如果值与另一个df一致，如何使用r添加特定行的值？

我在这里不知所措。循环是我的弱点

我有两个数据帧，我想有条件地向其中一个添加值

这就是它们的样子： df

链接

 OID_  FROM_X  FROM_Y  NEAR_X  NEAR_Y 
0    0 2679218 1237147 2679968 1237580
1    0 2679218 1237147 2678468 1237580
2    0 2679218 1237147 2679218 1238013
3    0 2679218 1237147 2679968 1238446
4    0 2679218 1237147 2680718 1237147
5    0 2679218 1237147 2678468 1238446

structure(list(OID_ = c("0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0"), FROM_X = c(2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
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2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
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2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115), FROM_Y = c(1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
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1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329), NEAR_X = c(2679967.8101, 
2678467.83218, 2679217.82115, 2679967.8101, 2680717.79909, 2678467.83218, 
2680717.79909, 2677717.84315, 2679217.82115, 2679967.8101, 2678467.83218, 
2680717.79909, 2681467.78814, 2681467.78814, 2677717.84315, 2681467.78814, 
2679217.82115, 2676967.85411, 2680717.79909, 2677717.84315, 2682217.77719, 
2681467.78814, 2679967.8101, 2678467.83218, 2676967.85411, 2682217.77719, 
2679217.82115, 2676217.86515, 2682217.77719, 2681467.78814, 2680717.79909, 
2682967.76615, 2677717.84315, 2676967.85411, 2682967.76615, 2679967.8101, 
2678467.83218, 2682967.76615, 2676217.86515, 2682217.77719, 2682967.76615, 
2679217.82115, 2683717.75511, 2681467.78814, 2676967.85411, 2680717.79909, 
2683717.75511, 2677717.84315, 2676217.86515, 2682217.77719, 2679967.8101, 
2675467.87619, 2678467.83218, 2683717.75511, 2682967.76615, 2679217.82115, 
2683717.75511, 2681467.78814, 2676967.85411, 2676217.86515, 2684467.74415, 
2682217.77719, 2680717.79909, 2677717.84315, 2682967.76615, 2684467.74415, 
2679967.8101, 2678467.83218, 2683717.75511, 2684467.74415, 2676217.86515, 
2682217.77719, 2679217.82115, 2681467.78814, 2675467.87619, 2676967.85411, 
2682967.76615, 2684467.74415, 2685217.73318, 2680717.79909, 2677717.84315, 
2683717.75511, 2685217.73318, 2679967.8101, 2678467.83218, 2684467.74415, 
2676217.86515, 2682217.77719, 2675467.87619, 2682967.76615, 2683717.75511, 
2674717.88714, 2681467.78814, 2676967.85411, 2679217.82115, 2680717.79909, 
2677717.84315, 2679967.8101, 2678467.83218, 2675467.87619), NEAR_Y = c(1237579.74961, 
1237579.74961, 1238012.756, 1238445.7623, 1237146.74329, 1238445.7623, 
1238012.756, 1238012.756, 1238878.7687, 1239311.775, 1239311.775, 
1238878.7687, 1237579.74961, 1236713.7369, 1238878.7687, 1238445.7623, 
1239744.78139, 1238445.7623, 1239744.78139, 1239744.78139, 1237146.74329, 
