Read Text File into a Matrix

I would like to be able to read a text file into matlab and turn it into a matrix. The text file would look like this:

%Joint Properties

% Format is %joint# x_coord y_coord xdof# ydof#

1 0 0 4 5

2 120 0 1 6

3 120 120 2 3

I would like to turn the numbers into a matrix. How would I do this?

Also, how would I then access a single column in this matrix?

Is there a way to have Matlab count the number of rows in the matrix?

Answer 1

[Oleg Komarov]

% read in data
fid = fopen('filepath');
data = textscan(fid,'%f%f%f%f','HeaderLines',2,'CollectOutput',1);
data = data{:};
fid = fclose(fid);

% retrieve column 1
data(:,1)

% Number of rows 
size(data,1)

I assumed the example of the text file doesn't have intervealing blank lines.

Oleg

[Samuel Maliva]

Please can you explain the meaning of line 3: data = data{:};

[Giulia Brusadin]

Might this work also with hexadecimal values? I have to register some mac address and they are represented by hex values

[L.J.]

Curly brackets extract data.

Answer 2

[Priya Shaji]

Hi I want to read txt files and plot in matlab using imshow