public static double[] backSubst(double[][] R, double[] b) {
		int n = b.length;
		double[] x = new double[n];
		n--;

		/*
		//Filter 0 Rows
		int counterColumn = 0;

		for(int counterAllColumns = 0; counterAllColumns < n; counterAllColumns++) {
			boolean hasZeroColumn = true;
			for(int counterRows = 0; counterRows < n; counterRows++) {
				if(R[counterRows][counterAllColumns] != 0.0) {
					hasZeroColumn = false;
				}
			}
			if(hasZeroColumn) {
				n--;
				double[][] newR = new double[n][n];
				for(int row = 0; row < n;row++) {
					newR[counterColumn][row] = R[counterAllColumns][row];
				}
				counterColumn++;
				R = newR;

				counterAllColumns--;
			}
		}*/



		// j ist spalte
		// i ist zeile
		for (int i = n; i >= 0; i--) {
			double sum = b[i];
			for (int j = i + 1; j <= n; j++) {
				sum -= x[j] * R[i][j];
			}
			x[i] = R[i][i] == 0.0 ? 0.0 : sum / R[i][i];
		}

		return x;
	}