问题描述
set.seed(12345);
data0 = data.frame(ID=1:20,SARS=sample(c(0,1),size=20,replace=T,prob=c(0.9,0.1))) #20 people are connected randomly by 30% chance (57).
ID1ID2 = NULL
for(i in 1:19) {
temp = i*100 + (i+1):20
ID1ID2 = c(ID1ID2,temp)
print(i)
}
length(ID1ID2)
set.seed(12345)
ties = sample(ID1ID2,size=57,replace=F)
data1 = data.frame(ID1 = floor(ties/100),ID2 = ties-floor(ties/100)*100)
data2 = data.frame(ID1 = ties-floor(ties/100)*100,ID2 = floor(ties/100))
data3 = rbind(data1,data2)
data4 = merge(data3,data0,all.x=T,all.y=F,by.x="ID2",by.y="ID")
data0$SARS_fr = NA
for(i in 1:20) {
data0[data0$ID==i,"SARS_fr"] = ifelse(sum(data4[data4$ID1==i,"SARS"])>=1,yes = 1,no = 0)
print(i) }
有没有大神帮忙看看如何用一段5-10行的代码实现上面的代码功能?谢谢!
解决方法
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