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Comment/Response |
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 09/19/06 06:00am
Look at the Dimensions of you matrix and recall how matrix dimensions are refered to in general mathematics, i.e. n X m. From what you write, I am guessing that you have a flat list such as
{1,2,3}
In[]:= Dimensions[{1,2,3}]
Out[]= {3}
Now consider:
In[]:= a = {{1, 2, 3}}
Out[]= {{1, 2, 3}}
In[]:= Dimensions[a]
Out[]= {1,3}
In[] := aT = Transpose[a]
Out[]= {{1}, {2}, {3}}
In[]:= Dimensions[aT]
Out[]= {3,1}
These dimensions match the standard requirement for dot products:
Look at the "shape":
In[]:= MatrixForm[a]
Out[]//MatrixForm=
1 2 3
In[]:= MatrixForm[aT]
Out[]//MatrixForm=
1
2
3
Now the Dot product:
In[]:= a . aT
Out[]= {{14}}
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