This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Wolfram Research, Inc.

Constructing MatricesScalars, Vectors and Matrices

3.7.2 Getting Pieces of Matrices

Ways to get pieces of matrices.

Matrices in Mathematica are represented as lists of lists. You can use all the standard Mathematica list-manipulation operations on matrices.

Here is a sample matrix.

In[1]:= t = Array[a, {3, 3}]

Out[1]=

This picks out the second row of the matrix.

In[2]:= t[[2]]

Out[2]=

Here is the second column of the matrix.

In[3]:= t[[All, 2]]

Out[3]=

This picks out a submatrix.

In[4]:= Take[t, {1, 2}, {2, 3}]

Out[4]=

Constructing MatricesScalars, Vectors and Matrices