Mat::reshape is called incorrectly in EM::setTrainData (Bug #3674)

I am using openCV 2.4.9, compiled on a Win 7 64-bit box.

When using EM (em.cpp) with the option of starting with the E-step, one provides the initial means, covariance matrices, and weights. The variable weights is a number of clusters by 1 matrix/vector. In em.cpp, in the function EM::setTrainData, the variable weights is "reshaped" to a 1 x number of clusters vector using the function call

weights.reshape(1, 1)

Unfortunately, when the input is a number of clusters X 1 vector, this reshape does nothing, resulting in a bad initial weight vector (because subsequently the initial weights are computed based on the number of columns).

I also tested the Mat::reshape function independently, and I confirmed that the function call does nothing for a N X 1 vector/matrix.