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diff --git a/include/pdp_matrix.h b/include/pdp_matrix.h
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+++ b/include/pdp_matrix.h
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+/*
+ *   Pure Data Packet system implementation. matrix packet interface
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program 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 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef PDP_MATRIX_H
+#define PDP_MATRIX_H
+
+#include <stdio.h>
+#include <gsl/gsl_block.h>
+#include <gsl/gsl_vector.h>
+#include <gsl/gsl_matrix.h>
+#include <gsl/gsl_blas.h>
+#include <gsl/gsl_linalg.h> 
+
+#include "pdp_types.h"
+
+#define gsl_rows size1
+#define gsl_columns size2
+
+typedef struct _matrix
+{
+    /* meta data */
+    u32 type;                 /* float/double real/complex */
+    u32 rows;
+    u32 columns;
+
+    /* gsl structures: these will be cast to the correct type on use */
+    gsl_block  block;     /* gsl block meta data */
+    gsl_vector vector;    /* gsl vector meta data */
+    gsl_matrix matrix;    /* gsl matrix meta data */
+    gsl_permutation perm; /* permutation data for storing an LU decomposition */
+    int signum;           /* sign of permutation matrix */
+
+
+} t_matrix;
+
+#define PDP_MATRIX 7
+
+#define PDP_MATRIX_TYPE_RFLOAT 1
+#define PDP_MATRIX_TYPE_CFLOAT 2
+#define PDP_MATRIX_TYPE_RDOUBLE 3
+#define PDP_MATRIX_TYPE_CDOUBLE 4
+
+int pdp_packet_matrix_isvalid(int p);
+int pdp_packet_matrix_isvector(int p);
+int pdp_packet_matrix_ismatrix(int p);
+
+int pdp_packet_new_matrix(u32 rows, u32 columns, u32 type);
+int pdp_packet_new_matrix_product_result(CBLAS_TRANSPOSE_t TransA, CBLAS_TRANSPOSE_t TransB, int pA, int pB);
+void pdp_packet_matrix_setzero(int p);
+
+
+/* getters: returns 0 if type is incorrect */
+void *pdp_packet_matrix_get_gsl_matrix(int p, u32 type);
+void *pdp_packet_matrix_get_gsl_vector(int p, u32 type);
+int pdp_packet_matrix_get_type(int p);
+
+
+/* type transparent matrix operations */
+
+/* blas wrappers */
+
+/* C += scale op(A) op(B) */
+int pdp_packet_matrix_blas_mm(CBLAS_TRANSPOSE_t TransA, CBLAS_TRANSPOSE_t TransB, 
+			      int pA, int pB, int pC,
+			      float scale_r, float scale_i);
+/* c += scale op(A) b */
+int pdp_packet_matrix_blas_mv(CBLAS_TRANSPOSE_t TransA,
+			      int pA, int pb, int pc, 
+			      float scale_r, float scale_i);
+
+/* other gsl wrappers */
+int pdp_packet_matrix_LU(int p_matrix);
+int pdp_packet_matrix_LU_to_inverse(int p_matrix);
+int pdp_packet_matrix_LU_solve(int p_matrix, int p_vector);
+
+
+#endif