i have a parameter matrix and an observed matrix of same size. in some cells of the observed matrix are nans, these are fine but they signify that i shouldn’t model with those cells in the matrixes. Because i want my code to be as efficient as possible I want to convert the two matrixes to vectors and then model their relationship in vectorized fashion. so if i initialize a vector and then go through the parameter matrix and set values in the vector to be equal to cells in the matrix can i use the vector to model the values in the matrix cell? will they in effect point to the same space in memory?