x11: | value to use at first line and first column of the matrix. |
x12: | value to use at first line and second column of the matrix. |
x13: | value to use at first line and third column of the matrix. |
x21: | value to use at second line and first column of the matrix. |
x22: | value to use at second line and second column of the matrix. |
x23: | value to use at second line and third column of the matrix. |
x31: | value to use at third line and first column of the matrix. |
x32: | value to use at third line and second column of the matrix. |
x33: | value to use at third line and third column of the matrix. |