555win cung cấp cho bạn một cách thuận tiện, an toàn và đáng tin cậy [r germany]
12 thg 10, 2014 · I want to use dplyr::mutate () to create multiple new columns in a data frame. The column names and their contents should be dynamically generated. Example data from iris: library (dplyr) iris <-
28 thg 5, 2021 · I have recently come across the code |> in R. It is a vertical line character (pipe) followed by a greater than symbol. Here is an example: mtcars |> head() What is the |> code doing?
A carriage return (\r) makes the cursor jump to the first column (begin of the line) while the newline (\n) jumps to the next line and might also to the beginning of that line.
There are some differences between <- and = in the past version of R or even the predecessor language of R (S language). But currently, it seems using = only like any other modern language (python, java) won't cause any problem.
Using dplyr, the & and | logical operators are used. I have accidentally used && and II many times (because I am also a C# programmer) and it returns the incorrect results that one would expect from using the logical AND and OR.
25 thg 11, 2014 · I have seen the use of %>% (percent greater than percent) function in some packages like dplyr and rvest. What does it mean? Is it a way to write closure blocks in R?
11 thg 1, 2022 · R provides two different methods for accessing the elements of a list or data.frame: [] and [[]]. What is the difference between the two, and when should I use one over the other?
intel的核显，就是买CPU免费送的。 intel的UHD核显正式退休了，Arc核显算是进步很大的一代，以前买饭免费送的一次性筷子，现在是送的一个质量次一点的钢勺。 ps：有人说可能是独显，我觉得不可能， intel的锐炫独显肯定是要带编号的，比如Intel (R) Arc (TM) A750 Graphics，A750就是独显的代号。
It's a matrix multiplication operator! From the documentation: Description: Multiplies two matrices, if they are conformable. If one argument is a vector, it will be promoted to either a row or column matrix to make the two arguments conformable. If both are vectors of the same length, it will return the inner product (as a matrix). Usage: x %*% y Arguments: x, y numeric or complex …
1080P/2K/4K分辨率，以RTX 5050为基准（25款主流游戏测试成绩取平均值） 数据来源于：TechPowerUp 桌面端显卡天梯图：
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