Wolfram Mathematica 中处理大数据文件的方法 [英] Way to deal with large data files in Wolfram Mathematica

问题描述

我想知道是否有办法在 Mathematica 中处理大文件?目前我有一个大约 500Mb 的文件，其中包含表数据.

I wonder if there exists way to work with large files in Mathematica ? Currently I have a file about 500Mb with table data.

Import["data.txt","Table"];

什么是替代方式?

推荐答案

使用 OpenRead["file"] 它为您提供了一个 InputStream 对象，您可以在该对象上使用 Read[stream].根据数据文件的格式，您可能需要在 Read 中设置自定义选项值[] 用于 RecordSeparators.

Use OpenRead["file"] which gives you an InputStream object on which you can use Read[stream]. Depending on the formatting of the data file you may need to set custom option values in Read[] for RecordSeparators.

示例:

In[1]:= str = OpenRead["ExampleData/USConstitution.txt"]    
Out[1]= InputStream["ExampleData/USConstitution.txt", 24]   

In[2]:= Read[str, Word]    
Out[2]= "We"    
In[3]:= Read[str, Word]
Out[3]= "the"    
In[4]:= Read[str, Record]
Out[4]= "People of the United States, in Order to form a more perfect Union,"

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