llsq, a Python code which solves the linear least squares problem of finding the formula of a straight line y=a*x or y=a*x+b which minimizes the root-mean-square error to a set of N data points.


The computer code and data files described and made available on this web page are distributed under the MIT license


llsq is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

test_lls, a Python code which implements linear least squares (LLS) test problems of the form A*x=b.


  1. David Kahaner, Cleve Moler, Steven Nash,
    Numerical Methods and Software,
    Prentice Hall, 1989,
    ISBN: 0-13-627258-4,
    LC: TA345.K34.

Source Code:

Last revised on 29 August 2016.