INPUT:MATRIX

making_corrections

 To change a previous row, say the n'th row, enter In before the new
 entries. All entries must be present. For example, suppose you are
 creating a matrix, M, with 5 columns and 3 rows. When entering the 3rd
 set of numbers, you realize you have made a mistake in the 2nd set. The
 following shows how you could correct the mistake.

 PHYSICA: INPUT\MATRIX M 3 5
 Enter 5 numbers
 (row  1) >> 1 2 3 4 5
 (row  2) >> 6 7 8 9 10
 (row  3) >> I2 6 7 -8 9 10
 (row  3) >> 11 12 13 14 15
 PHYSICA:

 and you will have the following matrix:
         |  1  2  3  4  5 |
    M =  |  6  7 -8  9 10 |
         | 11 12 13 14 15 |