生信技能树—单细胞R考核题

发表于2019年7月1日由daizao 
rownames(df) <- df$LETTERS
dz <- df[-1]

for (i in 1:(ncol(dz))){
    for (j in 1:nrow(dz)){
        if(dz[j,i] < 0){
            dz[j,i] <- 0
        }
    }
}

a <- data.frame()
for (i in 1:nrow(dz)){
    if (sum(dz[i,]) > 0){
        a <- rbind(a,dz[i,])
    }
}
head(a)
#a即为目标结果

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