<p>Thanks for the quick response!</p>

<p>Looks like the size is ok:<br>
x: 3069x1; y: 3069x1.</p>

<p>Rerunning with the debugging symbols gives:<br>
==9284== Process terminating with default action of signal 11 (SIGSEGV)<br>
==9284==  Access not within mapped region at address 0xFFF001000<br>
==9284==    at 0x5017C82: mlpack::regression::LogisticRegressionFunction::Evaluate(arma::Mat const&amp;) const (logistic_regression_function.cpp:80)</p>

<p>Line 80 is:<br>
77 for (size_t i = 0; i &lt; responses.n_elem; ++i)<br>
78  {<br>
79    if (responses[i] == 1)<br>
80      result += log(sigmoid[i]);<br>
81    else<br>
82      result += log(1.0 - sigmoid[i]);<br>
83  }</p>

<p>so it seems sigmoid, defined earlier in the function, is a different length to responses?</p>

<p>If that doesn't help, I can provide a minimal working example?</p>

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