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Argument of length zero in R after if function
gi <- pm%*%t(pm); #creates a 5k by 5k matrix by multiplying matrix by its transpose
dim(gi); # checks dimensions of matrix
ngen <- dim(pm)[1];
select <- matrix(F,ncol=ngen,nrow=ngen);
for(i in 1:(ngen-1)){
    for(ii in (i+1):ngen){
        if(gi[i,ii] < llim){
            next;
        }
        hit1 <- p.sum[i];
        hit2 <- p.sum[ii];
        if(gi[i,ii] >= qmat[hit1,hit2]){
            select[i,ii] <- TRUE;
        }
    }
}

Error in if (gi[i, ii] >= qmat[hit1, hit2]) { :
  argument is of length zero

m <- matrix(1:12,4)
m[0,3] # integer(0)
if (m[0,3] > 0) 'foo!'
#Error in if (m[0, 3] > 0) "foo!" : argument is of length zero