cosine_array_precomputation.cpp

Plaintext calculate_cosine_array(int n, int N, int start, int stop, CryptoContext<DCRTPoly> cc) {
	vector<int64_t> *cosines = new vector<int64_t>();
	for (int k = 0; k != N; k++) {
		if (k < start || k >= stop) {
			cosines->push_back(0);
			continue;
		}
		int cosVal = int(cos(((2 * pi * k * n) / N)) * 100); //FOR MORE ACCURATE RESULTS, INCREASE MULTIPLE OF 10
		cosines->push_back(cosVal);
	}
	Plaintext cosineArray = cc->MakePackedPlaintext(*cosines);
	return cosineArray;
}