Function nrm2_subrow (o2scl_cblas)

O2scl : Function List

template<class mat_t, class fp_t>
fp_t o2scl_cblas::nrm2_subrow(const mat_t &M, const size_t ir, const size_t ic, const size_t N)

Compute the norm of a subrow of a matrix.

Given the matrix X, define the vector x as the row with index ir. This function computes the norm of the part of x from column ic to column (inclusive). All other elements in x are not referenced.

Note

The suffix “2” on the function name indicates that this computes the “2-norm”, not that the norm is squared.