学校刚开始学这个，条件语句一直报错，不知道哪里出问题了，谢谢各位老师 求助
setwd("F:/")
mydata=read.csv("HealthExpend.csv")
attach(mydata)
myrace=mydata$RACE
myrace
n=2000
t1=c(rep(0,n))
for(i in 1:n)if{(myrace[i]="WHITE") t1[i]="4"
else if(myrace[i]="BLACK")
t1[i]="2"
else
t1[i]="0"}

报错：


Error: unexpected '{' in "for(i in 1:n)if{"
> else if(myrace[i]="BLACK")
Error: unexpected 'else' in "else"
> t1[i]="2"
Error in t1[i] = "2" : object 'i' not found
> else
Error: unexpected 'else' in "else"
> t1[i]="0"}
Error: unexpected '}' in "t1[i]="0"}"