Python几种读取mat格式数据的方法

最新推荐文章于 2025-05-29 21:43:40 发布

Bill_zhang5

最新推荐文章于 2025-05-29 21:43:40 发布

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分类专栏： Python 数据预处理医疗数据挖掘文章标签： mat数据处理心电数据读取

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本文介绍了如何使用Python读取MATLAB格式的数据文件。主要通过三种方法实现：使用scipy库加载.mat文件；利用mat4py库进行数据转换；采用h5py库结合Pandas进行数据操作。

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matlab中使用的数据一般会以mat的格式存储，用python读取有以下几种方法

1、使用scipy，具体实现如下：

import scipy.io as scio
import pandas as pd
data_path="train.mat"
#Method 1
data = scio.loadmat(data_path)
data_train_label=data_train.get('label')#取出字典里的label
data_train_data=data_train.get('data')#取出字典里的data

可以参考以下链接：https://docs.scipy.org/doc/scipy/reference/io.html

2、mat4py库：
功能：将Matlab 数据导入为基本的Python数据类型。矩阵是以行为组的存储方式(使用列表的列表)。 Matlab结构体Struct和元胞Cell 使用Python的词典表示。

import mat4py

student1 = mat4py.loadmat('student.mat')

student1 = student1['student']

print type(student1)  #dict 

print ','.join(['%s' % key for key,val in student1.iteritems()]) # age,score,name,sex

Load data from MAT-file

The function loadmat loads all variables stored in the MAT-file into a simple Python data structure, using only Python’s dict and list objects. Numeric and cell arrays are converted to row-ordered nested lists. Arrays are squeezed to eliminate arrays with only one element. The resulting data structure is composed of simple types that are compatible with the JSON format.

Example: Load a MAT-file into a Python data structure:

data = loadmat('datafile.mat')
The variable data is a dict with the variables and values contained in the MAT-file.

Save Python data structure to a MAT-file

Python data can be saved to a MAT-file, with the function savemat. Data has to be structured in the same way as for loadmat, i.e. it should be composed of simple data types, like dict, list, str, int and float.

Example: Save a Python data structure to a MAT-file:

savemat('datafile.mat', data)

链接：https://pypi.python.org/pypi/mat4py/0.4.0

3、h5py

from pandas import Series,DataFrame
import pandas as pd
import numpy as np
import h5py
datapath = 'data10.mat'
file = h5py.File(datapath,'r')
def Print(name):print(name)
data = file['CH01'][:]
dfdata = pd.DataFrame(data)
datapath1 = 'data3.txt'
dfdata.to_csv(datapath1)

注意：可能会出现打不开文件问题，可以参考有关链接：http://docs.h5py.org/en/latest/quick.html