Use a txt file (X, Y, Z), with random values for X and Y, to get a new file X and Y
I have a big 3D geometric txt file (X, Y, Z), about 50k lines, but it's not perfectly structured, I mean X and Y are picked at random. I want to create a new file based on the data of the first file, where the values of X and Y are predefined, so the program calculates the new values of Z, and then the program creates a new text file.
Thanks in advance! 
What do you want to do exactly? It's too vague.
Have you tried using a text editor or microsoft excel or well, anything? 
Quote:
I used Microsoft Excel to sort in ascending or descending order...but because of the large number of lines it takes a long time In another way, is there a possibility to find Zvalues from a 3D representation (X, Y, Z) given constant values of X and Y as an iterative matrix? 
If I understand what you mean, Octave and Matlab have sortrows, where you can instruct them to sort the rows of a matrix according to the columns of your choice in the order of your choice. Then you can write the output back to a txt file in the new order.

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