LSFit 4 variables  Chose a power 1 to 5.
  Provide data in form below to get the least square polynomial
  fit of your data. Or, click on Browse and get your data from a file.

  x,y,z,t denote independent variables, u denotes output
  
  u = c0 + c1*x + c2*y + c3*z + c4*t               for first power,  at least 5 data
  u = c0 + c1*x + c2*y + c3*z + c4*t + c5*x*x + c6*x*y +
      c7*x*z + c8*x*t + c9*y*y + c10*y*z + c11*y*t +
      c12*z*z + c13*z*t + c14*t*t                  for second power, at least 15 data
  u = c0 + c1*x + c2*y + c3*z + c4*t + c5*x*x + c6*x*y +
      c7*x*z + c8*x*t + c9*y*y + c10*y*z + c11*y*t +
      c12*z*z + c13*z*t + c14*t*t +
      c15*x*x*x + c16*x*x*y + c17*x*x*z + c18*x*x*t +
      c19*x*y*y + c20*x*y*z + c21*x*y*t + c22*x*z*z +
      c23*x*z*t + c24*x*t*t + c25*y*y*y + c26*y*y*z +
      c27*y*y*t + c27*y*z*z + c28*y*z*t + c29*y*t*t +
      c30*z*z*z + c31*z*z*t + c33*z*t*t + c33*t*t*t for third power,  at least 34 data
      c0 to c69                                     for fourth power, at least 70 data
      c0 to c125                                    for fourth power, at least 126 data

  
 power 

enter your data  x  y  z  t u  each floating point number followed by a space
fit 
 

data  
compute from data entered