假设你的变量x可以取“a”或“b”的值。现在问这个问题：“is x not equal to a OR is x not ...
(10)寻找男企鹅(公企鹅) 函数filter() 中的逻辑运算符 OperatorMeaning == Equal to > Greater than < Less than >= Greater than or equal to <= Less than or equal to != Not equal to %in% in is.na is a missing value (NA) !is.na is not a missing value & and | or # ---1 pengu...
假设你的变量x可以取“a”或“b”的值。现在问这个问题：“is x not equal to a OR is x not ...
dplyr::filter(iris,Sepal.Length>7) Extractrowsthatmeetlogicalcriteria. dplyr::distinct(iris) Removeduplicaterows. dplyr::sample_frac(iris,0.5,replace=TRUE) Randomlyselectfractionofrows. dplyr::sample_n(iris,10,replace=TRUE) Randomlyselectnrows. ...
not_canceled <- flights %>% filter(!is.na(dep_delay), !is.na(arr_delay)) not_cancelled %>% count(dest) not_cancelled %>% count(tailnum, wt = distance) # 可以先分组再求每组的长度。 not_cancelled %>% group_by(dest) %>% summarise(n = length(dest)) not_cancelled %>% group_by...
filter() and lag() throw informative error if used with ts objects (#2219) mutate() recycles list columns of length 1 (#2171). mutate() gives better error message when attempting to add a non-vector column (#2319), or attempting to remove a column with NULL (#2187, #2439). summar...
filter_fst(Real >= 50) %>% count_dt(Factor)-> res }) res 删除本地数据 unlink("./df.fst") tidyfst 正式 学习 这个包处理函数很快,所以我要将这个包用于宏基因组数据探索,这里 1 arrange_dt :排序 #--使用数据 data(iris) #---按照...
What if we want to filter on several conditions? To do that, we need to use logical operators. Example: year equal to 2001 AND city equal to ‘Abilene’ Let’s take a look at a concrete example. In this new example, let’s extend the previous example. Previously, we filtered the dat...
dplyr::top_n(storms, 2, date) Select and order top n entries (by group if grouped data).<>==<=>=Less thanGreater thanEqual toLess than or equal toGreater than or equal todevtools::install_github("rstudio/EDAWR") for data sets!=%in%is.na!is.na&,|,!,xor,any,allNot equal to...
Mutating joins, which add new variables to one table from matching rows in another:inner_join(),left_join(),right_join(),full_join(). (Support for non-equi joins is planned for dplyr 0.5.0.) Filtering joins, which filter observations from one table based on whether or not they match ...