Efficient way of indexing

General
1

Hi there, I have a noob question. What is an efficient way of indexing for a vector of vectors? Let’s say we have the following toy example. Is “sensitivity_2_3” more efficient or “sensitivity_2_and_3”?

    data {

    }
    parameters {
        vector<lower=0.0, upper=1.0>[4] labeler_sens[3];
        
    }
    transformed parameters {
        real sensitivity_2_3 = labeler_sens[2][3];
        real sensitivity_2_and_3 = labeler_sens[2, 3];
    }
    model {
      for (i in 1:4) {
        labeler_sens[:, i] ~ beta(10 * 0.2, 10 * 0.8);
      }
    }
2

It think both result in the same C++ code.

2 Likes
3

thanks @bgdoori for your help