r - R : no applicable method for 'st_centroid' applied to an object of class "NULL" 错误-6ren

r - R : no applicable method for 'st_centroid' applied to an object of class "NULL" 错误

转载作者：行者123 更新时间：2023-12-02 01:04:48

编辑:我后来意识到错误出在我的完整数据集中，而不是代码中。我很抱歉。这可能对其他任何人有用，也可能没有用。

我有一个 tibble，有一个名为“几何”的列，它是多边形(我使用的是 sf 空间包)。我正在尝试向作为每个多边形质心的 tibble 添加一列。但是，我收到一个错误:“mutate_impl(.data, dots) 中的错误: 评估错误:'st_centroid' 没有适用的方法应用于类“NULL”的对象。”我看过其他一些关于类似主题的帖子，但不太相似，我无法弄清楚。如果我错过了什么，我道歉!

我刚开始使用管道和 tidyverse，所以可能那里出了问题。任何帮助将不胜感激!

这是我的代码示例:

center1 = function(df){ 质心 = st_centroid(df) }

表 2 = x %>% 变异(center.1 =map(几何，center1))

这是我的数据的一个非常小的样本(只有一行)——代码中的变量 x(抱歉太长了!):我有 tidyverse、tibble、dplyr、purrr 和sf 加载。

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    3510127.42029668, 3510118.45129973, 3510106.89323615, 3510092.7766459, 
    3510076.13882936, 3510057.02374876, 3510035.48191203, 3510011.57023932, 
    3509862.83959529, 3509714.12926924, 3509686.686377, 3509656.8045271, 
    3509624.56991128, 3509590.07550762, 3509553.42081239, 3509514.71155303, 
    3509474.05938321, 3509431.58156075, 3509387.40060944, 3509341.64396557, 
    3509083.0365321, 3509044.83118134, 3509032.42839277, 3508887.43995111, 
    3508809.2990829, 3508806.19313255, 3508970.12599247, 3509027.87614462, 
    3509084.60042361, 3509140.09612346, 3509880.48891173, 3509927.74213903, 
    3509973.78091383, 3510018.48002715, 3510061.71791341, 3510103.37698102, 
    3510143.34393226, 3510181.51007132, 3510217.77159996, 3510252.02989982, 
    3510690.52476793, 3510815.00951441, 3510842.18607523, 3510893.85572673, 
    3510944.90177956, 3510995.18235748, 3511044.55771178, 3511283.84077009, 
    3511333.11544703, 3511381.16374892, 3511427.84681345, 3511473.02972394, 
    3511516.58189923, 3511558.3774711, 3511598.29564798, 3511636.22106409, 
    3511672.04411285, 3511705.66126363, 3512045.00144965, 3512071.21909451, 
    3512095.79001438, 3512118.66505214, 3512377.40266854, 3512401.36828343, 
    3512423.00520283, 3512442.25709944, 3512459.07385487, 3512473.41169012, 
    3512599.54988398, 3512725.73843943, 3512816.68020058, 3512828.79024037, 
    3512838.21800158, 3512844.93764336, 3512848.93074764, 3512850.1863696, 
    3512848.70106767, 3512844.47891295, 3512837.53147809, 3512827.87780551, 
    3512815.54435526, 3512800.56493247, 3512782.9805947, 3512762.8395394, 
    3512740.1969718, 3512715.11495359, 3512687.66223286, 3512657.9140556, 
    3512625.95195949, 3512591.86355042, 3512555.74226235, 3512517.68710122, 
    3512477.80237358, 3512436.1974007, 3512392.98621891, 3512348.28726707, 
    3512302.22306188, 3512254.91986215, 3512206.50732264, 3512157.11813876, 
    3512106.88768284, 3512055.95363306, 3512004.45559611, 3511952.53472453, 
    3511900.33332983, 3511847.99449239, 3511795.66166933, 3511743.47830129, 
    3511691.58741924, 3511640.13125249, 3511589.25083882, 3511539.08563789, 
    3511489.77314905, 3511441.44853439, 3511394.24424832, 3511348.28967451, 
    3511303.71077126, 3511260.62972624, 3511219.16462159, 3511179.42911029, 
    3511141.53210462, 3511105.57747763, 3511071.66377845, 3511039.88396217, 
    3511010.32513508, 3510983.06831584, 3510958.18821352, 3510935.75302274, 
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    3510346.30180244, 3510295.28628702, 3510244.43513991, 3510193.8808925, 
    3510143.75530242, 3510094.18901006, 3510045.31119817, 3509997.2492551, 
