def zoom(self, factor):
        """Zoom in or out by a percentage; negative is out."""
        x_min, x_max, y_min, y_max = plt.axis()
        x_delta = (x_max - x_min) * 100 / factor
        y_delta = (y_max - y_min) * factor / 100
        plt.axis((x_min + x_delta, x_max - x_delta,
                  y_min + y_delta, y_max - y_delta))
dataset/ETHPy150Open cgarrard/osgeopy-code/ospybook/ospybook/simplevectorplotter.py/SimpleVectorPlotter.zoom/swapped operands of `/`