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Function: gen-walk

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I was looking at the documentation of "gen-walk" function and have a doubt. It is my understanding that the probability of "forward" and probability of "backward" can each range from 0 to 1, but the sum cannot be greater than 1. However, the sum could be less than 1.


So, I think it is not correct to have forward probability as 1 and backward probability as 0.7. This would make the total exceed 1. However, it is OK to have forward probability as 0.3 and backward probability as 0.4. In this case the stationary probability would be 1 - 0.3 - 0.4 = 0.3


Am I correct in my understanding? If this is correct, then there is a mistake in the documentation of the function. There is an example with forward probability as 0.9 and backward probability as 0.3. 


Kindly clarify.




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