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# Thread: What is Rotational Matrix?

1. ## What is Rotational Matrix?

Hi,
Can anyone tell me what is rotational matrix?
I only know that we use rotational matrix when we are having a large number of test cases but time is limited.
So Rotational Matrix help us to cover all the test cases in a limited amount of time.
But i don't know the working explanation of rotational matrix.

2. ## Re: What is Rotational Matrix?

Helo,
Can any one give me some description of "Rotational Matrix".
Looking Forward

Bye

3. ## Re: What is Rotational Matrix?

Abhi,

I am not sure where the term comes from. There are a number of algorithms to optimize possible script combinations, such as All-Pairs, but none that come to mind based on rotational matrix. In the all-pairs model you minimize the number of test scripts required to cover combinations, not to cover all test cases in a limited time, but to cover a representative subset so that we feel the coverage is adequate while we cut back on the number of test cases. Maybe that is what you mean by covering all test cases in a limited amount of time. All-pairs is covered elsewhere in the forum with a reference to a sample download.

If this is not the answer you are looking for you may perhaps be able to clarify what other aspects of the rotational matrix come to mind. Perhaps it will trigger an "aha" moment.

4. ## Re: What is Rotational Matrix?

Frit,

Thanks for your kind concern. Let me clarify more about Rotational Matrix. I dont know exactly but in Rotational Matrix we use variables like R1, R2, R4, R8 and R12.
Keeping these variable we prepare the subset of test cases. And thus somehow complete the execution of test cases.
Now does it trigger any "aha" moment in your mind.
Please explain me the process if you can.
Also plese tell me "All-Pairs" algo.

Thanks and Regards,

5. ## Re: What is Rotational Matrix?

Abhi,

Other than in vector graphics I cannot come up with another use of rotational matrix, so I guess someone developed a routine and ambushed the name because it sounds good (I am just joking, I have no idea).

One thing you can implicitly be referring to is a technique for combining data into test cases that supposedly let you cover more ground in fewer scripts, which is exactly what All-Pairs does. By the way, a simple search on this site will yield instances of All-Pairs, and another site where it is covered is StickyMinds.

The variables probably refer to row subsets or references, and the actual values will be read in from a table. By making sure that no two tests combine the same reference instances you avoid as much as possible the duplication of tests (there is a slight difficulty that you may need to allow occasional duplication when the source stacks of data for each variable are of a different length, but who wants to split hairs). In theory, you can write a "stupid" version of this by writing logic that checks each newly generated set of inputs against a table of previously generated sets to verify that no 2, 3, or 4 variables already occur with that specific combination of values. There exist a number of freeware versions of All-Pairs that do the trick very efficiently.

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