How to Use is.na in R (With Examples) - Statology
2021年6月18日 · You can use the is.na () function in R to check for missing values in vectors and data frames. is.na(x) #count total NA values. sum(is.na(x)) #identify positions of NA values. …
NA function - RDocumentation
NA is a logical constant of length 1 which contains a missing value indicator. NA can be coerced to any other vector type except raw. There are also constants NA_integer_, NA_real_, …
R null values: NULL, NA, NaN, Inf - R-bloggers
2018年7月4日 · R language supports several null-able values and it is relatively important to understand how these values behave, when making data pre-processing and data munging. In …
r - What is the difference between <NA> and NA ... - Stack Overflow
2013年4月27日 · When you are dealing with factors, when the NA is wrapped in angled brackets ( <NA> ), that indicates that it is in fact NA. When it is NA without brackets, then it is not NA, but …
r - Set certain values to NA with dplyr - Stack Overflow
2015年1月13日 · The most natural approach in dplyr is to use the na_if function. For one variable: For all variables: If interested in replacing a specific value, instead of a range for all variables: …
NA、Inf、NaN、NULL等值处理 - 腾讯云
2018年12月6日 · 这几个都是R语言里面的特殊值，都是R的保留字(reserved words)。它们的意义分别为： • NA：表示缺失值(Missing value)，是“Not Available”的缩写 • Inf：表示无穷大， …
na.tools package - RDocumentation
na.tools is a comprehensive library for handling missing (NA) values. It has several goals: provide a consistent and intuitive interface. In this package, there are methods for the detection, …
na_if function - RDocumentation
tidyr::replace_na() to replace NA with a value. recode() to more generally replace values. x <- c(1, -1, 0, 10) 100 / x. 100 / na_if(x, 0) y <- c("abc", "def", "", "ghi") na_if(y, "") # na_if() is …
R NA – What are <Not Available> Values? - Statistics Globe
2018年9月14日 · In R (or R Studio), NA stands for Not Available. Each cell of your data that displays NA is a missing value. Not available values are sometimes enclosed by < and >, i.e. …
RNA激活 - 百度百科
RNAa是由靶向特定的基因启动子区域的双链小RNA（dsRNA）分子介导。 这类针对基因非编码区的dsRNA被称为agRNA（antigene RNA）, 其中能诱导RNAa现象（激活基因表达）的agRNA …