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我正在尝试使用 R 中“dismo”包中的 bioclim 方法运行物种分布建模。

安装必要的包然后加载它后，一切似乎正常。

并且“dismo”包出现在Rstudio的包框中，它也被选中。

#install packages
install.packages("dismo")
install.packages("maptools")
install.packages("rgdal")
install.packages("raster")
install.packages("sp")

#Loading Libraries
library("sp")
library("raster")
library("maptools")
library("rgdal")
library("dismo")

但是，在我尝试运行 bioclim 方法后，出现以下错误。

Error in (function (classes, fdef, mtable)  : unable to find an inherited method for function ‘bioclim’ for signature ‘"character", "data.frame"’

当我尝试检查该方法的“帮助”部分时，出现以下错误：

Error in find.package(if (is.null(package)) loadedNamespaces() else package,  : 
there is no package called ‘package:dismo’

这是我使用的完整代码

setwd("D:/Riset/MaxentSelaginella/newpaperproject_part2/MakalahVI/Workspace_R")
dir.create(path="data2")
dir.create(path="output2")

#install additional R Packages
install.packages("dismo")
install.packages("maptools")
install.packages("rgdal")
install.packages("raster")
install.packages("sp")

#Loading Libraries
library("sp")
library("raster")
library("maptools")
library("rgdal")
library("dismo")

#input Occurrence data & clim variables
obs.data <- read.csv(file = "data3/Selaginella_plana.csv")
bio.var <- list.files(path = "data3/asc/", pattern = ".asc")  

# Determine geographic extent of our data
max.lat <- ceiling(max(27))
min.lat <- floor(min(-11))
max.lon <- ceiling(max(122))
min.lon <- floor(min(120))
geographic.extent <- extent(x = c(min.lon, max.lon, min.lat, max.lat))

# Load the data to use for our base map
data(wrld_simpl)

# Plot the base map
plot(wrld_simpl, 
    xlim = c(min.lon, max.lon),
    ylim = c(min.lat, max.lat),
    axes = TRUE, 
    col = "grey95")

 # Add the points for individual observation
  points(x = obs.data$longitude, 
      y = obs.data$latitude, 
      col = "olivedrab", 
      pch = 20, 
      cex = 0.75)

  # And draw a little box around the graph
  box()

  # Build species distribution model
  bc.model <- dismo::bioclim(x = bio.var, p = obs.data)

谁能解释为什么会出现这样的错误以及如何解决？先谢谢了~

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