r apply index
You can use matrix indexing, from ?[ : A third form of indexing is via a numeric matrix with the one column for each dimension: each row of ... ,2019年11月15日 — Note: the [] is required for this to work, as it tricks R into thinking that the symbol i (residing in the evaluation frame of lapply ) may ...
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 r apply index 相關參考資料
Rowcolumn counter in 'apply' functions - Stack Overflow
2015年1月23日 — Row/column counter in 'apply' functions · r apply. What if one wants to apply a functon i.e. to each row of a matrix, but also wants ... https://stackoverflow.com Index based assignment with apply in R - Stack Overflow
You can use matrix indexing, from ?[ : A third form of indexing is via a numeric matrix with the one column for each dimension: each row of ... https://stackoverflow.com Access lapply index names inside FUN - Stack Overflow
2019年11月15日 — Note: the [] is required for this to work, as it tricks R into thinking that the symbol i (residing in the evaluation frame of lapply ) may ... https://stackoverflow.com R lapply statement with index - Stack Overflow
The function mapply works like lapply but allows you to supply multiple vectors or lists. In your case you can create a second vector, the same length of ... https://stackoverflow.com R Apply() function instead of a loop requiring the index of the ...
From your description I argue that you want: my_fun <- function(x) x[sample(1:length(x), 2)] <- NA; x } apply(y, 1, my_fun) # or t(apply(y ... https://stackoverflow.com R apply on a matrix a function of columns and row index ...
Try mapply mat <- matrix(c(1, 2, 3, 4), 2, 2) mat ## [,1] [,2] ## [1,] 1 3 ## [2,] 2 4 matrix(mapply(function(x, i, j) x + i + j, mat, ... https://stackoverflow.com R access row index in apply function - Stack Overflow
Your suspicions are correct. Try this to convince yourself: f <- function(x) x <- 5 } x <- 4 f(x) # Nothing is returned x # [1] 4 y <- f(x) ... https://stackoverflow.com Keeping track of current index when using apply - Stack ...
2011年10月12日 — Keeping track of current index when using apply · r. Wanted to see if someone has a more elegant solution. But what is the appropriate way to ... https://stackoverflow.com R tutorial on the Apply family of functions - DataCamp
In this tutorial we show the use of apply in R, its variants, and a few of ... take the first element of the second row (indexes 2 and 1) for each matrix. https://www.datacamp.com Data Frames and Apply - CMU Statistics
2019年9月9日 — Three ways to index vectors, matrices, data frames, ... R offers a family of apply functions, which allow you to apply a function across ... http://www.stat.cmu.edu |