我使用以下命令导入数据集：
monthly <- read.csv2("C:/Users/adr/Desktop/dataset/Replication/monthly_2005.csv",
na.strings="NaN", stringsAsFactors=FALSE)
annual <- read.csv2("C:/Users/adr/Desktop/dataset/Replication/annual_2005.csv",
na.strings="NaN", stringsAsFactors=FALSE)
annual <- as.data.table(annual)
然后我尝试做一个简单的加法：
annual <- annual[, IndexDiv := Index + D12]
但我收到此错误：
Error in Index + D12 : non-numeric argument to binary operator
我该如何解决？
这是需要的两个变量：
> annual[,Index]
[1] "4.74" "5.07" "4.42" "4.54" "4.37" "3.58" "3.25" "3.45" "4.92" "5.84" "6.01"
[12] "5.84" "5.34" "4.34" "5.20" "5.64" "5.27" "5.14" "5.32" "4.60" "5.41" "5.51"
[23] "4.41" "4.30" "4.32" "4.22" "4.75" "5.65" "6.02" "6.87" "7.95" "8.05" "6.57"
[34] "8.25" "9.54" "9.84" "6.57" "9.03" "10.30" "9.05" "9.11" "9.38" "8.04" "7.35"
[45] "9.48" "9.80" "6.80" "7.90" "8.92" "6.81" "7.31" "8.78" "8.55" "10.16" "12.46"
[56] "13.49" "17.66" "24.35" "21.45" "15.34" "8.12" "6.89" "10.10" "9.50" "13.43" "17.18"
[67] "10.55" "13.21" "12.49" "10.58" "8.69" "9.77" "11.67" "13.28" "17.36" "15.30" "15.30"
[78] "15.20" "16.76" "20.41" "23.77" "26.57" "24.81" "35.98" "45.48" "46.67" "39.99" "55.21"
[89] "59.89" "58.11" "71.55" "63.10" "75.02" "84.75" "92.43" "80.33" "96.47" "103.86" "92.06"
[100] "92.15" "102.09" "118.05" "97.55" "68.56" "90.19" "107.46" "95.10" "96.11" "107.94" "135.76"
[111] "122.55" "140.64" "164.93" "167.24" "211.28" "242.17" "247.08" "277.72" "353.40" "330.22" "417.09"
[122] "435.71" "466.45" "459.27" "615.93" "740.74" "970.43" "1229.23" "1469.25" "1320.28" "1148.08" "879.82"
[133] "1111.92" "1211.92" "1248.29"
> annual[,D12]
[1] "0.260" "0.300" "0.330" "0.330" "0.300" "0.300" "0.190" "0.180" "0.200" "0.260" "0.320" "0.320"
[13] "0.330" "0.310" "0.240" "0.220" "0.250" "0.230" "0.220" "0.220" "0.220" "0.240" "0.250" "0.210"
[25] "0.190" "0.180" "0.180" "0.200" "0.210" "0.300" "0.320" "0.330" "0.350" "0.310" "0.330" "0.400"
[37] "0.440" "0.400" "0.440" "0.470" "0.470" "0.480" "0.480" "0.420" "0.430" "0.560" "0.690" "0.570"
[49] "0.530" "0.510" "0.460" "0.510" "0.530" "0.550" "0.600" "0.690" "0.770" "0.850" "0.970" "0.980"
[61] "0.820" "0.500" "0.440" "0.450" "0.470" "0.720" "0.800" "0.510" "0.620" "0.670" "0.710" "0.590"
[73] "0.610" "0.640" "0.660" "0.710" "0.840" "0.930" "1.140" "1.470" "1.410" "1.410" "1.450" "1.540"
[85] "1.640" "1.740" "1.790" "1.750" "1.830" "1.950" "2.020" "2.130" "2.280" "2.500" "2.720" "2.870"
[97] "2.920" "3.070" "3.160" "3.120" "3.070" "3.160" "3.400" "3.620" "3.690" "4.090" "4.710" "5.120"
[109] "5.700" "6.240" "6.650" "6.890" "7.120" "7.570" "7.940" "8.300" "8.505" "9.730" "11.050" "12.090"
[121] "12.200" "12.380" "12.580" "13.180" "13.790" "14.900" "15.490" "16.200" "16.690" "16.270" "15.740" "16.077"
[133] "17.385" "19.440" "22.220"
答案 0 :(得分：1)
您无需重新指定annual
annual[, IndexDiv := as.numeric(Index) + as.numeric(D12)]
应该工作