# [R] Need help on matrix manipulation

Ron_M ron_michael70 at yahoo.com
Mon Mar 29 09:44:12 CEST 2010

```Dear all,

Ket say I have 3 matrices :

mat1 <- matrix(rnorm(16), 4)
mat2 <- matrix(rnorm(16), 4)
mat3 <- matrix(rnorm(16), 4)

Now I want to merge those three matrices to a single one with dimension
4*3=12 and 4 wherein

on resulting matrix, row 1,4,7,10 will be row-1,2,3,4 of "mat1", row
2,5,8,11 will be row-1,2,3,4 of "mat2" and row 3,6,8,12 will be row-1,2,3,4
of "mat3". For example suppose the matrices are :

> mat1
[,1]       [,2]        [,3]        [,4]
[1,] -0.3597661 -0.8725675  0.92033577  0.42461934
[2,] -1.0431990 -0.5221843  0.31821494 -0.01963307
[3,]  0.4736285 -1.3917844  0.03776291  0.52503899
[4,]  0.2341584  0.2959110 -0.33166146  1.22208331

> mat2
[,1]       [,2]       [,3]       [,4]
[1,]  1.0666719 -1.0310117 -1.4418511 -0.2461388
[2,]  2.0099067 -0.3866974 -0.2978510  0.9377186
[3,] -1.5532591 -0.1341572 -1.0745971  0.1120120
[4,]  0.4318782  0.1166596 -0.6320177 -0.4709091

> mat3
[,1]        [,2]       [,3]       [,4]
[1,] -0.15092091  1.11900300  0.7173543  0.3631286
[2,] -1.09844902  1.55239518 -0.5049884  0.8974597
[3,] -1.60176717 -0.03991147 -1.2475162  1.4643000
[4,] -0.06721017 -0.88329791 -1.9875210 -0.7989177

then the resulting matrix will be :

-0.3597661	-0.8725675	0.92033577	0.42461934
1.0666719	-1.0310117	-1.4418511	-0.2461388
-0.15092091	1.119003	0.7173543	0.3631286
-1.043199	-0.5221843	0.31821494	-0.01963307
2.0099067	-0.3866974	-0.297851	0.9377186
-1.09844902	1.55239518	-0.5049884	0.8974597
0.4736285	-1.3917844	0.03776291	0.52503899
-1.5532591	-0.1341572	-1.0745971	0.112012
-1.60176717	-0.03991147	-1.2475162	1.4643
0.2341584	0.295911	-0.33166146	1.22208331
0.4318782	0.1166596	-0.6320177	-0.4709091
-0.06721017	-0.88329791	-1.987521	-0.7989177

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