MATLAB Answers

read a matrix from a text file

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Nitish Reddy Kotkur
Nitish Reddy Kotkur on 20 Oct 2019
Edited: per isakson on 21 Oct 2019
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
KALYAN ACHARJYA on 20 Oct 2019
Please do attach output1.txt file.
Nitish Reddy Kotkur
Nitish Reddy Kotkur on 20 Oct 2019
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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Answers (2)

Stephan
Stephan on 21 Oct 2019
A = readcell('output1.txt');
B = str2num(char(replace(split(string([A{:,1}]),']'),...
{'00', '10', '01', '11', '['},{'0 0', '1 0', '0 1', '1 1', ''})));

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Joe Vinciguerra
Joe Vinciguerra on 21 Oct 2019
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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