我需要你的帮助。我是R的新手，我有一个csv文件shorturl.at/chDK9，带有来自尼日利亚证券交易所的“所有股票指数”，格式为矩阵，月份为行，年份为列（请参见下面的屏幕截图）。我正在尝试将类从数据帧转换为xts class
它看起来像一个时间序列，但是当我用]检查班级时>
class(ASI_conv_to_USD_2003_2018) # [1] "spec_tbl_df" "tbl_df" "tbl" "data.frame"我尝试使用
ASI <- as.xts(ASI_conv_to_USD_2003_2018) # Error in as.POSIXlt.character(x, tz, ...) : # character string is not in a standard unambiguous format我也尝试过
ASI <- read.zoo(ASI_conv_to_USD_2003_2018,sep=",",FUN=as.yearmon)但是数据只是混乱！我在做什么错？
任何帮助将不胜感激。
数据：
Year,January,February,March,April,May,June,July,August,September,October,November,December
2003,104.904946,108.036674,106.6532671,106.1211644,110.6369777,114.3109402,109.7382693,120.7042254,129.0513061,141.9747008,140.2999274,147.4647619
2004,168.4931751,184.3675093,171.8948949,194.2243976,209.6846881,218.4302457,204.5201028,179.6591854,171.788925,176.3957704,175.7856172,180.1624481
2005,174.3600786,165.874575,156.2704949,165.9616111,162.3373385,162.9130468,165.5409489,177.6973735,190.975969,200.5254592,189.5253288,187.4381323
2006,184.2754864,187.0039216,184.1151874,183.9374803,195.3248086,207.753217,220.2425152,261.5902624,257.3486166,257.9713924,257.9644269,262.3660079
2007,290.763576,321.9563671,344.0977116,373.70341,397.1224052,408.8450816,422.9554882,404.1068702,405.3995157,413.592025,462.4500768,498.6259673
2008,465.9093801,564.6059512,542.1712123,511.539673,507.3090565,481.7790407,457.4977173,411.7628813,398.2089436,312.9651073,284.4105236,240.5413384
2009,151.4739254,160.8334365,136.7210055,147.8068088,203.1480164,183.6687179,169.4245226,152.975866,150.2860646,146.6946313,142.143901,141.1054878
2010,152.3225241,155.1887111,175.6850474,178.6050908,176.5795117,171.5144595,174.5049291,163.103972,154.3394041,169.2037838,167.046543,166.6141118
2011,179.0501835,173.3762495,163.0327771,164.2939247,168.9634855,165.1146804,158.8889704,141.5247531,132.2063595,139.799399,128.3830306,132.7185019
2012,133.3492814,129.4949163,132.8047714,142.0467784,142.1346216,138.9576042,148.4574482,152.9350934,167.5144256,170.2584385,170.6456267,180.8386037
2013,205.1867431,213.04438,216.0144928,215.3981965,243.4601263,232.9424155,244.1989566,233.469857,235.6526892,242.2584675,250.74636,266.2963273
2014,261.3308857,254.8076651,249.6006828,247.9683695,267.1803131,273.6744186,271.1943568,267.5533724,265.4434783,241.8539225,209.9881459,206.9083582
2015,176.4899701,152.4243544,161.5512468,176.6316031,174.6074809,170.307101,153.589313,151.067888,158.9094935,148.4871247,140.5468193,145.7620865
2016,121.710687,125.041883,128.7848346,127.5440712,140.7794402,104.7709381,89.631776,90.34052373,92.97916325,89.3927422,83.19668309,88.25819376
2017,85.43474979,83.04616393,83.42762792,84.35732766,96.74749098,108.4396857,120.8084876,116.2751597,116.1014906,120.1450704,124.20491,125.1822913
2018,145.2937418,141.8812705,136.0134688,135.2162844,124.7488623,125.4006552,121.2306533,114.014232,107.1321563,106.06426,100.7971596,102.5464927
我需要你的帮助。我是R的新手，我有一个csv文件shorturl.at/chDK9，带有来自尼日利亚证券交易所的“所有股票指数”，格式为矩阵，月份为行，年份为...
这里可能是一种出路，收集数据（即，将数据从宽变长），创建日期变量，然后将结果转换为xts。