आर

Question

sample <- 
structure(list(GB05 = structure(c(22L, 34L, 26L, 2L), .Dim = 4L, .Dimnames = structure(list(
    c("98", "100", "102", "106")), .Names = ""), class = "table"), 
    GB18 = structure(c(8L, 14L, 70L), .Dim = 3L, .Dimnames = structure(list(
     c("173", "175", "177")), .Names = ""), class = "table"), 
    GB06 = structure(c(2L, 16L, 48L, 10L, 10L, 6L), .Dim = 6L, .Dimnames = structure(list(
     c("234", "238", "240", "242", "244", "246")), .Names = ""), class = "table"), 
    GB27 = structure(c(2L, 28L, 2L, 2L, 4L, 3L, 2L, 2L, 15L, 
    17L, 4L, 5L), .Dim = 12L, .Dimnames = structure(list(c("145", 
    "147", "149", "151", "156", "159", "165", "167", "169", "171", 
    "173", "175")), .Names = ""), class = "table"), GB24 = structure(c(2L, 
    4L, 41L, 10L, 6L, 2L, 14L, 2L, 3L), .Dim = 9L, .Dimnames = structure(list(
     c("240", "241", "242", "243", "244", "247", "249", "251", 
     "253")), .Names = ""), class = "table"), GB28 = structure(c(30L, 
    22L, 2L, 10L, 2L, 4L, 2L, 2L, 2L), .Dim = 9L, .Dimnames = structure(list(
     c("363", "364", "365", "367", "371", "377", "380", "384", 
     "390")), .Names = ""), class = "table"), GB15 = structure(c(12L, 
    16L, 43L, 2L, 3L, 4L), .Dim = 6L, .Dimnames = structure(list(
     c("142", "144", "146", "147", "148", "152")), .Names = ""), class = "table"), 
    GB02 = structure(c(6L, 78L, 4L), .Dim = 3L, .Dimnames = structure(list(
     c("194", "197", "200")), .Names = ""), class = "table"), 
    GB10 = structure(c(2L, 36L, 7L, 1L, 16L, 20L), .Dim = 6L, .Dimnames = structure(list(
     c("124", "126", "128", "130", "132", "134")), .Names = ""), class = "table"), 
    GB14 = structure(c(3L, 6L, 7L, 37L, 7L), .Dim = 5L, .Dimnames = structure(list(
     c("181", "184", "187", "193", "196")), .Names = ""), class = "table")), .Names = c("GB05", 
"GB18", "GB06", "GB27", "GB24", "GB28", "GB15", "GB02", "GB10", 
"GB14")) 

इस सूची में नामों को इस लापरवाह कॉल (प्रत्येक प्लॉट के लिए एक शीर्षक) में साजिश शीर्षक के रूप में दिखाई देने के लिए इस सूची में नाम कैसे प्राप्त करें?

dev.new() 
par(mfrow=c(2,5)) 
lapply(sample,function(x) plot(x,main=names[x])) 

मुझे समझ में नहीं आता क्यों मुख्य = नाम [x] काम नहीं करेगा। बजाय सूची आइटम के नाम पर

Answer 1

उपयोग lapply:

lapply(names(afn), function(x) plot(afn[[x]], main=x)) 

क्यों आप अपने नाम नहीं मिल रहा है देखने के लिए, lapply(afn, function(x) names(x)) चलाने आप नाम प्रत्येक के देता है सूची वस्तु या कुछ और। lapply(names(afn), function(x) x) के साथ इसे आज़माएं और अंतर की तुलना करें। फिर, याद रखें कि हम [[ का उपयोग कर नाम से एक सूची आइटम निकाल सकते हैं।