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## Implementation of mldivide?

**From**: |
CdeMills |

**Subject**: |
Implementation of mldivide? |

**Date**: |
Tue, 26 Jul 2011 01:33:33 -0700 (PDT) |

Hello,
I compute the derivative of some vector like this: from an input data vector
y, I first compute a vector Z. From the values of Z I compute L, whose
columns are function of elements Zi. Then I compute
B = L\y
Now I'm trying to compute dB/dZ. To this end, I assume that the analytical
form of B is
B=inv(L.'*L)*L.'*y
I obtain a formulation implying B, L, y, and dL/dZ. When I try to validate
this by simulations, i.e. introducing noise on y, having Z, L, and B varying
with noise, I can validate most of the components of dBdZ, but not all. So
I'm wondering: how is mldivide implemented analytically ? In which source
file is its code ?
Regards
Pascal
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**Implementation of mldivide?**,
*CdeMills* **<=**