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src/core/eemd_ex.cpp

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+/********************************************************
+ *  ██████╗  ██████╗████████╗██╗
+ * ██╔════╝ ██╔════╝╚══██╔══╝██║
+ * ██║  ███╗██║        ██║   ██║
+ * ██║   ██║██║        ██║   ██║
+ * ╚██████╔╝╚██████╗   ██║   ███████╗
+ *  ╚═════╝  ╚═════╝   ╚═╝   ╚══════╝
+ * Geophysical Computational Tools & Library (GCTL)
+ *
+ * Copyright (c) 2023  Yi Zhang (yizhang-geo@zju.edu.cn)
+ *
+ * GCTL is distributed under a dual licensing scheme. You can redistribute 
+ * it and/or modify it under the terms of the GNU Lesser General Public 
+ * License as published by the Free Software Foundation, either version 2 
+ * of the License, or (at your option) any later version. You should have 
+ * received a copy of the GNU Lesser General Public License along with this 
+ * program. If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * If the terms and conditions of the LGPL v.2. would prevent you from using 
+ * the GCTL, please consider the option to obtain a commercial license for a 
+ * fee. These licenses are offered by the GCTL's original author. As a rule, 
+ * licenses are provided "as-is", unlimited in time for a one time fee. Please 
+ * send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget 
+ * to include some description of your company and the realm of its activities. 
+ * Also add information on how to contact you by electronic and paper mail.
+ ******************************************************/
+
+/* Copyright 2013 Perttu Luukko
+
+ * This file is part of libeemd.
+
+ * libeemd 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 3 of the License, or
+ * (at your option) any later version.
+
+ * libeemd 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 libeemd.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../lib/core.h"
+#include "../lib/io.h"
+#include "../lib/algorithms.h"
+
+using namespace gctl;
+
+const size_t ensemble_size = 250;
+const unsigned int S_number = 4;
+const unsigned int num_siftings = 50;
+const double noise_strength = 0.2;
+const unsigned long int rng_seed = 0;
+std::string outfile = "eemd_example.out";
+
+// An example signal to decompose
+const size_t N = 1024;
+static inline double input_signal(double x) {
+	const double omega = 2*GCTL_Pi/(N-1);
+	return sin(17*omega*x)+0.5*(1.0-exp(-0.002*x))*sin(51*omega*x+1);
+}
+
+int main(int argc, char const *argv[]) try
+{
+	// Define input data
+    array<double> inp(N);
+	for (size_t i=0; i<N; i++)
+    {
+		inp[i] = input_signal((double)i);
+	}
+
+    // Run eemd
+	matrix<double> outp;
+    // This is just a warpper of the function eemd() from libeemd
+    // IMFs are stored in rows of the output matrix in the shape of M*N
+    eemd1d(inp, outp, 0, ensemble_size, noise_strength, S_number, num_siftings, rng_seed);
+
+    std::ofstream ofile;
+    open_outfile(ofile, outfile);
+
+    size_t M = outp.row_size();
+    for (size_t j=0; j<N; j++)
+    {
+        ofile << inp[j];
+		for (size_t i=0; i<M; i++)
+        {
+            ofile << " " << outp[i][j];
+		}
+		ofile << "\n";
+	}
+    ofile.close();
+    return 0;
+}
+catch(std::exception &e)
+{
+    GCTL_ShowWhatError(e.what(), GCTL_ERROR_ERROR, 0, 0, 0);
+}