creating a matrix in matlab using a text file

type output.txt;
A = readmatrix('output.txt');
A

This is the output.txt file

[[1 2 2 0 0]
 [2 1 0 0 2]
 [2 0 1 2 0]
 [0 0 2 0 4]
 [0 2 0 4 0]]

A =
   NaN     2     2     0   NaN
   NaN     1     0     0   NaN
   NaN     0     1     2   NaN
   NaN     0     2     0   NaN
   NaN     2     0     4   NaN

but when i passed it as a input to A the first and last rows are displaying NaN.can someone rectify it.

Answer 1

[per isakson]

It's the brackets, [], that confuses Matlab. Try

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

I have R2018b so I can't test it.

Your output.txt looks more like the right hand side of an assignment in an m-function. Try

A = [[1 2 2 0 0]
     [2 1 0 0 2]
     [2 0 1 2 0]
     [0 0 2 0 4]
     [0 2 0 4 0]] 

in the command window (copy and paste).

[Nitish Reddy Kotkur]

so are the these [ ] and whitespace acting as delimiter?

[Jeremy Hughes]

Space ( char(32) ) is being used as the delimiter and [] are just being ignored.

I'd reccomend this for most cases where there are other characters since you don't have to specify what to omit.

A = readmatrix('output.txt','TrimNonNumeric',true);

[Nitish Reddy Kotkur]

now the ouput.txt is in this 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]
 A  =  readmatrix( 'output.txt', 'Whitespace',' []' ); 

when i ran this its displaying NaN- Can you help me with this