1239311.775, 1240177.78772, 1240177.78772, 1239311.775, 1238012.756, 
1240610.7941, 1238878.7687, 1238878.7687, 1240177.78772, 1240610.7941, 
1237579.74961, 1240610.7941, 1240177.78772, 1236713.7369, 1241043.80042, 
1241043.80042, 1238445.7623, 1239744.78139, 1239744.78139, 1239311.775, 
1241476.80678, 1237146.74329, 1241043.80042, 1241043.80042, 1241476.80678, 
1238012.756, 1241476.80678, 1240610.7941, 1240610.7941, 1241909.81311, 
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1239744.78139, 1241909.81311, 1241909.81311, 1241476.80678, 1237579.74961, 
1241476.80678, 1242342.81941, 1242342.81941, 1241043.80042, 1238445.7623, 
1242775.82579, 1242775.82579, 1240610.7941, 1239311.775, 1242342.81941, 
1242342.81941, 1243208.83209, 1242775.82579, 1241909.81311, 1242775.82579, 
1241909.81311, 1240177.78772, 1238012.756, 1243208.83209, 1243208.83209, 
1241476.80678, 1238878.7687, 1243641.8385, 1243641.8385, 1241043.80042, 
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1242342.81941, 1243641.8385, 1243641.8385, 1244074.84491, 1244074.84491, 
1244074.84491, 1244507.85121, 1244507.85121, 1243641.8385), Shape_Leng = c(866.012589959, 
866.01267656, 866.012700003, 1499.977904, 1499.9779, 1499.977954, 
1732.02531652, 1732.02540312, 1732.0254, 2291.25415704, 2291.25418977, 
2291.25417332, 2291.25413408, 2291.25415298, 2291.25423878, 2598.03799308, 
2598.0381, 2598.03816628, 2999.9559446, 2999.9559946, 2999.956, 
3122.45309222, 3122.45312293, 3122.45314695, 3122.45323633, 3122.45320197, 
3464.0508, 3464.05080623, 3464.05080624, 3774.86174659, 3774.86180482, 
3774.86184633, 3774.86184456, 3774.8618658, 3774.8618578, 3968.56868289, 
3968.56870179, 3968.56874268, 3968.56875598, 3968.56875599, 4330.0634828, 
4330.0635, 4499.93390001, 4499.9338986, 4499.9339986, 4582.5084413, 
4582.50838526, 4582.50847403, 4582.50847756, 4582.50847756, 4821.75458415, 
4821.75462439, 4821.75459971, 4821.75456558, 4821.75462439, 5196.0761, 
5196.07612276, 5267.74951671, 5267.74960213, 5267.74960642, 5267.74961078, 
5267.74960643, 5408.24745528, 5408.24748301, 5408.2475483, 5408.24757832, 
5678.82497899, 5678.82499219, 5678.82497084, 5678.82503411, 5999.9119026, 
5999.9119026, 6062.0888, 6062.08881847, 6062.08886628, 6062.08889269, 
6062.08886629, 6062.08888592, 6062.08891426, 6244.90626988, 6244.9062939, 
6244.90632584, 6244.90640395, 6538.25244291, 6538.25245438, 6538.25248417, 
6763.77532308, 6763.77532308, 6763.77537289, 6763.77537289, 6873.76257529, 
6873.76270622, 6873.76263106, 6873.76269653, 6928.1016, 7088.61943403, 
7088.61945519, 7399.2156926, 7399.21570273, 7499.8899432), ID = c(NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
NA, NA, NA)), row.names = 0:99, class = "data.frame")

