Function pack_b 

pub unsafe fn pack_b<T: TropicalScalar>(
    k: usize,
    n: usize,
    b: *const T,
    ldb: usize,
    layout: Layout,
    trans: Transpose,
    packed: *mut T,
    nr: usize,
)

Pack a panel of matrix B into a contiguous buffer.

The packed format stores nc columns in row-major order within blocks of nr columns.

Layout

For B with dimensions k×n:

Original B (row-major, k=3, n=6, nr=4):
[ b00 b01 b02 b03 b04 b05 ]
[ b10 b11 b12 b13 b14 b15 ]
[ b20 b21 b22 b23 b24 b25 ]

Packed (row-major within k×nr blocks):
Block 0 (cols 0-3): b00 b01 b02 b03 | b10 b11 b12 b13 | b20 b21 b22 b23
Block 1 (cols 4-5): b04 b05 0   0   | b14 b15 0   0   | b24 b25 0   0

Safety

• b must point to valid memory for at least k * ldb or ldb * n elements
• packed must have capacity for at least ((n + nr - 1) / nr) * nr * k elements