利用GPU做代数运算的Dirext版本；

很有名的GPU编程例子（引自siggraph上的论文）：这里使用了图形硬件上的矩阵和向量表达，繁杂的矩阵运算都在GPU上进行。对于想利用GPU做并行数值计算的人一定会有帮助~

-Make use of GPU computing Dirext version of algebra　well-known examples of GPU programming (a quote from the siggraph paper): here the use of the graphics hardware on the expression of matrix and vector, complex matrix calculation carried out in the GPU. Do want to use the GPU for parallel numerical calculation must be helpful ~