I have a doubt on how to separate different data from an array. For example: Each matrix has different number of rows and columns. In the first column of each matrix, the numbers 1, 2, and 3 always appear. How can I do to separate the data in a new file ??? containing only the data of the lines that have the number 1, that have the number 2 and that have the number 3 ???
Thanks and grateful for your help!