Discretionary" "Energy"

[323] "Materials" "Consumer Discretionary"

[325] "Consumer Discretionary" "Utilities"

[327] "Industrials" "Consumer Discretionary"

[329] "Utilities" "Energy"

[331] "Consumer Discretionary" "Industrials"

[333] "Financials" "Industrials"

[335] "Utilities" "Materials"

[337] "Information Technology" "Consumer Discretionary"

[339] "Energy" "Consumer Discretionary"

[341] "Energy" "Information Technology"

[343] "Materials" "Industrials"

[345] "Industrials" "Health Care"

[347] "Information Technology" "Information Technology"

[349] "Industrials" "Financials"

[351] "Consumer Staples" "Health Care"

[353] "Health Care" "Health Care"

[355] "Utilities" "Consumer Staples"

[357] "Energy" "Utilities"

[359] "Energy" "Industrials"

[361] "Financials" "Consumer Discretionary"

[363] "Materials" "Utilities"

[365] "Materials" "Financials"

[367] "Consumer Discretionary" "Financials"

[369] "Consumer Staples" "Financials"

[371] "Financials" "Financials"

[373] "Utilities" "Financials"

[375] "Consumer Discretionary" "Consumer Discretionary"

[377] "Information Technology" "Industrials"

[379] "Information Technology" "Health Care"

[381] "Energy" "Industrials"

[383] "Financials" "Information Technology"

[385] "Health Care" "Financials"

[387] "Industrials" "Consumer Staples"

[389] "Industrials" "Industrials"

[391] "Industrials" "Industrials"

[393] "Consumer Discretionary" "Consumer Discretionary"

[395] "Industrials" "Information Technology"

[397] "Information Technology" "Utilities"

[399] "Energy" "Consumer Discretionary"

[401] "Information Technology" "Materials"

[403] "Utilities" "Materials"

[405] "Consumer Discretionary" "Financials"

[407] "Information Technology" "Financials"

[409] "Consumer Staples" "Consumer Discretionary"

[411] "Utilities" "Industrials"

[413] "Energy" "Energy"

[415] "Health Care" "Consumer Discretionary"

[417] "Consumer Discretionary" "Consumer Discretionary"

[419] "Consumer Discretionary" "Financials"

[421] "Industrials" "Health Care"

[423] "Financials" "Information Technology"

[425] "Financials" "Consumer Staples"

[427] "Financials" "Consumer Discretionary"

[429] "Information Technology" "Utilities"

[431] "Consumer Discretionary" "Health Care"

[433] "Information Technology" "Energy"

[435] "Information Technology" "Industrials"

[437] "Consumer Staples" "Financials"

[439] "Health Care" "Consumer Discretionary"

[441] "Consumer Discretionary" "Consumer Discretionary"

[443] "Consumer Discretionary" "Financials"

[445] "Information Technology" "Consumer Discretionary"

[447] "Energy" "Consumer Discretionary"

[449] "Consumer Discretionary" "Consumer Discretionary"

[451] "Consumer Staples" "Industrials"

[453] "Financials" "Financials"

[455] "Consumer Discretionary" "Industrials"

[457] "Industrials" "Health Care"

[459] "Industrials" "Industrials"

[461] "Industrials" "Health Care"

[463] "Financials" "Consumer Discretionary"

[465] "Consumer Discretionary" "Energy"

[467] "Health Care" "Financials"

[469] "Information Technology" "Industrials"

[471] "Telecommunications Services" "Health Care"

[473] "Consumer Discretionary" "Information Technology"

[475] "Financials" "Materials"

[477] "Consumer Staples" "Consumer Staples"

[479] "Consumer Discretionary" "Industrials"

[481] "Health Care" "Health Care"

[483] "Financials" "Financials"

[485] "Information Technology" "Information Technology"

[487] "Financials" "Consumer Discretionary"

[489] "Consumer Staples" "Energy"

[491] "Financials" "Utilities"

[493] "Consumer Discretionary" "Consumer Discretionary"

[495] "Utilities" "Information Technology"

[497] "Information Technology" "Financials"

[499] "Industrials" "Information Technology"

[501] "Consumer Discretionary" "Health Care"

[503] "Financials" "Health Care"

为什么sp500现在是504只股票呢？

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