r - 在 R 中运行 apply 函数时有没有办法打印迭代次数

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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办法知道到目前为止工作进展如何，到目前为止查看了多少元素，或者类似的东西？

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，每当处理完 10% 的数据时，您可以打印通知；

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"