Pegah - 7 months ago 58

Java Question

I am trying to find a java code to compute the least squares solution (x) in the Ax=b equation.

Suppose that

`A = [1 0 0;1 0 0];`

b = [1; 2];

x = A\b

returns the

`x =`

1.5000

0

0

I found Class LeastSquares,

`public LeastSquares(double[] a, double[] b, int degree)`

but in the input both A and B are one dimensional arrays, however, in above example, A is a matrix and B is an array.

In Class NonNegativeLeastSquares

`public NonNegativeLeastSquares(int M, int N, double a[][],double b[])`

A is a matrix and B is an array, but the description of the class says that it finds an approximate solution to the linear system of equations Ax = b, such that ||Ax - b||2 is minimized, and such that x >= 0. Which means that x must be always positive.

I need a similar class as NonNegativeLeastSquares, however with out the x>=0 constraint.

Could someone please help me?

thanks a lot.

Source (Stackoverflow)