Reading data with specific format

I have a text file something similar to below.

Time

10

Atoms

100

1 2 .1 .3 .4

2 1 .4 .6 .7

3 1 .5 .6 .8

Time

20

Atoms

100

1 2 .5 .6 .4

2 1 .4 .6 .9

3 1 .5 .6 .4

Time

30

Atoms

100

1 2 .5 .6 .4

2 1 .4 .7 .9

3 1 .7 .6 .1

Time

............

............

The text file is repeated for many times. Now I want to extract the data which is in the format of '%f%f%f%f%f'. i.e I need to generate an matrix as below.

[1 2 .1 .3 .4

2 1 .4 .6 .7

3 1 .5 .6 .8

1 2 .5 .6 .4

2 1 .4 .6 .9

3 1 .5 .6 .4

1 2 .5 .6 .4

2 1 .4 .7 .9

3 1 .7 .6 .1

............

...........]

How to do that without using loop?

Thanks

Answer 1

[Star Strider]

It’s not possible to do it without a loop. The reason is that you have to do something similar to:

fidi = fopen( ... ,'rt');
k1 = 1;
while ~feof(fidi)
    D{k1} = textscan(fidi, '%f%f%f%f', 'HeaderLines',4, 'CollectOutput',true);
    fseek(fidi, 0, 0)
    k1 = k1 + 1;
end
fclose(fidi)

The code will stop when it hits a text line, then with the fseek call it will advance to the next line, skip it and the next 3 header lines, then continue through until it encounters a valid ‘end-of-file’ indicator, then stop. If there is no valid ‘end-of-file’ indicator, this becomes an infinite loop, so be mindful of that possibility.

NOTE — This is UNTESTED CODE. It should work with appropriate modifications. You may need to add additional name-value pair arguments to the textscan call to make it work with your file.

[Nalaka Samaraweera]

Excellent, Thank you very much

[Star Strider]

My pleasure!