How can open and read .dat file?

A=[3  4  4  NaN  NaN  NaN  NaN  NaN;
   36  46  4  4  1  3  NaN  NaN;
   24  32  3  3  1  3  2  3;
   25  32  3  3  1  3  2  NaN];

I have stored this matrix as a .dat file using following code:

filename = sprintf('output.dat');
dlmwrite(filename, A, ' ' );

Now I want to open (fopen) this "output.dat" file in read mode and want to read data from this open file using fscanf. How can I do that?

any help would be greatly appreciated.

Thank you!

[Rik]

What did you try?

[SM]

The matrix A has been stored in output.dat file in my computer. Now I want to read data from the output.dat file using fopen and fscanf. I have used the following code:

fileID = fopen('output.dat','r');
result = fscanf(fileID,'%f')

It results single column array but I need the output in the following format:

result=[3  4  4  NaN  NaN  NaN  NaN  NaN;
   36  46  4  4  1  3  NaN  NaN;
   24  32  3  3  1  3  2  3;
   25  32  3  3  1  3  2  NaN];
or,
result=result={[3  4  4]; [36  46  4  4  1  3]; [24  32  3  3  1  3  2  3]; [25  32  3  3  1  3  2]};

Answer 1

[Walter Roberson]

result = load('output.dat');

[SM]

Appreciated! but I want in different way. I have explained in my comment about how I have tried to solve it. Could you proceed that way?

[Walter Roberson]

You cannot solve the problem using fscanf() unless you already know the number of columns in advance.

You can solve the problem by looking with fgets() or fgetl() to pull in one line at a time, and sscanf() that line, and check the lines for consistency of lengths.

You can also solve the problem with dlmread() or with textscan(). If you use textscan then you can pass in '' (empty string) as the format, which is an undocumented option that will figure out how many columns there are for numeric use.

You can also use readmatrix() for R2019b or later.

[Huy Le Van]

I can not read file.dat.

Do you replay follow email []@gamil.com

[Walter Roberson]

dat is not a fixed file format. It is used by many different programs for whatever data they have handy. You would need to know which program created the file to try to figure out what the file format is.