Hi:

This seems to work for your example:

matrix(t(cbind(mat1, mat2, mat3)), ncol = 4, byrow = TRUE)

HTH,
Dennis

On Mon, Mar 29, 2010 at 12:44 AM, Ron_M <ron_michael70@yahoo.com> wrote:

>
> 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
>
> --
> View this message in context:
> http://n4.nabble.com/Need-help-on-matrix-manipulation-tp1694804p1694804.html
> Sent from the R help mailing list archive at Nabble.com.
>
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