I have several input data files in my working dir, I would like to read all input data and find one MAX value of all values stored in those files. Here is the code:
我的工作目录中有几个输入数据文件，我想读取所有输入数据，并找到存储在这些文件中的所有值的一个MAX值。这是代码：
##. identify files to read in
filesToProcess <- (Sys.glob("*.csv"))
filesToProcess
## Read all file and store in a list
listOfFiles <- lapply(filesToProcess, function(x) read.table(x, header = FALSE))
max(listOfFiles) #-- error
Can anyone give me suggestion how to get the MAX? Thanks a lot.
任何人都可以给我建议如何获得MAX？非常感谢。
1 个解决方案
#1
6
The max operation is not defined for a list of data.frame's, only for vectors of numbers. To get the max value of all values, you can simply use:
没有为data.frame的列表定义max操作，仅针对数字向量。要获取所有值的最大值，您只需使用：
max(unlist(listOfFiles))
where unlist recursively reduces the list of data.frame's to one vector of numbers.
其中unlist以递归方式将data.frame的列表减少为一个数字向量。
#1
6
The max operation is not defined for a list of data.frame's, only for vectors of numbers. To get the max value of all values, you can simply use:
没有为data.frame的列表定义max操作，仅针对数字向量。要获取所有值的最大值，您只需使用：
max(unlist(listOfFiles))
where unlist recursively reduces the list of data.frame's to one vector of numbers.
其中unlist以递归方式将data.frame的列表减少为一个数字向量。