Expand.grid r用法
WebSep 21, 2024 · R中的stack和unstack函数. 我们用R做数据处理的时候，经常要对数据的格式进行变换。. 例如将数据框（dataframe）转换成列表（list），或者反过来将列表转换成数据框。. 那么今天小编就给大家介绍一对R函数来实现这样的功能。. 这一对函数就叫做 stack 和 … WebJun 6, 2024 · hw_grid <- expand.grid (type,trend,seasonal) print (hw_grid) 那么观察一下，这组输出的规律：. 首先，一共18行恰好是 2*3*3. 输出的结果跟三层嵌套循环很像：. …
Expand.grid r用法
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Webexpand() generates all combination of variables found in a dataset. It is paired with nesting() and crossing() helpers.crossing() is a wrapper around expand_grid() that de-duplicates and sorts its inputs; nesting() is a helper that only finds combinations already present in the data. expand() is often useful in conjunction with joins: use it with right_join() to convert implicit … WebJan 14, 2015 · I would like to expand a grid in R such that the expansion occurs for unique values of one variable but joint values for two variables. For example: frame <- data.frame(id = seq(1:2),id2 = seq(1:2), year = c(2005, 2008))
Webx使用一个更简单的示例，这样我们就可以看到正在做什么. arr <- array(seq_len(3*3*3), dim = rep(3,3,3)) 更新：使用@TimP答案中的示例，我更新了答案，以展示如何以更像R的方式完成 给定. 虽然坚持使用循环等熟悉的习惯用法很有诱惑力，但与流行的观点相反，循环在R中并非低效，学习以矢量化的方式思考将 ... WebMany options available to get the desired result. But perhaps OP seems to be keen on using tidyr::expand. A solution can be as: library (dplyr) library (tidyr) df %>% group_by (Var1, Var2) %>% expand (ID = 1:2) %>% arrange (ID) # # A tibble: 8 x 3 # # Groups: Var1, Var2 [4] # Var1 Var2 ID # # 1 a a 1 # 2 a b 1 # 3 b a 1 # 4 b ...
Webexpand.grid()R语言中的函数用于创建一个 DataFrame ，其中包含所有值，这些值可以通过作为参数传递给函数的所有向量或因子的组合形成。 用法： expand.grid(…) WebCreate a data frame from all combinations of the supplied vectors or factors. See the description of the return value for precise details of the way this is done.
WebAug 20, 2016 · 命令的资料 ，本人英语较差，看不太懂，但是我觉得这个输出应该就是这样的. 在R for beginning 中. 有这么一个例子. expand .grid (h = c ( 60,80 ), w = c ( 100, 300 ), sex = c ( "Male", "Female" )) 输出的是. h w sex 1 60 100 Male 2 80 100 Male 3 60 300 Male 4 80 300 Male 5 60 100 Female 6 80 100 Female 7 ...
WebMar 23, 2024 · 在本章中，为了帮助小瓦评估她的“低买高卖”策略，我们简单设计 了一个回测程序，通过小瓦总资产的变化来评价策略的业绩表现；随后 又介绍了两个经典的交易策略——双移动平均策略和海龟策略。. 当然， 这两种策略都是基于市场动量的变化而设计的 ... shush twitchWebSep 13, 2024 · 9. ggplot2中expand参数. 我们似乎没有担心过数据点被画到axes之外，这是因为ggplot2会在data range和axes之间加一些padding，以保证数据和坐标轴不会重叠：. For position scales, a vector of range expansion constants used to add some padding around the data to ensure that they are placed some distance away ... shush urban dictionaryWebJun 18, 2013 · I recently came across this question R - Expand Grid Without Duplicates and as I was searching for duplicates, I found this question. The question there isn't exactly a duplicate, as it is a bit more general and has additional restrictions which @Ferdinand.kraft shined some light on. shushu jiang cell researchWebDec 25, 2024 · 在R中，expand.grid()函数可以返回几个元素所有可能的组合，使我们免于多层遍历的苦恼。比如如下例子： 上述代码输出： 其实这个就是我们提供 … the owlette songtheowletteWeb接下来要用到grid包的函数了。. 首先来p一个横线上去，把三个图的x轴连起来：. grid::grid.lines (x = c (0.09,0.95), y = c (0.095,0.095),gp = gpar (lwd = 2)) 如果你是实际操作的话，应该能知道为什么这个函数不适合业务化出图，因为需要手动调整x跟y坐标。. 如果我 … the owlets ampleforthWebJun 17, 2013 · > expand.grid(c("aa", "ab", "cc"), c("aa", "ab", "cc")) Var1 Var2 1 aa aa 2 ab aa 3 cc aa 4 aa ab 5 ab ab 6 cc ab 7 aa cc 8 ab cc 9 cc cc Do you know an efficient way … shush up music video