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/* -*- c++ -*- */
/*
* Copyright 2014, 2017, 2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef MULTIPLY_MATRIX_H
#define MULTIPLY_MATRIX_H
#include <gnuradio/blocks/api.h>
#include <gnuradio/sync_block.h>
#include <cstdint>
namespace gr {
namespace blocks {
/*!
* \brief Matrix multiplexer/multiplier: y(k) = A x(k)
* \ingroup blocks
*
* This block is similar to gr::blocks::multiply_const_ff, the difference
* being it can handle several inputs and outputs, and the input-to-output
* relation can be described by the following mathematical equation:
* \f[
* \mathbf{y}(k) = \mathbf{A} \mathbf{x}(k) \, , \, y \in \mathbb{R}^N, \mathbf{x} \in
* \mathbb{R}^M, A \in \mathbb{R}^{N \times M} \f] \f$\mathbf{y}(k)\f$ and
* \f$\mathbf{x}(i)\f$ are column-vectors describing the elements on the input port at
* time step \f$k\f$ (this is a sync block with no memory).
*
* Examples for where to use this block include:
* - Switch matrices (i.e. switch which ports go where), assuming all ports run on the
* same rate
* - Simulation of static MIMO-Channels (in that case, \f$\mathbf{A}\f$ is the channel
* matrix)
* - Summing up streams with variable coefficients
*
* This block features a special tag propagation mode: When setting the tag propagation
* policy to gr::block::TPP_CUSTOM, a tag is propagated from input \f$k\f$ to output
* \f$l\f$, if \f$(A)_{l,k} \neq 0\f$.
*
* \section blocks_matrixmult_msgports_multiply_matrix Message Ports
*
* This block as one input message port (\p set_A). A message sent to this port will
* be converted to a std::vector<std::vector<T> >, and then passed on to set_A().
* If no conversion is possible, a warning is issued via the logging interface, and
* A remains unchanged.
*
* *Note*: It is not possible to change the dimension of the matrix after initialization,
* as this affects the I/O signature! If a matrix of invalid size is passed to the block,
* an alert is raised via the logging interface, and A remains unchanged.
*/
template <class T>
class BLOCKS_API multiply_matrix : virtual public gr::sync_block
{
public:
typedef boost::shared_ptr<multiply_matrix<T>> sptr;
/*!
* \param A The matrix
* \param tag_propagation_policy The tag propagation policy.
* Note this can be any
* gr::block::tag_propagation_policy_t
* value. In case of TPP_CUSTOM, tags are
* only transferred from input \f$k\f$ to
* output \f$l \iff (A)_{l,k} \neq 0\f$.
*/
static sptr make(std::vector<std::vector<T>> A,
gr::block::tag_propagation_policy_t tag_propagation_policy =
gr::block::TPP_ALL_TO_ALL);
//! Returns the current matrix
virtual const std::vector<std::vector<T>>& get_A() const = 0;
//! Sets the matrix to a new value \p new_A. Returns true if the new matrix was valid
//! and could be changed.
virtual bool set_A(const std::vector<std::vector<T>>& new_A) = 0;
std::string MSG_PORT_NAME_SET_A;
};
typedef multiply_matrix<float> multiply_matrix_ff;
typedef multiply_matrix<gr_complex> multiply_matrix_cc;
} // namespace blocks
} // namespace gr
#endif /* MULTIPLY_MATRIX_H */
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