Tagging Test Post

Publicity
1

Trying to tag without picking a category. Looks like it doesn’t work. Picked publicity, but we probably need one that covers the Discourse interface itself, or at least a catch-all.

2

By the way, @syclik, what’s with all the badges? We don’t need no - stinkin’ badges :stuck_out_tongue_closed_eyes:

3

just fyi, I’m going to get rid of the “tagging” tag. I really want to keep tags and categories down to a minimum. There shouldn’t be a maze of options just to post.

4

Agreed. But you should have some wider categories to catch things we didn’t think of.

5

I just added a “General” category.

6

How about “bug” and “feature request” as well, or does that all fall under “Interfaces”?

7

Those definitely fall under interfaces. We should add those tags, huh?

Bugs don’t exist in the ether. Nor do feature requests. They need to be attached to something – either an interface, the Stan language, the math library. But something.

8

Testing code markup. Would be nice to have something like crayon for wordpress.

#include <RcppEigen.h>
#include <algorithm> 

// [[Rcpp::depends(RcppEigen)]]

using namespace Rcpp;

using Eigen::Map;            // 'maps' rather than copies 
using Eigen::MatrixXd;       // variable size matrix, double precision
using Eigen::VectorXd;      // variable size vector, complex double precision
using Eigen::EigenSolver;    // general real eigenvalue solvers

const double tol = 1E-12;


// [[Rcpp::export]]
bool Eigentest(Map<MatrixXd> M) {
  EigenSolver<MatrixXd> es(M);
  VectorXd E = es.eigenvalues().real();
  return (E.maxCoeff() < tol);
}

// [[Rcpp::export]]
bool MMULT(MatrixXd M) {
  std::size_t n = M.rows();
  MatrixXd A = M;
  int i = 0;
  do {
    A *= M;
    ++i;
  } while (A.sum() > tol && i < n);
  return(A.sum() < tol);
}
9

Really happening place y’all have here, @syclik :stuck_out_tongue_closed_eyes: