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perldl> $a = sequence(5)
perldl> $b = pdl [1,4,9,16]
...
[0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0]
# This looks like all the rows of the matrix concatenated.
# And look, the values at 1 and 9 are the only true ones

$c_flat_pos = $c_dim_0_pos + $c_dim_1_pos * $sizeof_c_dim_0

$c_flat_pos = $index_in_a + ($index_in_b * $sizeof_a)