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Walsh permutation/bit permutation/calc
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|[[Walsh permutation]]; [[Walsh permutation; bit permutation|bit permutation]] [[File:Rdrup.svg|link=]]
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Finite permutations ''p'' and corresponding bit permutations ''P'' are composed in opposite directions:<br>
<math>p_a * p_b * ... = p_x ~~~~ \Leftrightarrow ~~~~ ... * P_b * P_a = P_x</math>
__TOC__

==<math>p_1 * p_8  = p_9 ~~~~ \Leftrightarrow ~~~~ P_8 * P_1 = P_9</math>==

<source lang="matlab">
rowp1=[0 1 0 0;
(contracted; show full)     7
    15
%      The result is P22.
%      P8 before P3 before P1 = P22
</source>



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[[Category:Walsh permutation]]