You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mlphdotv.m
    path of file: ./repos/pcm/matlab/lib/netlab3_3
    
    the code of the file until where you have to start completion: function hdv = mlphdotv(net, x, t, v)
%MLPHDOTV Evaluate the product of the data Hessian with a vector. 
%
%	Description
%
%	HDV = MLPHDOTV(NET, X, T, V) takes an MLP network data structure NET,

    
function hdv = mlphdotv(net, x, t, v)
%MLPHDOTV Evaluate the product of the data Hessian with a vector. 
%
%	Description
%
%	HDV = MLPHDOTV(NET, X, T, V) takes an MLP network data structure NET,
%	together with the matrix X of input vectors, the matrix T of target
%	vectors and an arbitrary row vector V whose length equals the number
%	of parameters in the network, and returns the product of the data-
%	depend