[mlpack-git] [mlpack/mlpack] unable to compile a sample program of covariance calculation (#781)
Marcus Edel
notifications at github.com
Thu Sep 8 10:53:51 EDT 2016
I guess you are using:
```
#include <mlpack/core.hpp>
// Convenience.
using namespace mlpack;
int main()
{
// First, load the data.
arma::mat data;
// Use data::Load() which transposes the matrix.
data::Load("data.csv", data, true);
// Now compute the covariance. We assume that the data is already centered.
// Remember, because the matrix is column-major, the covariance operation is
// transposed.
arma::mat cov = data * trans(data) / data.n_cols;
// Save the output.
data::Save("cov.csv", cov, true);
}
```
The output is saved in ``cov.csv``, if you like to print the output you could do:
```
Log::Info << cov << std::endl;
```
before:
``
data::Save("cov.csv", cov, true);
``
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