filter: subset:For data frames, the subset argument workson the rows. Note that subset will be evaluated in the data frame, so columns can be referred to (by name) as variables in the expression (see the examples). 1 2 3 4 5 6 7 8 9 10 11 data<-read.table('Z0VSZ30up.txt',h...
For data frames, the subset argument works on the rows. Note that subset will be evaluated in the data frame, so columns can be referred to (by name) as variables in the expression 1. 2. 3. 4. 对于数据框,参数在行上起作用,可以使用列名称作为表达式中的变量 > subset(patientdata,status==...
6.4.1 Name masking 6.4.2 Functions versus variables 6.4.3 A fresh start 6.4.4 Dynamic lookup 6.5 Lazy evaluation 6.5.1 Promises 6.5.2 Default arguments 6.5.3 Missing arguments 6.6 ... (dot-dot-dot) 6.1 Introduction 测试:如果读者能准确回答如下几个问题,就可以跳过本章的学习。 What are the ...
R-squared represents the proportion of the variance in the dependent variable that is predictable from the independent variables. A value of 1 implies that all the variability in the dependent variable is explained by the independent variables, while a value of 0 suggests that the independent varia...
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If you want to display more than one expression in a plot, you will have to parse them. Between-subjects design set.seed(123) library(ggridges) results_data <- oneway_anova(iris, Species, Sepal.Length, type = "robust") # create a ridgeplot ggplot(iris, aes(x = Sepal.Length, y =...
as.data.frame(matrix),可以将矩阵数据转为数据框。 查看数据框 通过head()与tail()快速查看,默认提取前六行。head(df, n) 设定参数n 调整查看n行。 可以通过str() 快速了解数据集的结构信息。 ★ 1)数据集中的observation数目。通常也就是行数。
(2)ends_with(x, ignore.case = TRUE): names ends in x (3)contains(x, ignore.case = TRUE): selects all variables whose name contains (4)matches(x, ignore.case = TRUE): selects all variables whose name matches the regular expression x ...
%{<HTTPVariableDelimiterExpression>}%{host/=^www. ([^.]+). ([^.:]+)/cdn.$2.$3:80}Använd ett reguljärt uttryck för <HTTPVariableDelimiterExpression> för att ersätta, ta bort eller ändra värdet för en HTTP-variabel. ...