Polyfit with three variable

[swagata Mukherjee]

Hi,

I need help with linear regression with three variables.

I was running the following code:

   N_Liner=1; 
    P_Liner=polyfit(G,Temp,I_PV,N_Liner)

getting the following error "error: polyfit: N must be a non-negative integer".

Is there any way out?

Regards,

Swagata