    3509950.12844288, 3509904.07157067, 3509859.19867475, 3509815.62670561, 
    3509773.46922323, 3509732.83610104, 3509693.83323959, 3509656.56229055, 
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    3506979.62494181, 3506950.06706332, 3506922.80001327, 3506897.89823269, 
    3506875.42970528, 3506855.45577178, 3506838.03096249, 3506823.20284842, 
    3506811.01191141, 3506740.02987751, 3506730.83728866, 3506724.12978497, 
    3506719.92424862, 3506718.23126455, 3506719.05509384, 3506722.393663, 
    3506728.23856915, 3506736.5751012, 3506747.38227687, 3506760.6328955, 
    3506845.90812962, 3506931.22853819, 3506947.19258148, 3506965.61136752, 
    3506986.43687742, 3507009.61481779, 3507035.08476234, 3507180.09287715, 
    3507325.15306044, 3507470.229446, 3507497.25167022, 3507526.3283132, 
    3507557.38710731, 3507590.35085843, 3507625.13763783, 3507661.66098579, 
    3507699.83012649, 3507739.55019364, 3507780.72246622, 3507823.2446139, 
    3508081.88268562, 3508102.34172097, 3508116.84555356, 3508150.73210552, 
    3508152.30092485, 3508154.10650055, 3508021.24895246, 3507911.33513271, 
    3507523.93499175, 3506936.3127786, 3506887.04823446, 3506838.99265221, 
    3506792.28430949, 3506747.0576073, 3506703.44268329, 3506661.56503732, 
    3506621.54517028, 3506583.49823743, 3506547.53371697, 3506539.0809705, 
    3506506.08720906, 3506475.26606934, 3506446.70202996, 3506420.47338295, 
    3506396.65201922, 3506375.30323147, 3506356.48553524, 3506340.25050852, 
    3506326.64265041, 3506315.69925909, 3506307.45032963, 3506301.91847179, 
    3506299.11884799, 3506299.05913181, 3506301.73948693, 3506307.15256668, 
    3506315.28353419, 3506326.11010304, 3506339.60259835, 3506355.72403815, 
    3506374.43023467, 3506395.66991553, 3506419.38486425, 3506445.51007981, 
    3506473.97395479, 3506504.6984717, 3506537.59941677, 3506572.5866108, 
    3506609.56415632, 3506648.43070045, 3506689.0797127, 3506731.39977694, 
    3506775.27489683, 3506820.5848137, 3506867.20533623, 3506915.0086808, 
    3506963.86382177, 3507013.6368506, 3507064.19134287, 3507115.38873222, 
    3507167.08869019, 3507219.14951077, 3507271.42849888, 3507323.78236144, 
    3507376.06760015, 3507428.14090481, 3507479.85954612, 3507531.08176686, 
    3507581.66717049, 3507631.47710595, 3507680.37504765, 3507728.22696974, 
    3507767.74863639), .Dim = c(317L, 2L))), class = c("XY", 
    "POLYGON", "sfg"))), class = c("sfc_POLYGON", "sfc"), precision = 0, bbox = structure(c(-2051381.44779317, 
    3506299.05913181, -2040394.61208067, 3512850.1863696), .Names = c("xmin", 
    "ymin", "xmax", "ymax"), class = "bbox"), crs = structure(list(
        epsg = 102009L, proj4string = "+proj=lcc +lat_1=20 +lat_2=60 +lat_0=40 +lon_0=-96 +x_0=0 +y_0=0 +datum=NAD83 +units=m +no_defs"), .Names = c("epsg", 
    "proj4string"), class = "crs"), n_empty = 0L)), .Names = c("segnum", 
"system.time_start", "data", "meanSR", "cloud.pct", "id", "geometry"
), row.names = c(NA, -1L), class = c("tbl_df", "tbl", "data.frame"
))

最佳答案

您的示例在 map 中使用了 table$geometry。相反，请使用 geometry。

table2 = x %>%
  mutate(center.1 = map(geometry, center1))

关于r - R : no applicable method for 'st_centroid' applied to an object of class "NULL" 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48452914/

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r - R : no applicable method for 'st_centroid' applied to an object of class "NULL" 错误