Further Examples: MapIndexed

Here is a matrix.

In[1]:=

Out[1]//MatrixForm=

Here the nth row of aa has been rotated n places to the left.

In[2]:=

Out[2]//MatrixForm=

The defined function DiagonalQ tests whether or not a matrix is diagonal.

In[3]:=

In[4]:=

Out[4]=

In[5]:=

Out[5]=

In[6]:=