calculation within a matrix

Consider a matrix with 1877958 rows and 7 columns. How can I subtract the first row, second row, third row... in column 1 from the first row, second row, third row, fourth row..... in column 7 and then divide the result by the first row, second row, third row, fourth row.... of column 3 until all 1877958 rows are covered. I want the result to be displayed as a 8th column.

Answer 1

[Geoff Hayes]

AA - if A is your matrix, then the calculation that you wish to perform could be written as

 B = (A(:,7) - A(:,1))./A(:,3);

Then just append B as your 8th column of A as

 A = [A B];

Try the above and see what happens!