What is the fastest way to transpose a matrix in C

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I have a reasonably large matrix that I need to transpose. 

Assume, for example, that my matrix is

a b c d e f
g h i j k l
m n o p q r 

I want the result be as follows:

a g m
b h n
c I o
d j p
e k q
f l r

What is the fastest way to do this?

Jul 15 in C++ by Nicholas
• 5,020 points
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