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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def error_per_row(self):
 """This function calculates the error of the design based on the differences between the predicted flow rate and the actual flow rate through the LFOM."""

        FLOW_lfom_error = np.zeros(self.n_rows)
        for i in range(self.n_rows):
            actual_flow = self.flow_actual(i, self.n_orifices_per_row)
            FLOW_lfom_error[i] = (((actual_flow - self.flow_ramp[i]) / self.flow_ramp[i]).to(u.dimensionless)).magnitude
        return FLOW_lfom_error