Re: Combine matrices of equal height
- To: mathgroup at smc.vnet.net
- Subject: [mg111034] Re: Combine matrices of equal height
- From: "David Park" <djmpark at comcast.net>
- Date: Sun, 18 Jul 2010 01:02:15 -0400 (EDT)
Here are two sample matrices.
m1 = Array[1 &, {3, 2}];
m2 = Array[2 &, {3, 3}];
Transpose[Join[Transpose[m1], Transpose[m2]]] // MatrixForm
Another method that doesn't explicitly use Join and Transpose is to make a
new blank matrix first and then fill in the parts using the Span notation.
This might be more intuitive.
m3 = Array[0 &, {3, 5}];
m3[[All, 1 ;; 2]] = m1;
m3[[All, 3 ;; 5]] = m2;
m3 // MatrixForm
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/
From: Sam Takoy [mailto:sam.takoy at yahoo.com]
Hi,
Given two matrices of equal height, what's the best way to combine them.
Here's what I did
TF[m_] := Flatten[Transpose[m]]
Combine[m1_, m2_] :=
Partition[Join[m1 // TF, m2 // TF], Length[m1]] // T
Surely there's a better way of doing it.
Thanks!