search for: tp19907970p19908084

Hi all, I am quite sure it's not a bug, but I am going nuts about this. I do not possibly understand why I get different results for b1 and b2 as shown below. x=c(183,191,192,193,195,206,207,209,210,211,212,213,214,217,218,221,222,223, 224,225,227,228,229,230) y=c(221,225,228,241,242) z=y[y<max(x)] ##all Ys smaller than the maximum of X a=ifelse(length(z)==0,NA,max(z)) ##assign NA if