我是R编程的初学者.我现在正试图从包含X和Y坐标和站点名称的数据框中检索一些站点名称,并将它们复制到具有特定点的不同数据帧中.
FD <- matrix(data =c(rep(1, 500), rep(0, 500),
rnorm(1000, mean = 550000, sd=4000),
rnorm(1000, mean = 6350000, sd=20000), rep(NA, 1000)),
ncol = 4, nrow = 1000, byrow = FALSE)
colnames(FD) <- c('Survival', 'X', 'Y', 'Site')
FD <- as.data.frame(FD)
shpxt <- matrix(c(526654.7,526810.5 ,6309098,6309187,530405.4,530692,
6337699, 6338056,580432.7, 580541.9, 6380246,6380391,
585761.3, 585847.6, 6379665, 6379759, 584192.1, 584279.4,
6382358, 6382710, 583421.2, 583492.4, 6379356, 6379425,
532395.5, 532515.3 , 6336421, 6336587, 534694.6, 534791.2,
6335620, 6335740, 536749.8, 536957.5, 6337584, 6338130, 590049.6,
590419.4, 6372232, 6372432, 580443, 580756.5, 6386342, 6386473,
575263.9, …