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SignalSpace.cpp
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SignalSpace.cpp
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/**
* @file SignalSpace.cpp
* @brief
* @author Wei-Ning Huang (AZ) <aitjcize@gmail.com>
*
* Copyright (C) 2010 - Wei-Ning Huang (AZ) <aitjcize@gmail.com>
* All Rights reserved.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "SignalSpace.h"
#include <cassert>
#include <cstdio>
#include <cmath>
Signal SignalSpace::get_signal_at_coordinate(double x, double y)
{
return Signal(sqrt(x * x + y * y), freq, -atan(y / x));
}
Signal SignalSpace::inner_product(const Signal& a, const Signal& b,
double t_s, double t_e,
double dt, int cnt)
{
assert(t_e > t_s);
double t = 0.0, sum = 0.0;
int i = 0, len = 0;
Signal c(1 / dt, t_e - t_s);
len = c.get_len();
for (t = t_s, i = 0; t < t_e; t += dt, ++i) {
if (cnt && i % cnt == 0)
sum = 0.0;
sum += a.at_t(t) * b.at_t(t) * dt;
if (i < len)
c[i] = sum;
}
return c;
}