Kyle_HW12 - Conjugate Gradients

The program should take a positve-definite symmetric matrix
and a vector in a file and return a solution vector in
vector format: printing the vector size before the vector
data.

USAGE

> ./kyle_hw12 < input > out

The input file should contain two filenames.  For example:

A.mat
x.vec
/* sample input file */

A sample input (sample) is provide along with vector (x.vec)
and matrix (A.mat) files.

VALIDATION

The program was tested by comparing the output of a 2x2 and
a 3x3 symmetric matrix (sample) with Mathematica's
LinearSolve function.