Read file

Hi all,

probably a very simple question..I need to read a text file consisting of a list of vectors with this format:

skip the first 22 line and then (x y z) (x y z) (x y z) ... (x y z)

there are 263853 line. How can i do that??

thanks for any help

andrea

Answer 1

[Jan]

The description of the file format is not exact enough. I'll show you a method for a well defined format and I assume you can adjust it to your needs:

I assume the file looks like this:

Header line 1
...
Header line 22
(0.1 0.2 0.3)
(0.17 19.5 231)
...   <263853 of such lines>

This can be solved by TEXTSCAN or more low-levelish:

FID = fopen(FileName, 'r');
if FID <= 0, error('Cannot open file'); end
for iSkip = 1:22
  dummy = fgetl(FID);
end
Data = fscanf(FID, '(%g %g %g)\n');
Data = transpose(reshape(Data, 3, []));
fclose(FID);

[Andrea Ferrari]

thanks Jan. It runs

andrea

[Jan]

Thanking is very polite. Accpeting an answer is helpful for others in addition.

Answer 2

[Andrea Ferrari]

sorry

all vector are in column (not along a line).

andrea

Answer 3

[Matt Tearle]

Or, using textscan (as Jan mentioned):

FID = fopen(FileName, 'r');
if FID <= 0, error('Cannot open file'); end
Data = textscan(FID, '(%f %f %f)','headerlines',22);
x = Data{1};
y = Data{2};
z = Data{3};
fclose(FID);