R 定义函数 ，里面嵌套条件

myfunction<-function(arg1,arg2,...){
statements
return (object)
}

例1

 function1<-function(x,y){plot(x,y)
+     return(x+y)}
x<-rnorm(10)
x

y<-rnorm(10,2,3) 

function1(x,y)

 例2 嵌套条件

> function2<-function(x,npar=TRUE,print=TRUE){
+     if(!npar){
+         center<-mean(x);spread<-sd(x)
+     }else{
+         center<-median(x);spread<-mad(x)
+         
+     }   
+     if (print & !npar){
+         cat("Mean",center,"\n","SD=",spread,"\n")
+     }else if(print & npar){
+         cat("Median=",center,"\n","MAD=",spread,"\n")
+     }
+     result<-list(center=center,spread=spread)
+     return(result)
+     }
x<-rnorm(10,0,1)
 function2(x)

条件