R计算data.frame行row平均方法有2种 ：rowMeans()和apply()
创建data.frame,计算平均分Avg_score
df1 = data.frame( Name = c(‘Pyyy’,’Pyu’, ‘Mic’,’Maie’,’Rvi’,’Xin’,’Jan’),
Mathematics1_score=c(88,57,50,73,30,97,89),
Mathematics2_score=c(45,78,44,89,66,49,72),
Science_score=c(56,52,45,88,33,90,47))
计算方法如下
方法1.rowMeans()
df1$Avg_score = rowMeans(df1[,c(2,3,4)])
方法2.apply()
df1$Avg_score = apply(df1[,-1], 1, mean)
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