On Oct 3, 2009, at 11:54 AM, Chen Gu wrote:
Hello,
I am doing a simple if else statement in R. But it always comes out
error
such as 'unexpected error'
There are two variables. ini and b. when ini=1, a=3; when ini>1 and
b>2,
a=5; all other situations, a=6. I don't know where it is wrong.
Here is my code
ini=3
b=4
Your basic problem is that you are confusing if and else which are
program control functions with ifelse which is designed for assignment
purposes;
> ini=3
> b=4
> a <- ifelse( ini==1, 3, ifelse( ini>1 & b>2 , 5, 6))
>
> a
[1] 5
if (ini==1) {
a=3
}
else if (ini>1 and b>2 ) {
The error is probably being thrown because "and" is not a valid
conjunction operator in R.
> 1 and 1
Error: syntax error
> 1 & 1
[1] TRUE
a=5
}
else {a=6}
e.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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