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Fast matrix generation in python, including python style and matlab style support

Project description

MatGen

介绍

在 Python 中快速构建矩阵的方法。

软件功能

基于 numpy.stack 的构造

提供了两个语法糖类,分别是 VerticalStackerHorizontalStacker,以及对应的一个实例,分别是 v_h_。对 v_h_ 进行 __getitem__ 访问,效果完全等同于 numpy.vstacknumpy.hstack

示例

>>>v_[np.array([1,2,3]), h_[[[4,5],[4,5]], [[6],[6]]], np.zeros((2,3)), np.eye(3)]

[[1. 2. 3.]
 [4. 5. 6.]
 [4. 5. 6.]
 [0. 0. 0.]
 [0. 0. 0.]
 [1. 0. 0.]
 [0. 1. 0.]
 [0. 0. 1.]]

基于 MATLAB 风格的解释器

提供一个函数 M_ 通过解析字符串的形式来构建矩阵,支持部分 MATLAB 语法和 Python 语法。该字符串的组成形式如下:

[* * ... *;
 * * ... *;
     ...  ;
 * * ... *]

其中 * 代表一个元素,该元素可以是一个数字,可以是上述的矩阵(矩阵嵌套),还可以是一个 python 表达式。注意,如果该 python 表达式包含 [*] 符号,会使解释器产生误解(这是由于两种语言风格混合在一起导致的),例如 arr[1,2],解释器不知道这里是两个元素还是对 arr 的切片。如果你想表达这是一个 python 表达式,请用括号将它们包括起来,即写成 (arr[1,2])

示例

>>>M_('[1 2 3; np.zeros((2, 2)), np.array([[1, 2]]).T]')

[[1. 2. 3.]
 [0. 0. 1.]
 [0. 0. 2.]]

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