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## Appendix C: Convenient Formulas for Gradient Operations

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The scalar function trace [ABT] has all the properties of an inner product, so the formulas for differentiation of the trace of various matrix products that appear in reference 1 are of interest for computing the gradients of certain inner products that appear in adaptive array optimization problems. For many problems, the extension of vector and matrix derivative operations to matrix functions of vectors and matrices is important; this generalization is described in reference 2.

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• C.1 References

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