在 R 中的 lapply 调用中添加列表名称作为绘图标题答案

【问题标题】：Adding lists names as plot titles in lapply call in R在 R 中的 lapply 调用中添加列表名称作为绘图标题
【发布时间】：2013-02-09 16:49:16
【问题描述】：

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"))

如何在此 lapply 调用中将此列表中的名称显示为情节标题（每个情节一个标题）？

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

我不明白为什么 main=names[x] 不起作用。

【问题讨论】：

您的dput 输出未正确复制/粘贴。尝试复制时出错。
@Arun 已更正，感谢您指出这一点。
@Chargaff，不。现在已修复。你的第一行是sample <- dput(afn)。您不需要包含 dput(afn) 部分。
@A5C1D2H2I1M1N2O1R2T1 你能帮忙解决这个问题吗stackoverflow.com/questions/59344173/…

标签： r plot

【解决方案1】：

在列表项的名称上使用lapply：

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

要查看为什么你没有得到你的名字，运行lapply(afn, function(x) names(x))会给你每个列表项的名字或其他东西。尝试与lapply(names(afn), function(x) x) 相同并比较差异。然后，请记住，我们可以使用 [[ 按名称提取单个列表项。

【讨论】：