应用正交匹配追踪求解等式y=Ax,要求：

待求x是稀疏向量，A为高斯随机矩阵

调用形式：x = myomp(A,y,err)

A -线性投影矩阵；

y -投影向量

err -所需精度-apply Orthogonal matching pursuit to solve the equation y = Ax,

requirements:

the unknown x is sparse vector,

A is a Gaussian random.

calling form: x = myomp (A, y, err)　

A - linear projection matrix　

y - projection vector　

err - desired accuracy.