added [mtx_sh] for spherical harmonics evaluation.

svn path=/trunk/externals/iem/iemmatrix/; revision=10515

1 files changed, 31 insertions, 0 deletions

diff --git a/src/mtx_sh/sharmonics_normalization.h b/src/mtx_sh/sharmonics_normalization.h
new file mode 100644
index 0000000..f837233
--- /dev/null
+++ b/src/mtx_sh/sharmonics_normalization.h
@@ -0,0 +1,31 @@
+/*
+ * Recursive computation of (arbitrary degree) normalization constants
+ * for spherical harmonics, according to Gumerov and Duraiswami,
+ * "The Fast Multipole Methods for the Helmholtz Equation in Three Dimensions",
+ * Elsevier, 2005.
+ *
+ * Implementation by Franz Zotter, Institute of Electronic Music and Acoustics
+ * (IEM), University of Music and Dramatic Arts (KUG), Graz, Austria
+ * http://iem.at/Members/zotter, 2008.
+ *
+ * This code is published under the Gnu General Public License, see
+ * "LICENSE.txt"
+ */
+
+
+#ifndef _sharmonics_normalization_h__
+#define _sharmonics_normalization_h__
+#include <math.h>
+#include <stdlib.h>
+
+typedef struct _SHNorml_
+{
+   double *n;
+   size_t nmax;
+} SHNorml;
+
+SHNorml *sharmonics_normalization_new (const size_t nmax);
+
+void sharmonics_normalization_free (SHNorml *wn);
+
+#endif