a

[

i

+

j

*

lda

]

for column-major layout and

a

[

j

+

i

*

lda

]

for row-major layout, where

lda

is the leading dimension for the array

. For column-major layout, the upper or lower triangle of the matrix is packed by columns in a one dimensional array. For row-major layout, the upper or lower triangle of the matrix is packed by rows in a one dimensional array.

For column-major layout, columns of the matrix are stored in the corresponding columns of the array, and diagonals of the matrix are stored in a specific row of the array. For row-major layout, rows of the matrix are stored in the corresponding rows of the array, and diagonals of the matrix are stored in a specific column of the array.