diff options
author | Anton Khirnov <anton@khirnov.net> | 2014-12-01 12:57:45 +0100 |
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committer | Anton Khirnov <anton@khirnov.net> | 2014-12-01 12:57:45 +0100 |
commit | e7917b740e8907476d9fb440ba1c9cafb7bafcaa (patch) | |
tree | 57c8e7259706962454ddf2d77056ef18e79589a8 /brill_data.h | |
parent | 7c6e3b743508159bef41a3d2f503809acad1c2e6 (diff) |
Add a function for evaluating the metric.
Diffstat (limited to 'brill_data.h')
-rw-r--r-- | brill_data.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/brill_data.h b/brill_data.h index 85e1aac..a3f897b 100644 --- a/brill_data.h +++ b/brill_data.h @@ -161,3 +161,28 @@ int bd_eval_psi(BDContext *bd, const double *rho, int nb_coords_rho, const double *z, int nb_coords_z, const unsigned int diff_order[2], double *psi); + +/** + * Evaluate the 3-metric γ_ij at the specified rectangular grid (in cylindrical + * coordinates { ρ, z, φ }). + * + * @param bd the solver context + * @param rho the array of ρ coordinates. + * @param nb_coords_rho the number of elements in rho. + * @param z the array of z coordinates. + * @param nb_coords_z the number of elements in z. + * @param comp the component of the metric to evaluate. + * @param diff_order the order of the derivatives of the metric to evaluate. The first element + * specifies the derivative wrt ρ, the second wrt z. I.e. diff_order = { 0, 0 } + * evaluates the metric itself, diff_order = { 0, 1 } evaluates ∂γ/∂z etc. + * @param out the array into which the values of the metric will be written. The metric + * is evaluated on the grid formed by the outer product of the rho + * and z vectors. I.e. out[j * nb_coords_rho + i] = γ_comp[0]comp[1](rho[i], z[j]). + * The length of out must be nb_coords_rho * nb_coords_z. + * + * @return >= 0 on success, a negative error code on failure. + */ +int bd_eval_metric(BDContext *bd, const double *rho, int nb_coords_rho, + const double *z, int nb_coords_z, + const unsigned int comp[2], const unsigned int diff_order[2], + double *out); |