在R中运行Apply函数时，有没有一种打印迭代次数的方法

Question

我在一个大数据集上运行了一个apply-family函数，所以我想知道是否有一种方法可以知道到目前为止的工作情况，到目前为止已经查看了多少个元素或类似的东西？

Answer 1

您可以考虑创建一个全局计数器，并指定何时打印进度，例如，您可以在处理了 10% 的数据时打印通知；

counter <- 0
data <- rnorm(100)
results <- sapply(data, function(x) { 
                  counter <<- counter + 1; 
                  if(counter %in% seq(0, length(y), 10)) 
                      print(paste(counter, "% has been processed"))})

[1] "10 % has been processed"
[1] "20 % has been processed"
[1] "30 % has been processed"
[1] "40 % has been processed"
[1] "50 % has been processed"
[1] "60 % has been processed"
[1] "70 % has been processed"
[1] "80 % has been processed"
[1] "90 % has been processed"
[1] "100 % has been processed"