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[[category:Internal Functions]]
[[Category:Doc Status C]] <!-- For Lumina use, do not change -->

To compute the dot product of two vectors, use:
:<code>Sum(A*B, I)</code>

where «I» is the index shared by the two vectors.

The [[DotProduct]] function does the same, i.e., [[DotProduct]](A, B, I).  Analytica's parser recognizes a dot product of the form [[Sum]](A*B, I) and optimizes it as a call to [[DotProduct]], which avoids an allocation for the intermediate value of <code>A*B</code>.   But [[DotProduct]] is not intended to be used explicitly.

==See Also==
* [[MatrixMultiply]]
* [[Decompose]]
* [[Matrix functions]]
* [[:Category:Matrix Functions]]