我正在打开一个netcdf文件，并希望使用非重复的方法将所有变量提取到它们自己的变量名中。
目前，我可以使用以下方法来执行此操作

#route of file we want to open
fn <- "grid_T_19800105.nc"

#opens netCDF file
nc <- nc_open(fn)

#Extracts latitude and longitude matrices into variables
nav_lat <- ncvar_get(nc,"nav_lat")
nav_long <- ncvar_get(nc,"nav_lon")

#Extracts depth levels
depth <- ncvar_get(nc,"deptht")

#Extracts Temperature
votemper <- ncvar_get(nc,"votemper")

#Extracts Salinity
vosaline <- ncvar_get(nc,"vosaline")

#Extracts sea surface height
sossheig <- ncvar_get(nc,"sossheig")

#Extracts ice fraction
soicecov <- ncvar_get(nc,"soicecov")

#Close ncdf file to avoid memory loss
nc_close(nc)

但似乎有一种更快的方法来做到这一点。目前我正在尝试

#route of file we want to open
fn <- "grid_T_19800105.nc"

#opens netCDF file
nc <- nc_open(fn)

variables <- names(nc$var)

apply(variables,ncvar_get)

但这会返回错误
match.fun（FUN）中出错：缺少参数“FUN”，没有默认值