read a matrix from a text file

Question

Nitish Reddy Kotkur 2019-10-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486354-read-a-matrix-from-a-text-file

编辑： per isakson 2019-10-21

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
   NaN   NaN
   NaN   NaN
   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]

what else changes can i make .

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KALYAN ACHARJYA 2019-10-20

Please do attach output1.txt file.

Nitish Reddy Kotkur 2019-10-20

output1.txt

i have attached the file

BTW this worked fine when every matrix row is in just one line but as size of matrix increases every row is being displaued in two or more lines thats when the problem arised

A = readmatrix('output1.txt','Whitespace',' []');

so what changes can i make to above code

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Answer 1

Joe Vinciguerra 2019-10-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486354-read-a-matrix-from-a-text-file#answer_397467

在 MATLAB Online 中打开

A = readmatrix('output1.txt'... % filename
    ,'LineEnding',{']'}... % defines ']' as the end of each row instead of a carriage return
    ,'Delimiter',{'[',' ','\r','\n'}... % define the remaining non-numeric characters as delimiters
    ,'ConsecutiveDelimitersRule','join'... % treat consecutive delimiters as one
    ,'LeadingDelimitersRule','ignore'... % ignore delimiters that start a line
    );

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Answer 2

Stephan 2019-10-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486354-read-a-matrix-from-a-text-file#answer_397428

在 MATLAB Online 中打开

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