kruptof

I am having a bit of a trouble understanding orthogonal array calculation. I am trying to understand the following example given by the lecturer: (not exact words, just what I managed to jot down)

a function that takes 20 inputs of true and false values will have a:

single mode calculation of: 2x20
double mode calculation: (20x(20-1)x2)x4

I think I managed to understand the single mode because there are 2 values and 20 parameters.

I also think I understand some of the double mode. 20x because there are 20 input parameters and the x2 because there are 2 values.

The part i don't understand about the double is 20-1 and x4.

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grumpy

You'll have to ask your lecturer. Your notes are not complete enough to even allow an understanding of your question, let alone give an answer.

Fall Back Son

The only thing that I know about orthogonality is that two vectors are orthogonal if, when multiplied, they equal 0. Lol. Hope that helps. But I doubt it does.

mark

its not only vectors, anything can be orthgonal
orthogonal only means that the objects are at right angles to each other

I searched google came across these websites which may be of help

http://mathworld.wolfram.com/OrthogonalArray.html

http://www.research.att.com/~njas/doc/OA.html