how to read a textfile that contain an array of text values into matrix

I have a textfile that contain tab delimited hexadecimal values and I would like to transfer the values into an array with each element will keep a value in the table (attached)

Answer 1

[Massimo Zanetti]

Here is it, you should know how many columns your data span (I guessed by reading your file they are 25):

%open file
fname = 'PowerUpRampSpeed_1.txt';
fileID = fopen(fname);
%read formatted data as strings of 2 characters
A = textscan(fileID,'%2c','Delimiter','\t');
%reshape the vector to matrix size
cols = 25;
A = reshape( hex2dec(char(A)) , cols , [])';
%close file
fclose(fname);

Now, A is your matrix read into Matlab.

Answer 2

[Jan]

fname = 'file.txt';
fid   = fopen(fname, 'r');
if fid == -1
  error('Cannot open file for reading: %s', fname);
end
A = fscanf(fid, '%2x', [25, inf]).';
fclose(fid);

The conversion of hexadecimal number is much faster in fscanf/sscanf then by hex2dec.

Answer 3

[Yoav Weizman]

Thanks Jan and Massimo

I managed to find the following solution and it worked

array=reshape(textread('filename','%s'),200,32);

I was wondering if there is any reason to favor textscan or fscanf solutions?

[Jan]

textscan is more powerful, fscanf is faster. If you have a running textscan version and import some dozens of files only, spending 15 minute to create a faster fscanf version is most likely a waste of time - a pre-mature optimization.

[Walter Roberson]

Your solution leaves the values as text. Were you wanting a text array, or were you wanting a numeric array?

[Walter Roberson]

Oddly, at least on OS-X, textread() is not able to read files with the original name PowerUpRampSpeed_1µs.txt claiming they do not exist . I will be filing a bug report on that.

Answer 4

[Walter Roberson]

S = fileread('PowerUpRampSpeed_1µs.txt');
temp = regexp( regexp(S, '\r?\n', 'split'), '\W+', 'split');
output = vertcat(temp{:});

The result will be a 32 x 200 cell array of character vectors; hex values will not be converted to numeric.