Re: [R] If statement not working in a for loop when making it independent

You have really tied yourself up in a knot here. Last I checked, when A==B, then B==A. You also need to study the difference between ?if and ?ifelse, since you are not giving the if function the scalar it expects. For example, i$ID is a vector of three (identical, due to your use of split) value

[R] If statement not working in a for loop when making it independent

Dear all, I have a data.frame xy that contains numeric data and data_qual which contains qualitative data which I want to include in a for loop with an if statement (commented out in the code below). The if statement should be applied if the ID in data_qual$ID is the same than in xy$ID. I am t