added [mtx_spherical_radial], the radial functions of the spherical base-solutions

svn path=/trunk/externals/iem/iemmatrix/; revision=12577

1 files changed, 26 insertions, 0 deletions

diff --git a/src/mtx_spherical_harmonics/sph_radial.h b/src/mtx_spherical_harmonics/sph_radial.h
new file mode 100644
index 0000000..43661ce
--- /dev/null
+++ b/src/mtx_spherical_harmonics/sph_radial.h
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+/*
+ * Recursive computation of (arbitrary degree) spherical Bessel/Neumann/Hankel functions, 
+ * 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, 2007.
+ *
+ * This code is published under the Gnu General Public License, see
+ * "LICENSE.txt"
+ */
+
+#ifndef __SPH_RADIAL_H__
+#define __SPH_RADIAL_H__
+
+void sphBessel (double x, double *y, int n);
+
+void sphNeumann (double x, double *y, int n);
+
+void sphBesselDiff (double x, double *y, int n);
+
+void sphNeumannDiff (double x, double *y, int n);
+
+#endif  // __SPH_RADIAL_H__