1 files changed, 117 insertions, 0 deletions
diff --git a/tests/gradient_panel_x.c b/tests/gradient_panel_x.c
new file mode 100644
index 00000000..460044da
--- /dev/null
+++ b/tests/gradient_panel_x.c
@@ -0,0 +1,117 @@
+/*
+ * gradient_panel_x.c
+ *
+ * Check gradients for prediction refinement
+ *
+ * Copyright © 2012-2023 Deutsches Elektronen-Synchrotron DESY,
+ *                       a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *   2012-2023 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CrystFEL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+
+#include <image.h>
+#include <geometry.h>
+#include <predict-refine.h>
+
+#include "gradient_check_utils.h"
+
+
+int main(int argc, char *argv[])
+{
+	struct image image;
+	struct reflpeak *rps;
+	int n_refls;
+	double **before;
+	double **after;
+	int i;
+	int n_wrong_r = 0;
+	int n_wrong_fs = 0;
+	int n_wrong_ss = 0;
+	int n_wrong_obsr = 0;
+	int fail = 0;
+	double step = 0.1;  /* Pixels */
+
+	rps = make_test_image(&n_refls, &image);
+
+	before = make_dev_list(rps, n_refls, image.detgeom);
+	image.detgeom->panels[0].cnx += step;
+	update_predictions(image.crystals[0]);
+	after = make_dev_list(rps, n_refls, image.detgeom);
+
+	for ( i=0; i<n_refls; i++ ) {
+
+		double calc[3];
+		double obs[3];
+
+		calc[0] = r_gradient(GPARAM_DET_TX, rps[i].refl,
+		                     crystal_get_cell(image.crystals[0]),
+		                     image.lambda);
+
+		calc[1] = fs_gradient(GPARAM_DET_TX, rps[i].refl,
+		                      crystal_get_cell(image.crystals[0]),
+		                      rps[i].panel);
+
+		calc[2] = ss_gradient(GPARAM_DET_TX, rps[i].refl,
+		                      crystal_get_cell(image.crystals[0]),
+		                      rps[i].panel);
+
+		obs[0] = (after[0][i] - before[0][i]) / step;
+		obs[1] = (after[1][i] - before[1][i]) / step;
+		obs[2] = (after[2][i] - before[2][i]) / step;
+
+		/* Gradient of excitation error w.r.t. panel should be zero */
+		if ( fabs(obs[0]) > 1e-12 ) n_wrong_obsr++;
+		if ( fabs(calc[0]) > 1e-12 ) n_wrong_r++;
+
+		/* Panel gradients should be within tolerance */
+		if ( fabs(obs[1] - calc[1]) > 1e-6 ) n_wrong_fs++;
+		if ( fabs(obs[2] - calc[2]) > 1e-6 ) n_wrong_ss++;
+	}
+
+	if ( n_wrong_r > 0 ) {
+		fprintf(stderr, "%i out of %i R gradients were wrong.\n",
+		        n_wrong_r, n_refls);
+		fail = 1;
+	}
+
+	if ( n_wrong_fs > 0 ) {
+		fprintf(stderr, "%i out of %i fs gradients were wrong.\n",
+		        n_wrong_fs, n_refls);
+		fail = 1;
+	}
+
+	if ( n_wrong_ss > 0 ) {
+		fprintf(stderr, "%i out of %i ss gradients were wrong.\n",
+		        n_wrong_ss, n_refls);
+		fail = 1;
+	}
+
+	if ( n_wrong_obsr > 0 ) {
+		fprintf(stderr, "%i out of %i observed R gradients were not zero as expected\n",
+		        n_wrong_obsr, n_refls);
+		fail = 1;
+	}
+
+	return fail;
+}