我们知道R存在复制修改机制,这在进行大数据计算时开销很大,data.table提供了一系列支持语义的set函数,它们可以原地修改data.table,因此避免不必要的复制。 仍以product_stats为例,我们可以使用setDF()函数不要任何复制就可以将data.table变成data.frame。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 product_st...
Task3:使用COVID数据集(COVID_20210908_rph.rData),创建描述性统计的“表1”,总体上按每100000人的医院数量(hospitals_per_100k)计算(使用中值分割来创建此“by”变量的二进制版本)。请在此表中描述以上变量。 #Task3: load("covid_20210908_rmph.rData") library(gtsummary) covid <- covid %>% mutate...
myfunction <- function(x){ nc <- ncol(x) means <- numeric(nc) for(i in 1:nc){ means[i] <-mean(x[,i]) } means } DF <- data.frame(DT[,.(n_1,n_2,n_3)]) myfunction(DF) #如果某列有NA,计算得出的数值是NA #添加参数,设置移除缺失值 myfunction <- function(x,removeNA=T...
The recommended value is'pixels', because most MATLAB app building functionality measures distances in pixels. You can create a table that rescales based on the size of the parent container by parenting the table to a grid layout manager created using theuigridlayoutfunction. For more information...
util.function.Consumer; public class HBaseTest_01 { public static void main(String[] args) throws Exception { // 批执行环境 ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); // 表环境 EnvironmentSettings settings = EnvironmentSettings.newInstance() .useBlinkPlanner() .in...
The HTML rendering of the same two pivot tables shown above (each constructed using both a quick-pivot function and verbose syntax) is: library(pivottabler) qhpvt(bhmtrains,"TOC","TrainCategory","n()") library(pivottabler)pt<-PivotTable$new()pt$addData(bhmtrains)pt$addColumnDataGroups(...
A pointer to a temporary table with memory allocated in the thread's memroot, NULL if the table could not be created If the function is unable to create the conversion table, an error will be printed and NULL will be returned. Returns ...
Before R2021a, use commas to separate each name and value, and encloseNamein quotes. Example:"RowNames",["row1","row2","row3"]uses the row names,row1,row2, androw3for the table,T. Row names, specified as a cell array of character vectors or string array, whose elements are none...
With this function, the set of values (6, 9, 9, 14) would be ranked (4, 2, 3, 1). Nulls are ignored in ranking functions. They are not numbered and they do not count against the total number of records in percentile rank calculations. ...
# a function to provide p-values that indicate differences among groupspvalue<-function(x,...){x<-x[-length(x)]# Remove "overall" group# Construct vectors of data y, and groups (strata) gy<-unlist(x)g<-factor(rep(1:length(x),times=sapply(x,length)))if(is.numeric(y)){# For ...