if(flag = 0 && touch >= touchroom * 0.9) {P1OUT &= ~BIT4; P1OUT |= BIT5; __delay_cycles(200); flag = 0;} // set motor in FW direction if(flag = 1 && touch <= touchroom * 0.7) {P1OUT |= BIT4; P1OUT &= ~BIT5; __delay_cycles(200); flag = 1;} // set motor in RV direction

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.