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finding the length of a matrix

finding the length of a matrix

finding the length of a matrix

(OP)
So I'm having troubles with this code.  I am working with a huge text file that contains a nx2 matrix.  Since "n" can be very large, Matlab can not import the entire file due to memory limits.  Therefore, I must import sections of it using 'dlmread'.  However, how will I be able to know the size of this huge matrix?  I can not just read it off the text file by eye.  I need to run a loop to take sections of 100,000 rows at a time, but I must know the number of the last row of the entire matrix to run the loop.  Please help.

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