编程时无需声明变量的类型、 基本格式函数名-function(数据,参数*默认值,)异常处理;表达式(循环/判别);return(返回值);函数内部也可用#添加注释if判断,f循环用法if (条件)表达式1 else表达式2 if (p if (p0.8) print (W) else print (FFN: fP)1 MN:P,A if (p0.8) p 36、rint (,rY,r)+ else ...
The last R expression to be evaluated in a function will become the return value of that function. We want this function to take one argument, x, and return x without modifying it. Delete the pound sign so that x is returned without any modification. Make sure to save your script before...
return(NA) # 如果 test 是 NA,直接返回 NA,否则执行下列代码 # test 为 TRUE 时执行下列代码 else if (test) { if (length(yes) == 1) { yat <- attributes(yes) if (is.null(yat) || (is.function(yes) && identical(names(yat), "srcref"))) #若 yes 符合上述格式,返回 yes,否则 report...
The print function displays the data table in memory. The print function has many optional parameters. Notice that the output inFigure 1displays data item indices starting at 1. For array, matrix and object indices, R is a 1-based language, rather than 0-based like th...
Register the launcher and the function as follows: /nz/export/ae/utilities/bin/register_ae --language r --version 3 \ --template udtf --exe /tmp/applyop.R --sig "launch_remote_applyop(INT8)" \ --return "TABLE(aeresult varchar(255))" --db dev --user nz \ --remote --rname ...
register the actual data-processing interface: /nz/export/ae/utilities/bin/register_ae --language r \ --version 3 --template udtf --db dev --user nz --level 4 \ --mask DEBUG --lastcall 'table final' --exe remote.R \ --sig "remote_rae(VARARGS)" --return "TABLE(cnt DOUBLE)" ...
# 其它函数:read.fastq可下载、读取Fastq;read.GenBank;read.gff;as.DNAbin;dist.dna;clustal/muscle(多序列比对) # dnds dN/dS Ratio # dnds(ex.dna, code = 1, codonstart = 1, quiet = FALSE, details = FALSE, return.categories = FALSE) # Error: sequences are not unique # data(woodmouse...
函数函数的定义函数以def关键词开头,后接函数名和圆括号()。函数执行的代码以冒号起始,并且缩进。return [表达式] 结束函数,选择性地返回一个值给调用方。不带表达式的return相当于返回None语法def functionname (parameters): "函数文档字符串" functionsuite return [expression ...
`[[<-.data.table`<-function(x,i,j,value){warning("Don't do this. Use := instead.")call=sys.call()call[[1L]]=`[[<-.data.frame` ans=copy(eval(call,envir=parent.frame()))}foo<-function(mydt){mydt[,c:=c("a","b")]return(123)}x<-data.table(a=c(...
talk = function() { return(paste0(callSuper(), language)) } ) ) Chinese$lock("language") American <- setRefClass( "American", contains = "Person", fields = list( language="character" ), methods = list( initialize = function(name, age, language="english") { ...