[mlpack-git] [mlpack/mlpack] segmentation fault in using sgd while increasing number of function (#607)

[Marcus Edel]

So without knowing the dimension of your data. My first guess is, that your data has less rows as 20.

The optimizer calls the ```Evaluation``` function for every sample (i = 0; i < NumFunctions), so if you write ```arma::mat Ri=data.row(i);```in your ```Evaluation``` function you should make sure, that you have enough samples.

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