How to read a text file and only keep certain numbers?

Hi,

I have a text file which contains the information listed below: (similar format)

-------------------------------

Info1.txt

Number: 01

Graduation Year: 2005

Class: 1268

Age: 32

Info2.txt

Number: 02

Graduation Year: 2006

Class: 8640

Age: 31

Info3.txt

Number: 03

Graduation Year: 2005

Class: 5309

Age: 32

Info4.txt

Number: 04

Graduation Year: 2005

Class: 2954

Age: 32

----------------------------

I’m trying to write a Matlab code that reads this .txt file and gives me only the class numbers as a list:

1268

8640

5309

2954

Thanks a lot!

[Stephen23]

@cherrymath78: please edit your question and upload a copy of the file using the paperclip button.

You should change the names if they should not be released publicly.

Answer 1

[Robert]

Once you have the data in MATLAB ( fileread will do the trick) you can use regular expressions to find your data. Use MATLAB's regexp to search for consecutive digits that follow the string "Class: ".

str = fileread(fid); % Fixed based on comment below. Thanks, Walter!

classNums = regexp(str,'(?<=Class: )\d+','match')
classNums = str2double(classNums)

[Walter Roberson]

The fopen/fread/fclose can be replaced by

str = fileread('myFile.txt');