R语言中,cbind和rbind区别

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cbind： 根据列进行合并，即叠加所有列，m列的矩阵与n列的矩阵cbind()最后变成m+n列，合并前提：cbind(a, c)中矩阵a、c的行数必需相符

rbind： 根据行进行合并，就是行的叠加，m行的矩阵与n行的矩阵rbind()最后变成m+n行，合并前提：rbind(a, c)中矩阵a、c的列数必需相符

> a <- matrix(1:12, 3, 4)> print(a)     [,1] [,2] [,3] [,4][1,]    1    4    7   10[2,]    2    5    8   11[3,]    3    6    9   12> > b <- matrix(-1:-12, 3, 4)> print(b)     [,1] [,2] [,3] [,4][1,]   -1   -4   -7  -10[2,]   -2   -5   -8  -11[3,]   -3   -6   -9  -12> > x=cbind(a,b)> print(x)     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8][1,]    1    4    7   10   -1   -4   -7  -10[2,]    2    5    8   11   -2   -5   -8  -11[3,]    3    6    9   12   -3   -6   -9  -12> > y=rbind(a,b)> print(y)     [,1] [,2] [,3] [,4][1,]    1    4    7   10[2,]    2    5    8   11[3,]    3    6    9   12[4,]   -1   -4   -7  -10[5,]   -2   -5   -8  -11[6,]   -3   -6   -9  -12> > > c <- matrix(-1:-20, 4, 5)> print(c)     [,1] [,2] [,3] [,4] [,5][1,]   -1   -5   -9  -13  -17[2,]   -2   -6  -10  -14  -18[3,]   -3   -7  -11  -15  -19[4,]   -4   -8  -12  -16  -20> > x2=cbind(a,c)Error in cbind(a, c) : 矩阵的行数必需相符(见arg2)> print(x2)     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9][1,]    1    4    7   10   -1   -4   -7  -10  -13[2,]    2    5    8   11   -2   -5   -8  -11  -14[3,]    3    6    9   12   -3   -6   -9  -12  -15> > y2=rbind(a,c)Error in rbind(a, c) : 矩阵的列数必需相符(见arg2)> print(y2)Error in print(y2) : 找不到对象'y2'>

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