How can I use data from a text file to draw a 3D plot ?

The text file is an output file generated as a result of some simulation and it contains numbers and alphabets , how do i tell MATLAB to take only some points of interest to make a plot? and ignore other text.. (The text file is a big one and contains large amount of data)

Please guide with the functions i should try, i have tried "load" for the file and then 'index' to specify rows but it is not working. P.S. I am new to MATLAB.

Thank you !

[Walter Roberson]

Please show some sample of the text to be examined, indicating which values are to be read in.

[asdf fdsa]

This is the file i need to use. And i want to access some specific rows or columns each time.

[Walter Roberson]

Some specific rows or columns of which par of the input?

[asdf fdsa]

I want to use the boundaries given in this text file (numbers only) to creat a 3D shape.