如何从R中的netCDF文件中提取变量名? [英] How to extract variable names from a netCDF file in R?

问题描述

我正在R中编写一个函数，以从netCDF文件中提取一些空气质量建模数据.我已经安装了"ncdf"软件包.

I am writing a function in R to extract some air quality modelling data from netCDF files. I have the Package "ncdf" installed.

为了允许其他用户或本人选择要从netCDF文件中提取哪些变量，我想提取该文件中所有变量的名称，以便我可以显示在一个简单列表中，而不只是提供过多信息的文件.有什么办法吗?

In order to allow other users or myself to choose what variables to extract from a netCDF file, I would like to extract the names of all variables in the file, so that I can present in a simple list rather than just print.ncdf() the file to give too much information. Is there any way of doing it?

我尝试了unlist()到ncdf对象的var字段，但似乎它也返回了内容...

I tried unlist() to the var field of the ncdf object but it seemed that it returned the contents as well...

我搜索并搜索了堆栈* 溢出 *，但似乎没有找到答案，因此非常感谢您的帮助.

I googled and searched stack*overflow* but didn't seem to find an answer, so your help is very much appreciated.

非常感谢.

推荐答案

如果您的ncdf对象称为nc，则非常简单:

If your ncdf object is called nc, then quite simply:

names(nc$var)

以示例为例，使用下载的数据集在这里(因为您没有提供):

With an example, using the dataset downloaded here, for instance (since you didn't provide with one):

nc <- open.ncdf("20130128-ABOM-L4HRfnd-AUS-v01-fv01_0-RAMSSA_09km.nc")
names(nc$var)
[1] "analysed_sst"     "analysis_error"   "sea_ice_fraction" "mask"   

这篇关于如何从R中的netCDF文件中提取变量名?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！