python矩阵numpy库

代码说明：

[](https://travis-ci.org/numpy/numpy)  NumPy is the fundamental package needed for scientific computing with Python. This package contains:    * a powerful N-dimensional array object    * sophisticated (broadcasting) functions    * tools for integrating C/C++ and Fortran code    * useful linear algebra, Fourier transform, and random number capabilities. It derives from the old Numeric code base and can be used as a replacement for Numeric. It also adds the features introduced by numarray and can be used to replace numarray. More information can be found at the website: * http://www.numpy.org After installation, tests can be run (if ``nose`` is installed) with:     python -c "import numpy; nu