reading large text files into matrix

Question

Nitish Reddy Kotkur 2019-10-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486406-reading-large-text-files-into-matrix

回答： Stephan 2019-10-21

output1.txt

在 MATLAB Online 中打开

im trying to read a text file containing matrix

A = readmatrix('output1.txt','Whitespace',' []'); when i execute it

its displaying

NaN NaN

here output1.txt file contains data in the given manner

[[0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
  1 0 0 0 0 0 0 0 0 0 0 0 0 0]
 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0]
 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0]
 [1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 1 0 1]
 [0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0]
 [0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  0 0 0 0 0 0 0 0 0 0 0 0 0 0]]-50*50

what else changes can i make .

BTW it worked fine when matrix size is low i.e when every row of matrix is displayed in single line but as size of matrix increases single row is being displayed in multiple lines thats when problem arised.

i have attached the text file.

can some one modfy this A = readmatrix('output1.txt','Whitespace',' []');

so it can read matrix from the file irrespective of how large it is.

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dpb 2019-10-20

If going to do it that way, though, might as well just use .mat file format.

It's not clear the "why" behind this scheme so hard to generalize best solution -- but the one started down is probably not it.

Turlough Hughes 2019-10-20

I somehow doubt the data was generated in matlab. My comment is just to demo how easy it is to read data similar to Nitish's if it's formatted beforehand.

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Answer 1

Stephan 2019-10-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486406-reading-large-text-files-into-matrix#answer_397439

在 MATLAB Online 中打开

As already stated in the other question you asked with the same content, a possible way is:

A = readcell('output1.txt');
B = str2num(char(replace(split(string([A{:,1}]),']'),...
    {'00', '10', '01', '11', '['},{'0 0', '1 0', '0 1', '1 1', ''})));