Trying to Find a Value associated with another value

I have a data file that has two columns. In the first column I have a set of data the reads 1-2000 then there is a space and it begins again at 1. This repeats for 372 times. I am trying to determine how to write a script or a function so I can extract data associated with lets say the data for 150 in each of the sets. For example, Matlab ask for x and I input 150 my output is then every value the is on the same row as 150 in each of the 372 sets of data. PLEASE HELP!! I am new to Matlab and confused. Thanks

Answer 1

[Walter Roberson]

filestr = fileread('YourFile.txt');
matched_strs = regexp(filestr, '(?:^150\s+).*$', 'match', 'lineanchors', 'dotexceptnewline');
matched_vals - str2double(matched_strs);

[Nakarsha]

Okay what do I need to do after I have entered the last line. How to display the values for 150

[Walter Roberson]

disp(matched_vals)

[Nakarsha]

I types the last command you gave me and it return just another >>. Did I do something wrong or am I missing some more commands

[Nakarsha]

It finally said 'Not enough memory to read file contents: Java heap space'