和df

centroid

  FID_   GRID_ID       x       y  ID 
1    0   DD-122  2679218 1237147  1
2    1   DF-122  2680718 1237147  2
3    2   DG-122  2681468 1236714  3
4    3   DH-122  2682218 1237147  4
5    4   DI-122  2682968 1236714  5
6    5   DJ-122  2683718 1237147  6

因此，我们的想法是将

质心

df的

ID

添加到

链接

df。因此，

链接中的一行需要满足以下条件：
links$FROM\ux==centroid$X&links$FROM\uy==centroid$Y

如果有人能帮我，我会很高兴的。我真的不知道如何开始这样的循环

以下是一些需要尝试的数据：
链接

 OID_  FROM_X  FROM_Y  NEAR_X  NEAR_Y 
0    0 2679218 1237147 2679968 1237580
1    0 2679218 1237147 2678468 1237580
2    0 2679218 1237147 2679218 1238013
3    0 2679218 1237147 2679968 1238446
4    0 2679218 1237147 2680718 1237147
5    0 2679218 1237147 2678468 1238446

structure(list(OID_ = c("0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", 
"0"), FROM_X = c(2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
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2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 2679217.82115, 
2679217.82115, 2679217.82115), FROM_Y = c(1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
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1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 1237146.74329, 
1237146.74329, 1237146.74329, 1237146.74329), NEAR_X = c(2679967.8101, 
2678467.83218, 2679217.82115, 2679967.8101, 2680717.79909, 2678467.83218, 
2680717.79909, 2677717.84315, 2679217.82115, 2679967.8101, 2678467.83218, 
2680717.79909, 2681467.78814, 2681467.78814, 2677717.84315, 2681467.78814, 
2679217.82115, 2676967.85411, 2680717.79909, 2677717.84315, 2682217.77719, 
2681467.78814, 2679967.8101, 2678467.83218, 2676967.85411, 2682217.77719, 
2679217.82115, 2676217.86515, 2682217.77719, 2681467.78814, 2680717.79909, 
2682967.76615, 2677717.84315, 2676967.85411, 2682967.76615, 2679967.8101, 
2678467.83218, 2682967.76615, 2676217.86515, 2682217.77719, 2682967.76615, 
2679217.82115, 2683717.75511, 2681467.78814, 2676967.85411, 2680717.79909, 
2683717.75511, 2677717.84315, 2676217.86515, 2682217.77719, 2679967.8101, 
2675467.87619, 2678467.83218, 2683717.75511, 2682967.76615, 2679217.82115, 
2683717.75511, 2681467.78814, 2676967.85411, 2676217.86515, 2684467.74415, 
2682217.77719, 2680717.79909, 2677717.84315, 2682967.76615, 2684467.74415, 
2679967.8101, 2678467.83218, 2683717.75511, 2684467.74415, 2676217.86515, 
2682217.77719, 2679217.82115, 2681467.78814, 2675467.87619, 2676967.85411, 
2682967.76615, 2684467.74415, 2685217.73318, 2680717.79909, 2677717.84315, 
2683717.75511, 2685217.73318, 2679967.8101, 2678467.83218, 2684467.74415, 
2676217.86515, 2682217.77719, 2675467.87619, 2682967.76615, 2683717.75511, 
2674717.88714, 2681467.78814, 2676967.85411, 2679217.82115, 2680717.79909, 
2677717.84315, 2679967.8101, 2678467.83218, 2675467.87619), NEAR_Y = c(1237579.74961, 
1237579.74961, 1238012.756, 1238445.7623, 1237146.74329, 1238445.7623, 
1238012.756, 1238012.756, 1238878.7687, 1239311.775, 1239311.775, 
1238878.7687, 1237579.74961, 1236713.7369, 1238878.7687, 1238445.7623, 
1239744.78139, 1238445.7623, 1239744.78139, 1239744.78139, 1237146.74329, 
1239311.775, 1240177.78772, 1240177.78772, 1239311.775, 1238012.756, 
1240610.7941, 1238878.7687, 1238878.7687, 1240177.78772, 1240610.7941, 
1237579.74961, 1240610.7941, 1240177.78772, 1236713.7369, 1241043.80042, 
1241043.80042, 1238445.7623, 1239744.78139, 1239744.78139, 1239311.775, 
1241476.80678, 1237146.74329, 1241043.80042, 1241043.80042, 1241476.80678, 
1238012.756, 1241476.80678, 1240610.7941, 1240610.7941, 1241909.81311, 
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1241476.80678, 1242342.81941, 1242342.81941, 1241043.80042, 1238445.7623, 
1242775.82579, 1242775.82579, 1240610.7941, 1239311.775, 1242342.81941, 
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质心

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也许我遗漏了什么，但您是否只想“连接”两个数据帧

您可以使用要从
质心
添加到
链接
数据帧的列来表示（在这种情况下，可能是
x
和
y
合并，以及
ID
）

如果这不是你想要的，请告诉我

library(dplyr)

left_join(links, centroids[,c("x", "y", "ID")], by = c("FROM_X" = "x", "FROM_Y" = "y"))

或在R基中：

merge(links, centroids[,c("x", "y", "ID")], by.x = c("FROM_X", "FROM_Y"), by.y = c("x", "y"))